From eoas-seminar at lists.fsu.edu Fri Nov 1 08:48:14 2019 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Fri, 1 Nov 2019 12:48:14 +0000 Subject: [Eoas-seminar] REMINDER TODAY: Re: EOAS Colloquium Nov 1: Isla Simpson (NCAR) In-Reply-To: References: Message-ID: Reminder seminar today: Dear all, This is a reminder that our next EOAS Colloquium is next Friday November 1, at 3:30 PM in CAR 101. Our speaker will be Dr. Isla Simpson. Dr. Simpson is a scientist in the Climate and Global Dynamics Division at the National Center for Atmospheric Research (NCAR) and she will be speaking about: Multi-decadal variability in the North Atlantic jet stream, its connection to ocean variability and the implications for decadal prediction (abstract below) Please contact Allison Wing (awing at fsu.edu) to schedule a meeting with Dr. Simpson. She studies large-scale atmospheric dynamics and its representation in global climate models. She is particularly interested in understanding the variability and change of the large-scale circulation and its impacts on regional climate and hydroclimate. Her website is: http://www.cgd.ucar.edu/staff/islas/index.html We look forward to seeing you there! Title: Multi-decadal variability in the North Atlantic jet stream, its connection to ocean variability and the implications for decadal prediction. Abstract: The characteristics of the North Atlantic jet stream play a key role in the weather and climate of western Europe. While much of the year to year variability in the jet stream arises from internal atmospheric processes that are inherently unpredictable on timescales beyond a few days to weeks, any low frequency variability that can be considered forced by slowly varying boundary conditions, offers the potential for extended range predictability of climatological conditions in western Europe. Here it will be demonstrated that over the historical record, the North Atlantic jet stream has displayed pronounced multi-decadal variability in the late winter with implications for precipitation in western Europe. This jet stream variability far exceeds that found in state-of-the-art climate models and far exceeds expectations from the sampling of atmospheric noise. It is found that over the observational record there is a strong connection between Sea Surface Temperature (SST) variability and jet stream variability in the North Atlantic and that this connection appears to be absent in models. Nevertheless, given that models can predict SST variability at long lead time, the observed SST-jet stream-precipitation relationship combined with model predicted SST variability offers the potential for extended range predictability of low frequency precipitation variability in western Europe. ?????????????????? Allison Wing, Ph.D. Assistant Professor Earth, Ocean and Atmospheric Science Florida State University awing at fsu.edu _______________________________________________ Eoas-seminar mailing list Eoas-seminar at lists.fsu.edu https://lists.fsu.edu/mailman/listinfo/eoas-seminar -------------- next part -------------- An HTML attachment was scrubbed... URL: From eoas-seminar at lists.fsu.edu Fri Nov 1 09:46:12 2019 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Fri, 1 Nov 2019 13:46:12 +0000 Subject: [Eoas-seminar] Meteorology PhD defense for Levi Cowan, November 1, 2:00 PM, Love 353 Message-ID: Meteorology Seminar Levi Cowan PhD Meteorology Candidate Title: ATLANTIC TROPICAL CYCLONE INTERACTIONS WITH UPPER TROPOSPHERIC TROUGHS AND JETS: IDENTIFICATION, CLIMATOLOGY, AND MODULATION OF TROPICAL CYCLONE INTENSITY Major Professor: Dr. Robert Hart Date: November 1, 2019 Time: 2:00 PM Location: Werner A. Baum Seminar Room (353 Love Building) (Please join us for refreshments served outside room 353 Love @ 1:30 PM) ABSTRACT Interactions of Atlantic tropical cyclones (TCs) with upper tropospheric flow are identified in 37 years of ERA-Interim reanalysis data and analyzed from multiple perspectives. Upper tropospheric troughs are identified in a more comprehensive way than past methodologies, targeting features on the dynamic tropopause to reduce exclusivity of feature selection and sensitivity to the background environment. As a unique way of characterizing and subsetting environmental flow, upper tropospheric jets are identified in 200-hPa wind fields within 3000 km of TCs using a robust, objective algorithm. The climatology of the resulting dataset of jet axes is explored through various means, including an objective clustering technique, which yielded seven statistically distinct groups of jets associated with recognizable flow patterns near TCs. The mean impact of TC outflow on adjacent jets is also quantified, with along-jet acceleration downstream of the TC found to be nearly ubiquitous across the Atlantic basin, though modulated strongly by the geographically varying background state. The influence of nearby upper tropospheric troughs and jets on TC intensity is also assessed through a variety of approaches. In order to minimize systematic sampling biases when quantifying this impact, a spatially varying climatology of TC intensification rate is developed using a second-order, generalized least squares regression model, allowing TC intensity responses to external forcing to be evaluated as departures from their expected value. Both troughs and jets are found to be net negative influences on TC intensity, on average, primarily due to increasing vertical shear with proximity to the vortex. Differences between rapidly intensifying (RI) and rapidly weakening (RW) cases during TC-trough-jet interactions depend not only on shear, but on dynamic forcing imposed by baroclinic processes and eddy momentum fluxes that can counter the influence of shear. Intensifying cases are primarily associated with jets that approach the poleward side of the TC and possess entrance regions that amplify over time, increasing dynamic forcing for ascent near the TC core while maintaining enough distance to prevent shear from overwhelming those effects. This study expands the set of tools for analyzing TC interactions with upper tropospheric flow by improving trough identification and introducing a new perspective through the use of jets. Jets afford greater specificity in describing environmental flow, and allow unique methods of quantifying its impact on TCs. A close relationship is found between jet proximity and vertical shear, as well as jet acceleration and dynamically-forced ascent. Some measures of jet entrance region orientation correlate with the relative magnitude of these influences. Prior research has tended to evaluate such influences individually or relied on case studies to elucidate their collective impact on a single storm. This body of work seeks to illuminate relationships between TCs and upper tropospheric flow that are robust across large samples of TCs and storm environments, utilizing novel approaches such as the jet perspective to extract previously unquantified information. Shel McGuire Florida State University Academic Program Specialist Department of Earth, Ocean, & Atmospheric Science 1017 Academic Way, 410 Love Building (Meteorology) Tallahassee, FL 32306 850-644-8582 -------------- next part -------------- An HTML attachment was scrubbed... URL: From eoas-seminar at lists.fsu.edu Fri Nov 1 09:46:46 2019 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Fri, 1 Nov 2019 13:46:46 +0000 Subject: [Eoas-seminar] Meteorology PhD Defense for Jason Ducker, November 4, 1:00 PM, Love 353 Message-ID: Meteorology Seminar Jason Ducker PhD Meteorology Candidate Title: Developing new datasets to evaluate tropospheric photochemistry and the effects of ozone uptake in the biosphere Major Professor: Dr. Christopher Holmes Date: November 4, 2019 Time: 1:00 PM Location: Werner A. Baum Seminar Room (353 Love Building) (Please join us for refreshments served outside room 353 Love @ 12:30 PM) ABSTRACT In the presence of water vapor, photolysis of tropospheric ozone (O3) produces the hydroxyl radical (OH), which is a strong oxidant that directly and indirectly controls a host of greenhouse gases and air pollutants. When tropospheric O3 reaches the surface, its oxidative effects perturb plant transpiration and photosynthesis. Although these effects have been included in climate and air quality models, there are limited observational datasets to constrain key aspects of atmospheric photochemistry and O3 deposition on regional to global scales. This dissertation develops and uses two new datasets to better understand the ozone photochemistry and impacts. Photolysis, the breaking of chemical bonds by sunlight, is the engine for reactive atmospheric chemistry. It controls production of atmopsheric oxidants, especially O3 and OH, which then influence the lifetimes of other air pollutants and climate forcing agents. Global chemistry and climate models differ in their estimates of these photolysis rates and there hasnt been datasets capable of discriminating amongst different models. Here, we integrate satellite-retrivals of clouds and aerosols into a photolysis code and produce a 3-D global photolysis dataset called Sat-J. We show that Sat-J is tightly correlated with in-situ measurements of photolysis rates from airborne chemistry campaigns, with errors (4-20%) mainly attributed to differences in cloud sampling and surface albedo characteristics. By comparing regional, not necessarily collocated, averages of aircraft data, SatJ, and a chemistry model (GEOS-Chem); we demonstrate that SatJ provides a representative climatology of photolysis rates across the globe and can serve as a benchmark for photochemistry models. Using surface micrometeorological fluxes and surface O3 monitoring networks, we also develop and evaluate a method to estimate O3 deposition and stomatal O3 uptake across networks of eddy covariance flux tower sites where O3 concentrations and O3 fluxes have not been measured. This method, called SynFlux, reproduces the variability in daily stomatal O3 uptake at sites with O3 flux measurements, with a modest bias (21% or less) attributed to gridded O3 concentrations. Across SynFlux sites, we highlight environmental factors controlling spatial patterns in O3 deposition and showed that previous O3 concentration-based metrics for plant damages did not correlate with SynFlux O3 uptake, which is a better predictor for plant damage than ambient concentration in air. SynFlux has dramatically expanded the available data on surface O3 deposition, which can now be used for performing ecosystem impact studies across a species and climates in the US and Europe. Past controlled experiments involving single plant species have shown that O3 uptake can degrade water-use efficiency (WUE), which is the ratio of carbon uptake in photosynthesis (GPP) to water loss in plant transpiration (T). Using SynFlux sites, we can quantify this effect for whole ecosystems under natural environmental variability, which has not been previously studied. Across 74 SynFlux sites, we find a significant negative relationship (-0.02% per [cid:image001.png at 01D59099.458BBF00] mol m-2 d-1) between daily cumulative O3 uptake (CUO) and WUE anomalies, with the largest impacts occurring at forest sites. Past controlled studies of selected individual species also observed a similar O3 reduction of WUE over the growing season, indicating a consistent response to O3 across multiple species with an ecosystem. When we analyze the relationships between daily CUO and GPP or T anomalies, we also find that CUO degrades GPP and increases T over the growing season. We postulate that O3 degrades WUE through O3 non-stomatal biochemical factors, which result in a reduction of GPP or an increase in T. Our SynFlux results here provide climate models the ability to incorporate O3-dose response relationships between O3 uptake and ecosystem carbon and water vapor fluxes across ecosystems that have not previously been studied. Shel McGuire Florida State University Academic Program Specialist Department of Earth, Ocean, & Atmospheric Science 1017 Academic Way, 410 Love Building (Meteorology) Tallahassee, FL 32306 850-644-8582 -------------- next part -------------- An HTML attachment was scrubbed... URL: -------------- next part -------------- A non-text attachment was scrubbed... Name: image001.png Type: image/png Size: 301 bytes Desc: image001.png URL: From eoas-seminar at lists.fsu.edu Fri Nov 1 12:48:47 2019 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Fri, 1 Nov 2019 16:48:47 +0000 Subject: [Eoas-seminar] Room change: Dr. Julia Sigwart Seminar, Nov. 4th, 4 pm, King 1024 In-Reply-To: References: Message-ID: Room change: The Sigwart seminar on Monday was moved to room King 1024 The updated announcement is attached. Have a great weekend, Markus Markus Huettel Department of Earth, Ocean and Atmospheric Science Florida State University 117 N Woodward Ave. P.O. Box 3064320 Tallahassee, Florida 32306-4320 USA Phone: (850) 645-1394 Fax: (850) 644-2581 Email: mhuettel at fsu.edu Website: http://myweb.fsu.edu/mhuettel/ ________________________________________ From: Markus Huettel Sent: Thursday, October 31, 2019 5:02 PM To: eoas-seminar at lists.fsu.edu Subject: Dr. Julia Sigwart Seminar, Nov. 4th, 4 pm, King 2057 Please join us for the seminar of Dr. Julia Sigwart titled: What species mean: A user's guide to the units of biodiversity Monday, Nov. 4th, 4 pm, King 2057 More information on Dr. Sigwart and her presentation is available on the attached announcement. Markus Huettel Department of Earth, Ocean and Atmospheric Science Florida State University 117 N Woodward Ave. P.O. Box 3064320 Tallahassee, Florida 32306-4320 USA Phone: (850) 645-1394 Fax: (850) 644-2581 Email: mhuettel at fsu.edu Website: http://myweb.fsu.edu/mhuettel/ -------------- next part -------------- A non-text attachment was scrubbed... Name: Sigwart.pdf Type: application/pdf Size: 941331 bytes Desc: Sigwart.pdf URL: From eoas-seminar at lists.fsu.edu Mon Nov 4 08:15:21 2019 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Mon, 4 Nov 2019 13:15:21 +0000 Subject: [Eoas-seminar] Today: Dr. Julia Sigwart Seminar, 4 pm, King 1024 In-Reply-To: References: , Message-ID: Please join us today for the seminar by Dr. Julia Sigwart What species mean: A user's guide to the units of biodiversity Nov. 4th, 4 pm, King 1024 More information on Dr. Sigwart and her presentation is available on the attached announcement. Markus Huettel Department of Earth, Ocean and Atmospheric Science Florida State University 117 N Woodward Ave. P.O. Box 3064320 Tallahassee, Florida 32306-4320 USA Phone: (850) 645-1394 Fax: (850) 644-2581 Email: mhuettel at fsu.edu Website: http://myweb.fsu.edu/mhuettel/ ________________________________________ From: Markus Huettel Sent: Friday, November 1, 2019 12:48 PM To: eoas-seminar at lists.fsu.edu Subject: Room change: Dr. Julia Sigwart Seminar, Nov. 4th, 4 pm, King 1024 Room change: The Sigwart seminar on Monday was moved to room King 1024 The updated announcement is attached. Have a great weekend, Markus Markus Huettel Department of Earth, Ocean and Atmospheric Science Florida State University 117 N Woodward Ave. P.O. Box 3064320 Tallahassee, Florida 32306-4320 USA Phone: (850) 645-1394 Fax: (850) 644-2581 Email: mhuettel at fsu.edu Website: http://myweb.fsu.edu/mhuettel/ ________________________________________ From: Markus Huettel Sent: Thursday, October 31, 2019 5:02 PM To: eoas-seminar at lists.fsu.edu Subject: Dr. Julia Sigwart Seminar, Nov. 4th, 4 pm, King 2057 Please join us for the seminar of Dr. Julia Sigwart titled: What species mean: A user's guide to the units of biodiversity Monday, Nov. 4th, 4 pm, King 2057 More information on Dr. Sigwart and her presentation is available on the attached announcement. Markus Huettel Department of Earth, Ocean and Atmospheric Science Florida State University 117 N Woodward Ave. P.O. Box 3064320 Tallahassee, Florida 32306-4320 USA Phone: (850) 645-1394 Fax: (850) 644-2581 Email: mhuettel at fsu.edu Website: http://myweb.fsu.edu/mhuettel/ -------------- next part -------------- A non-text attachment was scrubbed... Name: Sigwart.pdf Type: application/pdf Size: 941331 bytes Desc: Sigwart.pdf URL: From eoas-seminar at lists.fsu.edu Mon Nov 4 09:09:01 2019 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Mon, 4 Nov 2019 14:09:01 +0000 Subject: [Eoas-seminar] EOAS Colloquiuqm Speaker Fri Nov 8 3:30 Car 101 In-Reply-To: References: Message-ID: This week's EOAS Colloquium seminar on Friday at 3:30 in CAR 101 will be given by: Dr. Alyssa Atwood of EOAS at FSU Is the concept of a zonally-averaged tropical precipitation change useful? The response of the tropical atmosphere to forcing has been extensively studied through the lens of an energetic theory relating the zonal mean Hadley circulation to atmospheric energy transport across the equator. While this framework is useful for developing a conceptual understanding of the tropical atmosphere?s response to natural and anthropogenic forcing, by construction it averages out the rich zonal nature of atmospheric circulation and rainfall patterns, which reflect the distinct processes that govern large-scale precipitation in different regions of the tropics. In this talk, I will draw upon a large suite of future and paleoclimate model simulations to show that the zonal mean framework is generally not useful for characterizing shifts of the tropical rain belt at regional scales?regardless of the characteristics of the climate forcing. Under forcings with strong hemispheric asymmetry, the zonal mean shift is robust across models but the direction and magnitude of the shift varies strongly as a function of longitude. Under forcings with weak hemispheric asymmetry, zonal mean shifts are small or absent, but large regional shifts can occur that have important dynamical consequences. In addition, the precipitation response is highly sensitive to tropical mean state biases in models, highlighting an important caveat to interpreting rainfall changes from model simulations with poor representation of tropical rainfall climatology. I will discuss the implications of these findings for interpreting changes in the tropical rain belt from paleoclimate proxy records. -------------- next part -------------- An HTML attachment was scrubbed... URL: From eoas-seminar at lists.fsu.edu Mon Nov 4 09:16:59 2019 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Mon, 4 Nov 2019 14:16:59 +0000 Subject: [Eoas-seminar] MET seminar, Thursday, Nov. 7 @3:30 PM Message-ID: Hi all, Please notice that Dr. Nirupam Karmakar will be this week's speaker in the MET seminar series (Thursday, 3:30 PM @ LOV 353). Please see the attached flyer to find his talk title and abstract. Look forward to meeting you at the time. Cheers, Zhaohua -------------- next part -------------- An HTML attachment was scrubbed... URL: -------------- next part -------------- A non-text attachment was scrubbed... Name: MET_Seminar_Flyer_Karmakar.pdf Type: application/pdf Size: 963756 bytes Desc: MET_Seminar_Flyer_Karmakar.pdf URL: From eoas-seminar at lists.fsu.edu Mon Nov 4 20:30:19 2019 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Tue, 5 Nov 2019 01:30:19 +0000 Subject: [Eoas-seminar] Geology Thesis Defense - Chance Hannold - Nov 14, 3:00p - 104CAR Message-ID: Title: Isotopic Evidence for Diets and Environments of Late Miocene-Early Pliocene Mammals in Yepomera, Mexico Major Professor: Yang Wang -------------- next part -------------- An HTML attachment was scrubbed... URL: From eoas-seminar at lists.fsu.edu Tue Nov 5 09:18:28 2019 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Tue, 5 Nov 2019 14:18:28 +0000 Subject: [Eoas-seminar] Biogeochemistry Seminar Nov. 11, 2019, Rm. 327 OSB 12:15-13:15 Message-ID: Biogeochemistry Seminar Nov. 11, 2019 Rm. 327 OSB 12:15-13:15 Speaker: Zhou Liang Title: Dissolved Organic Phosphorus (DOP) Distributions in the Eastern Indian Ocean and Subtropical South Pacific Ocean Abstract: Significant rates of export production and nitrogen fixation occur in oligotrophic gyres in spite of low inorganic nutrient concentrations in surface waters. Prior work suggests that dissolved organic nitrogen (DON) and dissolved organic phosphorus (DOP) are important nutrient sources when inorganic nutrients are scarce. In particular, DOP has been shown to be an important P source for diazotrophs who may be better suited to using low concentrations of organic vs. inorganic P. Prior modeling work has also suggested that DOP dominating the P pool in the euphotic zone is important for supporting export production in oligotrophic gyres. However, validation of such models is limited by the number of upper ocean DOP concentration measurements, especially in the South Pacific and Indian Oceans. Here, we present measurements of DOP concentration from the 2016 GO-SHIP I08S and I09N meridional transect in Eastern Indian Ocean, and DON and DOP concentration measurements from the 2017 GO-SHIP P06 zonal transect in the South Pacific Subtropical Gyre (SPSG). Together with DOC and DON concentration measurements from prior occupations of the same GO-SHIP lines we evaluated changes of DOC: DON: DOP concentration ratio stoichiometry in euphotic zone across these two transects to infer regions of preferential DON and/or DOP production and consumption. Specifically, DOC and DOP accumulate in the eastern part of SPSG, but a significant increase in DOC to DOP concentration ratio in euphotic zone from 225: 1 to 493: 1 from east to the core of gyre on west is observed. In the Eastern Indian Ocean, DOP concentration in euphotic zone is high in equatorial region and Southern Ocean but low in Bay of Bengal and subtropical gyre. DOC to DOP concentration ratio in the euphotic zone increases from 159: 1 to 192:1 from equatorial region to the gyre and then decreases to 120: 1 in the Southern Ocean. Also, a similar trend for DOC to DON concentration ratio in the euphotic zone along the Eastern Indian Ocean meridional transect is observed. These stoichiometric shifts in upper ocean DOC: DON: DOP ratios are considered in the context of ocean circulation and upwelling and downwelling patterns in the Indian Ocean and SPSG, phosphate stress, as well as prior observations of the distribution of nitrogen fixation, especially in the western tropical South Pacific. From eoas-seminar at lists.fsu.edu Tue Nov 5 09:30:11 2019 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Tue, 5 Nov 2019 14:30:11 +0000 Subject: [Eoas-seminar] ERROR: Biogeochemistry Seminar Nov. 8, 2019 Rm 327 OSB 12:15-13:15 Message-ID: Biogeochemistry Seminar Nov. 8, 2019 Rm. 327 OSB 12:15-13:15 Speaker: Zhou Liang Title: Dissolved Organic Phosphorus (DOP) Distributions in the Eastern Indian Ocean and Subtropical South Pacific Ocean Abstract: Significant rates of export production and nitrogen fixation occur in oligotrophic gyres in spite of low inorganic nutrient concentrations in surface waters. Prior work suggests that dissolved organic nitrogen (DON) and dissolved organic phosphorus (DOP) are important nutrient sources when inorganic nutrients are scarce. In particular, DOP has been shown to be an important P source for diazotrophs who may be better suited to using low concentrations of organic vs. inorganic P. Prior modeling work has also suggested that DOP dominating the P pool in the euphotic zone is important for supporting export production in oligotrophic gyres. However, validation of such models is limited by the number of upper ocean DOP concentration measurements, especially in the South Pacific and Indian Oceans. Here, we present measurements of DOP concentration from the 2016 GO-SHIP I08S and I09N meridional transect in Eastern Indian Ocean, and DON and DOP concentration measurements from the 2017 GO-SHIP P06 zonal transect in the South Pacific Subtropical Gyre (SPSG). Together with DOC and DON concentration measurements from prior occupations of the same GO-SHIP lines we evaluated changes of DOC: DON: DOP concentration ratio stoichiometry in euphotic zone across these two transects to infer regions of preferential DON and/or DOP production and consumption. Specifically, DOC and DOP accumulate in the eastern part of SPSG, but a significant increase in DOC to DOP concentration ratio in euphotic zone from 225: 1 to 493: 1 from east to the core of gyre on west is observed. In the Eastern Indian Ocean, DOP concentration in euphotic zone is high in equatorial region and Southern Ocean but low in Bay of Bengal and subtropical gyre. DOC to DOP concentration ratio in the euphotic zone increases from 159: 1 to 192:1 from equatorial region to the gyre and then decreases to 120: 1 in the Southern Ocean. Also, a similar trend for DOC to DON concentration ratio in the euphotic zone along the Eastern Indian Ocean meridional transect is observed. These stoichiometric shifts in upper ocean DOC: DON: DOP ratios are considered in the context of ocean circulation and upwelling and downwelling patterns in the Indian Ocean and SPSG, phosphate stress, as well as prior observations of the distribution of nitrogen fixation, especially in the western tropical South Pacific. ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ William M. Landing, Ph.D. Department of Earth, Ocean, and Atmospheric Science Florida State University 117 N. Woodward Ave., Tallahassee, FL 32306-4320 850-644-6037; 850-644-2581 FAX wlanding at fsu.edu; http://www.eoas.fsu.edu +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ From eoas-seminar at lists.fsu.edu Thu Nov 7 08:54:28 2019 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Thu, 7 Nov 2019 13:54:28 +0000 Subject: [Eoas-seminar] Fw: MET seminar, Thursday, Nov. 7 @3:30 PM In-Reply-To: References: Message-ID: Hi all, Just a friendly reminder that Dr. Nirupam Karmakar will be the speaker of this afternoon's MET seminar (3:30 PM at LOV 353). The title of his talk is: Characteristics of intraseasonal oscillations in the Indian summer monsoon rainfall See more information of his talk in the attached seminar announcement flyer. Also, the speaker for the next week's MET seminar will be Prof. Allison Wing. The title of her talk is The role of radiative-convective feedbacks in tropical cyclone formation in numerical simulations. The more detailed information can be found in the attached seminar announcement flyer. Please join to enjoy the seminars. Cheers, Zhaohua ________________________________ From: Zhaohua Wu Sent: Monday, November 4, 2019 9:16 AM To: eoas-seminar at lists.fsu.edu ; info at coaps.fsu.edu Subject: MET seminar, Thursday, Nov. 7 @3:30 PM Hi all, Please notice that Dr. Nirupam Karmakar will be this week's speaker in the MET seminar series (Thursday, 3:30 PM @ LOV 353). Please see the attached flyer to find his talk title and abstract. Look forward to meeting you at the time. Cheers, Zhaohua -------------- next part -------------- An HTML attachment was scrubbed... URL: -------------- next part -------------- A non-text attachment was scrubbed... Name: MET_Seminar_Flyer_Karmakar.pdf Type: application/pdf Size: 963756 bytes Desc: MET_Seminar_Flyer_Karmakar.pdf URL: -------------- next part -------------- A non-text attachment was scrubbed... Name: MET_Seminar_Flyer_Wing.pdf Type: application/pdf Size: 975144 bytes Desc: MET_Seminar_Flyer_Wing.pdf URL: From eoas-seminar at lists.fsu.edu Fri Nov 8 12:13:54 2019 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Fri, 8 Nov 2019 17:13:54 +0000 Subject: [Eoas-seminar] REMINDER TODAY Fwd: EOAS Colloquiuqm Speaker Fri Nov 8 3:30 Car 101 In-Reply-To: References: Message-ID: TODAY's EOAS Colloquium seminar at 3:30 in CAR 101 will be given by: Dr. Alyssa Atwood of EOAS at FSU Is the concept of a zonally-averaged tropical precipitation change useful? The response of the tropical atmosphere to forcing has been extensively studied through the lens of an energetic theory relating the zonal mean Hadley circulation to atmospheric energy transport across the equator. While this framework is useful for developing a conceptual understanding of the tropical atmosphere?s response to natural and anthropogenic forcing, by construction it averages out the rich zonal nature of atmospheric circulation and rainfall patterns, which reflect the distinct processes that govern large-scale precipitation in different regions of the tropics. In this talk, I will draw upon a large suite of future and paleoclimate model simulations to show that the zonal mean framework is generally not useful for characterizing shifts of the tropical rain belt at regional scales?regardless of the characteristics of the climate forcing. Under forcings with strong hemispheric asymmetry, the zonal mean shift is robust across models but the direction and magnitude of the shift varies strongly as a function of longitude. Under forcings with weak hemispheric asymmetry, zonal mean shifts are small or absent, but large regional shifts can occur that have important dynamical consequences. In addition, the precipitation response is highly sensitive to tropical mean state biases in models, highlighting an important caveat to interpreting rainfall changes from model simulations with poor representation of tropical rainfall climatology. I will discuss the implications of these findings for interpreting changes in the tropical rain belt from paleoclimate proxy records. -------------- next part -------------- An HTML attachment was scrubbed... URL: From eoas-seminar at lists.fsu.edu Fri Nov 8 12:54:42 2019 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Fri, 8 Nov 2019 17:54:42 +0000 Subject: [Eoas-seminar] =?windows-1252?q?Seminar_by_Dr=2E_Ma=9Eeika_Sulli?= =?windows-1252?q?van_on_Tuesday=2C_November_12th=2C_2=3A00_pm=2C_room=3A_?= =?windows-1252?q?CSL_1003_=28Chemistry_Auditorium=29?= In-Reply-To: References: , , Message-ID: Please join us for the seminar by Dr. Ma?eika Sullivan Ohio State University School of Environment and Natural Resources CONNECTIVITY AND CROSS-SYSTEM LINKAGES IN WATERSHED AND COASTAL ECOSYSTEMS Tuesday, November 12th, 2:00 pm Room: CSL 1003 (Chemistry Auditorium) More information on Dr. Sullivan is available on the attached announcement. Markus Huettel Markus Huettel Department of Earth, Ocean and Atmospheric Science Florida State University 117 N Woodward Ave. P.O. Box 3064320 Tallahassee, Florida 32306-4320 USA Phone: (850) 645-1394 Fax: (850) 644-2581 Email: mhuettel at fsu.edu Website: http://myweb.fsu.edu/mhuettel/ -------------- next part -------------- A non-text attachment was scrubbed... Name: Sullivan Flyer 1.pdf Type: application/pdf Size: 1766483 bytes Desc: Sullivan Flyer 1.pdf URL: From eoas-seminar at lists.fsu.edu Fri Nov 8 16:42:22 2019 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Fri, 8 Nov 2019 21:42:22 +0000 Subject: [Eoas-seminar] No EOAS colloquium 11/15 Message-ID: There will be no Faculty meeting on Fri Nov 15 because there is a faculty meeting. Our last speaker of the semester will be Raj Dasgupta on Fri. Nov 22 From eoas-seminar at lists.fsu.edu Fri Nov 8 16:52:43 2019 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Fri, 8 Nov 2019 16:52:43 -0500 Subject: [Eoas-seminar] No EOAS colloquium 11/15 In-Reply-To: References: Message-ID: Correction, there will be a faculty meeting next Friday 11/15 ------------- Dr. Vincent J.M. Salters Professor and Chair Department of Earth, Ocean and Atmospheric Sciences Labs at: Geochemistry Program of the National High Magnetic Field Laboratory Florida State University Tallahassee, Florida Phone: 850-644-1934, Skype: vsalters > On Nov 8, 2019, at 4:42 PM, eoas-seminar--- via Eoas-seminar wrote: > > There will be no Faculty meeting on Fri Nov 15 because there is a > faculty meeting. > > Our last speaker of the semester will be Raj Dasgupta on Fri. Nov 22 > > > _______________________________________________ > Eoas-seminar mailing list > Eoas-seminar at lists.fsu.edu > https://lists.fsu.edu/mailman/listinfo/eoas-seminar -------------- next part -------------- An HTML attachment was scrubbed... URL: From eoas-seminar at lists.fsu.edu Tue Nov 12 14:04:21 2019 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Tue, 12 Nov 2019 19:04:21 +0000 Subject: [Eoas-seminar] =?utf-8?q?REMINDER=3A_COAPS_SEMINAR=3A_=E2=80=9CS?= =?utf-8?q?eeding_snow=3A_Mississippi_River_plume_interaction_with_surface?= =?utf-8?q?_oil_in_the_northern_Gulf_of_Mexico=E2=80=9D_by_Catherine_Edwar?= =?utf-8?q?ds_-_November_13_at_3pm?= In-Reply-To: References: Message-ID: -------- Forwarded Message -------- Subject: COAPS SEMINAR: ?Seeding snow: Mississippi River plume interaction with surface oil in the northern Gulf of Mexico? by Catherine Edwards - November 13 at 3pm Date: Wed, 30 Oct 2019 10:28:59 -0400 From: Eric Chassignet To: seminar at coaps.fsu.edu, eoas-seminar at lists.fsu.edu Dr. Catherine Edwards Skidaway Institute of Oceanography University of Georgia ?Seeding snow: Mississippi River plume interaction with surface oil in the northern Gulf of Mexico? Wednesday, November 13 - 3:00 pm COAPS seminar room 255, Research Building A Directions: https://www.coaps.fsu.edu/about-us/visitor-information Abstract: Glider data collected in the upper 200 m during a month-long mission in the northern Gulf of Mexico indicate formation of marine oil snow (MOS) after the arrival of fresh river plume water over the continental slope site approximately 200 nm offshore. The putative MOS signal, captured near Green Canyon lease block 600 (GC600), appears in the fluorescence data as large particles with high concentration of both colored dissolved organic matter (CDOM) and chlorophyll-a fluorescence, extending well below the photic zone to at least 190 m depth. Closer examination of the time series suggests a strong diel cycle in concentration of MOS aggregates, with distribution through the upper 190 m during the day and zero signal between local sundown and sunrise. ADCP backscatter from a nearby ship shows diel vertical migration of scatterers of approximately 800 ?m in radius. The size and behavior of the scatterers is consistent with mesozooplankton. Direct measurement of MOS concentration or zooplankton population was not possible with this data set; however, the data are consistent with MOS formation under a fresh water plume, with diel clearing of the aggregates each night by zooplankton grazing. The implications for this previously unknown process of MOS formation and zooplankton-mediated export are explored with respect to system dynamics of natural seeps and the anomalous nature of the 2015 fresh water event. -- Eric Chassignet Professor and Director Center for Ocean-Atmospheric Prediction Studies (COAPS) Florida State University 2000 Levy Avenue, Building A, Suite 292 P.O. Box 3062741 Tallahassee, FL 32306-2741 Office : (1) 850-645-7288 COAPS : (1) 850-644-3846 Cell : (1) 850-524-0033 (urgent matters only) FAX : (1) 850-644-4841 E-mail : echassignet at fsu.edu http://www.coaps.fsu.edu -- Eric Chassignet Professor and Director Center for Ocean-Atmospheric Prediction Studies (COAPS) Florida State University 2000 Levy Avenue, Building A, Suite 292 P.O. Box 3062741 Tallahassee, FL 32306-2741 Office : (1) 850-645-7288 COAPS : (1) 850-644-3846 Cell : (1) 850-524-0033 (urgent matters only) FAX : (1) 850-644-4841 E-mail : echassignet at fsu.edu http://www.coaps.fsu.edu -------------- next part -------------- An HTML attachment was scrubbed... URL: From eoas-seminar at lists.fsu.edu Thu Nov 14 08:44:43 2019 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Thu, 14 Nov 2019 08:44:43 -0500 Subject: [Eoas-seminar] REMINDER TODAY: Fwd: Geology Thesis Defense - Chance Hannold - Nov 14, 3:00pm - 104CAR References: Message-ID: Begin forwarded message: > From: eoas-seminar--- via Eoas-seminar > Subject: [Eoas-seminar] Geology Thesis Defense - Chance Hannold - Nov 14, 3:00p - 104CAR > Date: November 4, 2019 at 8:30:19 PM EST > To: "eoas-seminar at lists.fsu.edu" > Reply-To: eoas-seminar at lists.fsu.edu > > Title: Isotopic Evidence for Diets and Environments of Late Miocene-Early Pliocene Mammals in Yepomera, Mexico > Major Professor: Yang Wang > > _______________________________________________ > Abstract The Late Miocene brought a sudden increase in the biomass of C4 plants that resulted in an expansion of grassland habitat and markedly changed the diets of vertebrate fauna in many places around the world. Concurrently, early pulses of Great American Biotic Interchange (GABI) migrations are evidenced by early first appearances of immigrant taxa in the fossil record, leading into the major GABI pulses in the Early Pliocene. The causes and environmental context of GABI migrations, however, are not well understood. Vertebrate fossils from Yep?mera, western Chihuahua, represent one of the richest assemblages in Mexico and are a valuable paleo-environmental archive. This study examined the stable isotope compositions of tooth enamel samples of this fauna to provide broad insight into the environmental conditions of this region between 4.89 to 5.23 Ma, just after the arrival of C4 plants in North and South America and before the first major migration of GABI. The enamel carbon and oxygen isotope data suggest a relatively dry, open habitat (similar to savanna or prairie environments) with a strong C4 vegetation component, a mean annual temperature of 18 ? 10?C and a moderate annual precipitation of 657 ? 93 mm/yr. At Yep?mera, there was distinct niche partitioning into pure C3 diets, mixed diets, and pure C4 diets. As such, C4 vegetation must have been a major component of the environment during the Late Miocene-Early Pliocene. Despite expectations, no niche partitioning between equid species (Dinohippus mexicanus, Nannippus aztecus, Astrohippus stockii, and Neohipparion eurystyle) can be determined from carbon isotope ratios. All four fossil horse species found in Yep?mera had pure or nearly pure C4 diets, suggesting that they were hyper grazers or primarily grazers, consistent with the inference from their dental morphology. Pure C3 consumption was rare to absent in all other genera analyzed except for the genus Camelops, for which C3 vegetation was the dominant diet. Samples from Hemiauchenia varied between pure C3 diet and a mixed diet depending on the individual. The other genera in this study site (Gomphotheriidae, Hexobelomeryx fricki, and Platygonus) were primarily mixed feeders. Assuming a carnivorous life habit (based on dentition), Agriotherium schneideri, an immigrant large ursid, appears to have consumed primarily equids. However, the enamel isotope data cannot exclude the possibility of an omnivorous life habit. Migrations are evidenced in the oxygen isotope ratios of several specimens indicating that there was mobility in these taxa before the GABI, with diets remaining consistent throughout this migration (suggesting strong dietary preferences and niche specialization). The carbon and oxygen isotope ratios of the Yep?mera fauna are consistent with both the holding pen hypothesis for the GABI and a Central American rise in C4 biomass at least close in time to the expansion of C4 biomass in North America. Through adaptation to this ecosystem, these taxa would be well prepared to exploit and compete for the grassland habitats proposed to have developed on the Panama Isthmus. This could explain how equids, peccaries, gomphotheres, and short-faced bears related to these taxa had such success in arriving and diversifying in the South American mainland, where a similar habitat is believed to have expanded around the time of the exchange. Future work in this area will lead to a more complete understanding of biologic responses to changing climate and population dynamics.------------------------------------------------------------------------------------------------------------------------------------------------ Yang Wang Professor Department of Earth, Ocean and Atmospheric Science Florida State University 909 Antarctica Way PO Box 3064100 Tallahassee, FL 32306 Phone: 850-644-1121 or 850-645-5619 http://www.eoas.fsu.edu/people/faculty/dr-yang-wang http://www.eoas.fsu.edu Google Scholar: http://scholar.google.com/citations?user=uN9mVUoAAAAJ&hl=en Geochemistry Program National High Magnetic Field Laboratory 1800 E Paul Dirac Drive Tallahassee, FL 32310-3706 Phone: 850-644-1121 Fax: 850-644-0827 Office: B327 E-mail: ywang at magnet.fsu.edu -------------- next part -------------- An HTML attachment was scrubbed... URL: From eoas-seminar at lists.fsu.edu Thu Nov 14 10:23:18 2019 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Thu, 14 Nov 2019 15:23:18 +0000 Subject: [Eoas-seminar] MET seminar, Nov. 14 (3:30 PM at LOV 353) Message-ID: Hi all, Just a friendly reminder that Prof. Allison Wing will be the speaker of this afternoon's MET seminar (3:30 PM at LOV 353). The title of her talk is: The role of radiative-convective feedbacks in tropical cyclone formation in numerical simulations. The more detailed information can be found in the attached seminar announcement flyer. Please join to enjoy the seminars. Also, the speaker for the next week's MET seminar (Nov. 21) will be Mr. Robert West. The title of his talk is Non-Gaussian climate variability within a stochastic framework Cheers, Zhaohua -------------- next part -------------- An HTML attachment was scrubbed... URL: -------------- next part -------------- A non-text attachment was scrubbed... Name: MET_Seminar_Flyer_Wing.pdf Type: application/pdf Size: 975144 bytes Desc: MET_Seminar_Flyer_Wing.pdf URL: From eoas-seminar at lists.fsu.edu Thu Nov 14 10:56:10 2019 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Thu, 14 Nov 2019 15:56:10 +0000 Subject: [Eoas-seminar] Fw: MET seminar, Nov. 14 (3:30 PM at LOV 353) In-Reply-To: References: Message-ID: Attached are flyers of seminars given by Prof. Wing and Mr. West. Cheers, Zhaohua ________________________________ From: Zhaohua Wu Sent: Thursday, November 14, 2019 10:23 AM To: eoas-seminar at lists.fsu.edu ; info at coaps.fsu.edu Subject: MET seminar, Nov. 14 (3:30 PM at LOV 353) Hi all, Just a friendly reminder that Prof. Allison Wing will be the speaker of this afternoon's MET seminar (3:30 PM at LOV 353). The title of her talk is: The role of radiative-convective feedbacks in tropical cyclone formation in numerical simulations. The more detailed information can be found in the attached seminar announcement flyer. Please join to enjoy the seminars. Also, the speaker for the next week's MET seminar (Nov. 21) will be Mr. Robert West. The title of his talk is Non-Gaussian climate variability within a stochastic framework Cheers, Zhaohua -------------- next part -------------- An HTML attachment was scrubbed... URL: -------------- next part -------------- A non-text attachment was scrubbed... Name: MET_Seminar_Flyer_Wing.pdf Type: application/pdf Size: 975144 bytes Desc: MET_Seminar_Flyer_Wing.pdf URL: -------------- next part -------------- A non-text attachment was scrubbed... Name: MET_Seminar_Flyer_West.pdf Type: application/pdf Size: 999643 bytes Desc: MET_Seminar_Flyer_West.pdf URL: From eoas-seminar at lists.fsu.edu Thu Nov 14 13:08:36 2019 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Thu, 14 Nov 2019 18:08:36 +0000 Subject: [Eoas-seminar] Seminar by Dr. James W. Fourqurean on Sea turtle overgrazing of sea grasses, Tuesday, November 19, 4:00 pm, room: King 2057 In-Reply-To: References: , , , Message-ID: Please join us for the seminar by Dr. James W. Fourqurean Florida International University "Unintended consequences of marine conservation in the Anthropocene: Sea turtle overgrazing caused the loss of seagrass ecosystems in Bermuda." Tuesday, November 19, 4:00 pm Room: King 2057 More information on Dr. Fourqurean and his seminar is available on the attached announcement. Markus Huettel Markus Huettel Department of Earth, Ocean and Atmospheric Science Florida State University 117 N Woodward Ave. P.O. Box 3064320 Tallahassee, Florida 32306-4320 USA Phone: (850) 645-1394 Fax: (850) 644-2581 Email: mhuettel at fsu.edu Website: http://myweb.fsu.edu/mhuettel/ -------------- next part -------------- A non-text attachment was scrubbed... Name: Fourqurean seminar.pdf Type: application/pdf Size: 2397523 bytes Desc: Fourqurean seminar.pdf URL: From eoas-seminar at lists.fsu.edu Mon Nov 18 08:13:27 2019 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Mon, 18 Nov 2019 13:13:27 +0000 Subject: [Eoas-seminar] EOAS Colloquium speaker this Friday at 3:30 in CAR 101 In-Reply-To: References: Message-ID: Please join us for our last EOAS colloquium speaker of this semester, this Friday Nov 22nd at 3:30 in CAR 101: Dr. Raj Dasgupta from Rice University will present: Origin and Early Differentiation of Life-essential Volatile Elements on Earth Inventory of volatile elements such as carbon, hydrogen, nitrogen, and sulfur in the rocky reservoirs of inner Solar System objects is critical for their possible evolution towards establishing habitable surface conditions. However, the undifferentiated feedstock materials can undergo early differentiation in a number of different ways that lead to significantly different budgets of C, H, N, S in the early silicate reservoirs of various planets, planetary embryos, and planetesimals. In this talk, I will use laboratory experimental constraints on the fate of C, H, N, S during accretion and differentiation (e.g., core formation, atmospheric loss, early mantle melting) of rocky bodies, guided by compositions sampled in our own Solar System. The key parameters we will use are partition coefficients of C, N, S, and H between core forming alloy/sulfide melts and silicate melts, solubility constants of volatile gas species in silicate melts (magma oceans), and P-T-dependent solubility of C and N in core forming alloy melt. I will show how with difference in the conditions of core-mantle fractionation (such as depth, temperature, composition, and redox state of alloy-silicate equilibration) and styles of differentiation such as internal differentiation versus magma ocean, low-temperature sulfide segregation, different planetary silicate reservoirs acquire different inventories of C, H, N, S. I will also evaluate how the volatile abundance pattern involving core-mantle equilibration that may be expected for planets? gradual growth via accretion of undifferentiated planetesimals may differ from those where rocky planets experience punctuated and protracted growth via near-disequilibrium merger of differentiated planetary embryo(s). I will show that Earth's major volatile abundance pattern may be best explained by merger of the proto Earth with a Mars sized body with a sulfur-rich core. -------------- next part -------------- An HTML attachment was scrubbed... URL: From eoas-seminar at lists.fsu.edu Tue Nov 19 07:43:26 2019 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Tue, 19 Nov 2019 12:43:26 +0000 Subject: [Eoas-seminar] Today 4:00 pm: Seminar by Dr. James W. Fourqurean. Location: King 2057 In-Reply-To: References: , , , , Message-ID: Please join us today for the seminar by Dr. James W. Fourqurean Florida International University "Unintended consequences of marine conservation in the Anthropocene: Sea turtle overgrazing caused the loss of seagrass ecosystems in Bermuda." 4:00 pm Room: King 2057 Markus Huettel Department of Earth, Ocean and Atmospheric Science Florida State University 117 N Woodward Ave. P.O. Box 3064320 Tallahassee, Florida 32306-4320 USA Phone: (850) 645-1394 Fax: (850) 644-2581 Email: mhuettel at fsu.edu Website: http://myweb.fsu.edu/mhuettel/ ________________________________________ From: Markus Huettel Sent: Thursday, November 14, 2019 1:08 PM To: eoas-seminar at lists.fsu.edu Cc: Gregory M. Erickson Subject: Seminar by Dr. James W. Fourqurean on Sea turtle overgrazing of sea grasses, Tuesday, November 19, 4:00 pm, room: King 2057 Please join us for the seminar by Dr. James W. Fourqurean Florida International University "Unintended consequences of marine conservation in the Anthropocene: Sea turtle overgrazing caused the loss of seagrass ecosystems in Bermuda." Tuesday, November 19, 4:00 pm Room: King 2057 More information on Dr. Fourqurean and his seminar is available on the attached announcement. Markus Huettel Markus Huettel Department of Earth, Ocean and Atmospheric Science Florida State University 117 N Woodward Ave. P.O. Box 3064320 Tallahassee, Florida 32306-4320 USA Phone: (850) 645-1394 Fax: (850) 644-2581 Email: mhuettel at fsu.edu Website: http://myweb.fsu.edu/mhuettel/ From eoas-seminar at lists.fsu.edu Thu Nov 21 09:08:21 2019 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Thu, 21 Nov 2019 14:08:21 +0000 Subject: [Eoas-seminar] MET seminar by Bobby West at 3:30 PM this afternoon at LOV 353 Message-ID: Hi all, Just a reminder that today there is a MET seminar at 3:30 PM at Lov 353. The speaker will be Bobby West. Attached please find the flyer of his seminar. Best, Zhaohua -------------- next part -------------- An HTML attachment was scrubbed... URL: -------------- next part -------------- A non-text attachment was scrubbed... Name: MET_Seminar_Flyer_West.pdf Type: application/pdf Size: 999643 bytes Desc: MET_Seminar_Flyer_West.pdf URL: From eoas-seminar at lists.fsu.edu Thu Nov 21 11:27:52 2019 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Thu, 21 Nov 2019 16:27:52 +0000 Subject: [Eoas-seminar] Meteorology PhD Defense for Sweta Das, December 5, 2019, 3:30 PM, Love 353 Message-ID: Meteorology Seminar Sweta Das PhD Meteorology Candidate Title: Understanding the evolution of Tropical Cyclones through the streamfunction-velocity potential framework Major Professor: Dr. Vasu Misra Co-Advisor: Dr. Guosheng Liu Date: December 5th, 2019 Time: 3.30 PM Location: Werner A. Baum Seminar Room (353 Love Building) (Please join us for refreshments served outside room 353 Love @ 3:00 PM) ABSTRACT The understanding of the evolution of a Tropical Cyclone (TC) has been a topic of research for several years. During the hurricane season not all thunderstorm events embedded in the African easterly waves or otherwise evolve into organized convection with a closed low pressure system, manifesting into TCs. In this work we suggest that one of the ways to objectively analyze the evolution of the TC is to understand the evolution of the conversion of the available potential energy into kinetic energy on the scale of the disturbance. This study explores the energetics of the interaction between Streamfunction (Psi[cid:image001.png at 01D5A05E.B56CE400])- Velocity Potential (Chi: [cid:image002.png at 01D5A05E.B56CE400] ) in the numerical simulations of the TCs. Using the output of separate 48-hour WRF simulations of three Atlantic TCs: Cindy and Irma of 2017, and Michael 2018, we analyze the time history of the conversion of their kinetic energy from the irrotational to the non-divergent components of the winds. All of these TCs had varied intensities with Cindy being the weakest and Irma being the strongest over the simulation period, which WRF simulated with reasonable fidelity in the evolution of their peak intensities. We show that at 850hPa, the fractional conversion of the kinetic energy from the irrotational to the non-divergent component of the wind increases as the TC intensifies and is higher for the stronger TCs than weaker TCs. Contrastingly, in the outflow level of the TC this transfer of kinetic energy is weaker for stronger TCs than the weaker TCs. Our analysis reveals that when the gradients of the streamfunction and velocity potential are large and oriented parallel to each other both in the large-scale TC environment and in the region of the primary circulation of the TC, then the TC is favored to intensify with robust conversion of the kinetic energy of the irrotational flow[cid:image003.png at 01D5A05E.B56CE400] to kinetic energy of non-divergent flow ([cid:image004.png at 01D5A05E.B56CE400] ) at 850hPa. In contrast, however in the outflow layer, we require a slower conversion of [cid:image005.png at 01D5A05E.B56CE400] to [cid:image004.png at 01D5A05E.B56CE400] for a TC to intensify otherwise it leads to increased inertial instability and weakening of the TC. We arrive at similar conclusions when we contrast the evolution of the tropical cyclones from its genesis to intensifying stages. Likewise, when we examine the sensitivity of the simulations of the tropical cyclones to the choice of microphysics, we find that parameterizations that engenders strong conversion of [cid:image005.png at 01D5A05E.B56CE400] to [cid:image004.png at 01D5A05E.B56CE400] at 850 hPa and weak conversion of [cid:image005.png at 01D5A05E.B56CE400] to [cid:image004.png at 01D5A05E.B56CE400] at the outflow level leads to the simulation of stronger TCs. Therefore, analyzing this conversion rate of kinetic energy of the flow field helps in understanding the evolution of the intensity of TCs. Shel McGuire Florida State University Academic Program Specialist Department of Earth, Ocean, & Atmospheric Science 1017 Academic Way, 410 Love Building (Meteorology) Tallahassee, FL 32306 850-644-8582 -------------- next part -------------- An HTML attachment was scrubbed... URL: -------------- next part -------------- A non-text attachment was scrubbed... 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Name: image005.png Type: image/png Size: 395 bytes Desc: image005.png URL: From eoas-seminar at lists.fsu.edu Fri Nov 22 08:12:27 2019 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Fri, 22 Nov 2019 13:12:27 +0000 Subject: [Eoas-seminar] Reminder TODAY: EOAS Colloquium speaker this Friday at 3:30 in CAR 101 In-Reply-To: References: Message-ID: Please join us for our last EOAS colloquium speaker of this semester, TODAY at 3:30 in CAR 101: Dr. Raj Dasgupta from Rice University will present: Origin and Early Differentiation of Life-essential Volatile Elements on Earth Inventory of volatile elements such as carbon, hydrogen, nitrogen, and sulfur in the rocky reservoirs of inner Solar System objects is critical for their possible evolution towards establishing habitable surface conditions. However, the undifferentiated feedstock materials can undergo early differentiation in a number of different ways that lead to significantly different budgets of C, H, N, S in the early silicate reservoirs of various planets, planetary embryos, and planetesimals. In this talk, I will use laboratory experimental constraints on the fate of C, H, N, S during accretion and differentiation (e.g., core formation, atmospheric loss, early mantle melting) of rocky bodies, guided by compositions sampled in our own Solar System. The key parameters we will use are partition coefficients of C, N, S, and H between core forming alloy/sulfide melts and silicate melts, solubility constants of volatile gas species in silicate melts (magma oceans), and P-T-dependent solubility of C and N in core forming alloy melt. I will show how with difference in the conditions of core-mantle fractionation (such as depth, temperature, composition, and redox state of alloy-silicate equilibration) and styles of differentiation such as internal differentiation versus magma ocean, low-temperature sulfide segregation, different planetary silicate reservoirs acquire different inventories of C, H, N, S. I will also evaluate how the volatile abundance pattern involving core-mantle equilibration that may be expected for planets? gradual growth via accretion of undifferentiated planetesimals may differ from those where rocky planets experience punctuated and protracted growth via near-disequilibrium merger of differentiated planetary embryo(s). I will show that Earth's major volatile abundance pattern may be best explained by merger of the proto Earth with a Mars sized body with a sulfur-rich core. -------------- next part -------------- An HTML attachment was scrubbed... URL: From eoas-seminar at lists.fsu.edu Mon Nov 25 10:21:28 2019 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Mon, 25 Nov 2019 15:21:28 +0000 Subject: [Eoas-seminar] Next EOAS colloquium 1/17 Message-ID: Due to dept meetings, holidays and breaks, we will not have an EOAS colloquium speaker again until Jan 17, 2020, when our speaker will be Dr. Jolante Van Wijk. Have a Happy Thanksgiving! From eoas-seminar at lists.fsu.edu Tue Nov 26 14:19:41 2019 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Tue, 26 Nov 2019 19:19:41 +0000 Subject: [Eoas-seminar] Meteorology MS Defense for Ethan Wright, December 10, 2019, 2:00 PM, Love 353 Message-ID: Meteorology Seminar Ethan Wright Master?s Meteorology Candidate Title: characterizing buoy wind speed error in extreme conditions through a comparison with scatterometers and era5 Reanalysis Major Professor: Dr. Mark Bourassa Date: December 10th, 2019 Time: 2:00 PM Location: Werner A. Baum Seminar Room (353 Love Building) (Please join us for refreshments served outside room 353 Love @ 1:30 PM) ABSTRACT Buoys are a common source of remote sensing validation data over the open ocean and are one of only a small number of in situ sources in this data sparse region. Previous studies have shown the presence of a low wind speed bias for buoys in extremely high wind conditions, but the data for the high wind speed ranges are limited. Therefore, it is important to test the validity of using buoys as an in situ source for satellite calibration in high winds and high seas using a relatively long record of buoy winds. Sub-setting scatterometer and buoy wind speed differences using wave parameters provides insight into the conditions under which wind speeds diverge between these wind sources. This study uses KNMI ASCAT and NASA QuikSCAT Ocean Vector Wind datasets to compare with buoy winds processed through the Global Telecommunications System and ECMWF ERA5 Reanalysis wave data from 1999 to 2018. The scatterometer, buoy and reanalysis data are triple collocated in space by less than 25 km, and time less than 30 minutes. A probability distribution function (PDF) analysis with wind speed differences sub-divided by wind speed ranges and wave characteristics is performed to test for the dependence of wind speed differences on changing sea states. Wind speed differences are further binned by anemometer height to investigate how physical buoy characteristics affect these differences. To account for buoy wind speed differences due to varying stability in the boundary layer, buoy winds at different anemometer heights are converted to 10 m equivalent neutral winds (U10EN) to compare with scatterometer winds. Comparisons show a difference between the high wind speed calibrations of QuikSCAT and ASCAT where QuikSCAT winds exceed buoy U10EN by nearly 4 m s-1 and ASCAT winds exceed buoy U10EN by 0.65 m s-1 on average in the 20 to 25 m s-1 buoy U10EN range. The PDFs of wind speed differences (Buoy U10EN ? Scatterometer) binned by wind speed ranges vary as a function of ERA5 significant wave height and buoy anemometer height. As significant wave height increases, buoy wind speed differences associated with low anemometers decrease further than wind speed differences measured with higher anemometers. This pattern is particularly apparent when significant wave heights exceeding 4 m are combined with wind speeds exceeding 12 m s-1. Therefore, it is important to consider modification of buoy winds by the wave profile in extreme conditions prior to their application to validate remotely sensed winds. Shel McGuire Florida State University Academic Program Specialist Department of Earth, Ocean, & Atmospheric Science 1017 Academic Way, 410 Love Building (Meteorology) Tallahassee, FL 32306 850-644-8582 -------------- next part -------------- An HTML attachment was scrubbed... URL: From eoas-seminar at lists.fsu.edu Fri Nov 29 08:51:45 2019 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Fri, 29 Nov 2019 08:51:45 -0500 Subject: [Eoas-seminar] Humbolt Research Message-ID: Congratulations are in order for Dr. Sharon NIcholson for being awarded the prestigeous Humbolt Research Award for past accomplishments in research and yteaching. As part of the award Dr. Nicholsen will spend time and collaborate with scientists at the Karlsruhe Institute of Technology. ------------- Dr. Vincent J.M. Salters Professor and Chair Department of Earth, Ocean and Atmospheric Sciences Labs at: Geochemistry Program of the National High Magnetic Field Laboratory Florida State University Tallahassee, Florida Phone: 850-644-1934, Skype: vsalters -------------- next part -------------- An HTML attachment was scrubbed... URL: