From eoas-seminar at lists.fsu.edu Mon Dec 1 09:50:39 2025 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Mon, 1 Dec 2025 14:50:39 +0000 Subject: [Eoas-seminar] Colloquium on December 5, 3:00 PM at EOA 1044 Message-ID: Hi All, You are cordially invited to attend the weekly EOAS Colloquium Series for the 2025?2026 academic year. Below are the details of the seminar scheduled for December 5, 2025. A poster of the colloquium is also attached to this email. Look forward to seeing you at the colloquium. ============= Time: 3:00 - 4:00 PM, Friday, December 5. Location: EOA 1044 Speaker: Prof. Yao Fu Title: Interannual variability of the subpolar AMOC Abstract: Variability of the Atlantic Meridional Overturning Circulation (AMOC) has drawn extensive attention due to its impact on the global redistribution of heat and freshwater. Here we present the latest time series (2014-2022) of the Overturning in the Subpolar North Atlantic Program (OSNAP) and characterize AMOC interannual variability through a volume budget analysis for the subpolar basins? lower limbs. We find that surface water mass transformation is linked to lower limb volume variability, which translates to AMOC changes within the same year. The subpolar North Atlantic has also undergone unprecedented freshening in the past decade. The OSNAP observations provide a unique opportunity to examine how freshwater forcing influences AMOC variability. Preliminary results show that as the freshwater anomaly moved through first the eastern and then the western subpolar gyre, it generated a transient AMOC signal on interannual timescales: overturning weakened in the eastern subpolar gyre but strengthened in the western gyre a few months later. In both gyres, the overturning changes were linked to salinity-induced density anomalies, which produced cross-basin geostrophic velocity anomalies. Our findings highlight the role of freshwater forcing in subpolar AMOC variability on interannual timescales and suggest a compensating mechanism between eastern and western subpolar overturning. ================ Ming Ye, Robert Spenser, and Zhaohua Wu *************************************************************** Zhaohua Wu, Professor Earth, Ocean, and Atmospheric Science Building, Room 6041, and Center for Ocean-Atmospheric Prediction Studies, Room 295 Florida State University Tallahassee, Florida zwu at fsu.edu **************************************************************** -------------- next part -------------- An HTML attachment was scrubbed... URL: -------------- next part -------------- A non-text attachment was scrubbed... Name: 120525_Yao_Fu.pdf Type: application/pdf Size: 130187 bytes Desc: 120525_Yao_Fu.pdf URL: From eoas-seminar at lists.fsu.edu Tue Dec 2 07:45:00 2025 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Tue, 2 Dec 2025 12:45:00 +0000 Subject: [Eoas-seminar] =?utf-8?q?TODAY_3_PM_-_MET_Seminar-_Dr=2E_Katheri?= =?utf-8?q?ne_Ackerman_=28University_of_Hawai=E2=80=98i_at_M=C4=81noa_and_?= =?utf-8?q?University_of_Notre_Dame=29?= In-Reply-To: References: Message-ID: Dear all, This is a reminder of our last Meteorology seminar of the semester today, given by Dr. Katherine Ackerman, an NSF Postdoctoral Research Fellow between University of Hawai?i at M?noa and University of Notre Dame. She will present "A Holistic Approach to Understanding In Situ Observations of Giant Sea Salt Aerosol Globally? . 3 PM in 1044, see you there! --------------------------------------------------- Allison A. Wing, Ph.D. Werner A. and Shirley B. Baum Associate Professor Department of Earth, Ocean and Atmospheric Science Florida State University awing at fsu.edu From: Eoas-seminar on behalf of eoas-seminar--- via Eoas-seminar Date: Tuesday, November 25, 2025 at 4:08?PM To: Eoas-seminar , 'Allison Wing' via info at coaps Subject: [Eoas-seminar] MET Seminar Tuesday December 2 - Dr. Katherine Ackerman (University of Hawai?i at M?noa and University of Notre Dame) Dear all, Please join us for our last Meteorology seminar of the semester, which is next Tuesday December 2 at 3 PM, given by Dr. Katherine Ackerman, an NSF Postdoctoral Research Fellow between University of Hawai?i at M?noa and University of Notre Dame. She will present "A Holistic Approach to Understanding In Situ Observations of Giant Sea Salt Aerosol Globally? (abstract below) Dr. Ackerman will present over Zoom but we will gather together in EOA 1044. A zoom link is available for those with approved work off-campus or a medical excuse. Please contact Allison Wing (awing at fsu.edu) for the Zoom link. If you would like to meet with the speaker over Zoom, also contact Allison Wing. Dr. Ackerman?s current research combines in situ observations of sea salt aerosol with large eddy simulations to understand the mechanisms dictating the transport of these giant particles throughout the boundary layer. DATE: Tuesday December 2 TIME: 3-4 PM, please join early for refreshments LOCATION: EOA 1044 SPEAKER: Dr. Katherine Ackerman TITLE: A Holistic Approach to Understanding In Situ Observations of Giant Sea Salt Aerosol Globally ABSTRACT: Giant sea salt aerosol (GSSA; dry radius > 1 ?m) plays a critical role in Earth?s radiative budget, aerosol?cloud interactions, and potentially warm-rain initiation, yet major uncertainties remain in its production, transport, and global distribution. Historically, these knowledge gaps have been driven by limited access to affordable, high-resolution observational tools capable of resolving the largest sea-salt particles in sufficient detail. Recent advances in low-cost in-situ instrumentation have expanded the capacity to measure GSSA size distributions (GSSA-SDs) across a wider range of field environments, including regions where traditional instruments would have been prohibitively expensive or logistically impractical. Increased observations combined with reanalysis tools and models have led to novel insights of these giant aerosol concentrations globally, as well as important assessments of their representation in models. Overall, instantaneous environmental conditions alone can misrepresent the processes controlling GSSA abundance; instead, air-mass history and cumulative exposure to surface wind and ocean state exert strong influences on the concentrations measured at a given time. This talk focuses on 1) the importance of accessible aerosol observations, as well as 2) some key nuances of interpreting these field observations within a broader environmental context. We look forward to seeing you there! --------------------------------------------------- Allison A. Wing, Ph.D. Werner A. and Shirley B. Baum Associate Professor Department of Earth, Ocean and Atmospheric Science Florida State University awing at fsu.edu -------------- next part -------------- An HTML attachment was scrubbed... URL: From eoas-seminar at lists.fsu.edu Tue Dec 2 11:57:36 2025 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Tue, 2 Dec 2025 16:57:36 +0000 Subject: [Eoas-seminar] 12/4/25 - PhD Defense - William Curtis Message-ID: Hello all, Please join us for William Curtis' PhD Defense on Thursday, December 4th @ 10:00 am EST, in EOAS 6067 and on zoom. Title: NON-THUNDERSTORM CUMULUS ELECTRIFICATION ASSESSMENT AND PREDICTIVE ANALYSIS USING MACHINE LEARNING METHODS Name: William Curtis Date: Thursday, December 4th at 10:00 am EST Major Professor: Henry Fuelberg Location: EOAS 6067 Zoom: https://fsu.zoom.us/j/96050348445 Abstract: The electrification of developing convective, non-thunderstorm cumulus clouds is investigated utilizing a combination of a rapidly scanning dual-pol radar and a dense network of surface field mills that measure the vertical electric potential gradient. Current launch safety criteria employ a combination of cloud top temperature and potential gradient threshold values to assess the potential for natural and triggered lightning. A novel dataset of clouds within the field mill network is constructed and investigated based on the behavior of the surrounding field mill sites to assess the electrification. Field mill data is analyzed using gridded 1-minute averaged potential gradients. Previous research utilized various reflectivity thresholds for different temperature levels to differentiate between electrified clouds, lightning producing clouds, and different electrification thresholds. Reflectivity data at different temperature levels and hydrometeor classification algorithm output are utilized in concert with cloud top temperature to represent cloud characteristics and explain surface electric field behavior. This study utilizes supervised machine learning models and explainable AI diagnostic tools to provide a comparison between radar parameters and their association with surface potential gradients. Hydrometeor classification algorithm output provides a substantial benefit to cloud classification based on surface potential gradients and predicting the magnitude of negative potential gradient values through the vertical ice class of hydrometeors. Cloud top temperatures colder than -5?C indicate steadily greater likelihood for strong negative potential gradients, and increasing vertical ice further contributes to stronger negative potential gradients. The application of machine learning and hydrometeor classification produces novel insight into the dependencies between radar parameters and their diagnostic capabilities for assessing electrification in developing convective clouds. Best, Adea Adea Arrison Sr. Academic Program Specialist Department of Earth, Ocean & Atmospheric Science [cid:image001.png at 01DC6380.1CF90DC0] -------------- next part -------------- An HTML attachment was scrubbed... URL: -------------- next part -------------- A non-text attachment was scrubbed... Name: image001.png Type: image/png Size: 3433 bytes Desc: image001.png URL: From eoas-seminar at lists.fsu.edu Tue Dec 2 09:53:36 2025 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Tue, 2 Dec 2025 14:53:36 +0000 Subject: [Eoas-seminar] Pie-a-Professor / Pie-a-Grad-Student Fundraiser Message-ID: Hello everyone! Please join us TOMORROW, December 3rd, for a fundraiser event hosted by the North Fl. Chapter of the American Meteorological Society/ National Weather Association (AMS/NWA). See details below: Date: December 3rd, 2025 Time: 4:30 pm - 5:30 pm Location: EOAS 1st floor western entrance, grassy area Description: We are hosting a fundraiser called "Pie-a-Professor" / "Pie-a-Grad Student", where you will be able to make a small donation for the chance to throw a pie at volunteer "target" faculty and students. "Targets" include Profs. Hart, Fuelberg, and Misra, as well as many EOAS graduate students. All faculty are welcome to be additional targets, including those already contacted. All donations will directly support AMS/NWA activities, including student attendance at the upcoming AMS conference, guest speakers for events, catering, etc. For those who cannot attend in person, there is a GoFundMe link below if you would like to donate ? and this link will also be shared with alumni (and you are welcome to share it with them as well). Any amount helps, big or small! Please email our chapter secretary, Carolyn Emerson, if you have any questions (cje20a at fsu.edu). GoFundMe link: https://gofund.me/d7e70d5f0 Hope to see you there! Melody Geiger Graduate Teaching Assistant Earth, Ocean & Atmospheric Science Florida State University [https://brand.fsu.edu/sites/g/files/upcbnu4656/files/media/email-signature/formal-arts-sciences.png] -------------- next part -------------- An HTML attachment was scrubbed... URL: From eoas-seminar at lists.fsu.edu Fri Dec 5 09:09:50 2025 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Fri, 5 Dec 2025 14:09:50 +0000 Subject: [Eoas-seminar] Fw: Colloquium on December 5, 3:00 PM at EOA 1044 In-Reply-To: References: Message-ID: Hi all, This is just a friendly remind that we have a colloquium today at 3:00 PM, see the forwarded information. Please join to enjoy the last colloquium of this semester. Cheers, Zhaohua ________________________________ From: Eoas-seminar on behalf of eoas-seminar--- via Eoas-seminar Sent: Monday, December 1, 2025 9:50 AM To: Eoas-seminar ; 'Allison Wing' via info at coaps Subject: [Eoas-seminar] Colloquium on December 5, 3:00 PM at EOA 1044 Hi All, You are cordially invited to attend the weekly EOAS Colloquium Series for the 2025?2026 academic year. Below are the details of the seminar scheduled for December 5, 2025. A poster of the colloquium is also attached to this email. Look forward to seeing you at the colloquium. ============= Time: 3:00 - 4:00 PM, Friday, December 5. Location: EOA 1044 Speaker: Prof. Yao Fu Title: Interannual variability of the subpolar AMOC Abstract: Variability of the Atlantic Meridional Overturning Circulation (AMOC) has drawn extensive attention due to its impact on the global redistribution of heat and freshwater. Here we present the latest time series (2014-2022) of the Overturning in the Subpolar North Atlantic Program (OSNAP) and characterize AMOC interannual variability through a volume budget analysis for the subpolar basins? lower limbs. We find that surface water mass transformation is linked to lower limb volume variability, which translates to AMOC changes within the same year. The subpolar North Atlantic has also undergone unprecedented freshening in the past decade. The OSNAP observations provide a unique opportunity to examine how freshwater forcing influences AMOC variability. Preliminary results show that as the freshwater anomaly moved through first the eastern and then the western subpolar gyre, it generated a transient AMOC signal on interannual timescales: overturning weakened in the eastern subpolar gyre but strengthened in the western gyre a few months later. In both gyres, the overturning changes were linked to salinity-induced density anomalies, which produced cross-basin geostrophic velocity anomalies. Our findings highlight the role of freshwater forcing in subpolar AMOC variability on interannual timescales and suggest a compensating mechanism between eastern and western subpolar overturning. ================ Ming Ye, Robert Spenser, and Zhaohua Wu *************************************************************** Zhaohua Wu, Professor Earth, Ocean, and Atmospheric Science Building, Room 6041, and Center for Ocean-Atmospheric Prediction Studies, Room 295 Florida State University Tallahassee, Florida zwu at fsu.edu **************************************************************** -------------- next part -------------- An HTML attachment was scrubbed... URL: -------------- next part -------------- A non-text attachment was scrubbed... Name: 120525_Yao_Fu.pdf Type: application/pdf Size: 130187 bytes Desc: 120525_Yao_Fu.pdf URL: -------------- next part -------------- _______________________________________________ Eoas-seminar mailing list Eoas-seminar at lists.fsu.edu https://lists.fsu.edu/mailman/listinfo/eoas-seminar From eoas-seminar at lists.fsu.edu Mon Dec 8 11:58:38 2025 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Mon, 8 Dec 2025 16:58:38 +0000 Subject: [Eoas-seminar] update from the colloquium committee Message-ID: Dear All, Zhaohua, Rob, and I would like to give you an update on our planning for the colloquium of the 2026 Spring semester. The plan is subject to a substantial amount of uncertainty due to the faculty search. Excluding the Fridays of faculty meetings (Jan 9, Feb 6, Mar 6, Apr 3, and May 1) and the Friday of spring break (Mar 20), we will have a total of 11 Fridays for colloquia, and below is the current arrangement: 1. Reserve two Fridays for the MET faculty search. 2. Reserve one Friday (maybe two) for the GLY faculty search. 3. Vincent will give a talk. 4. Emily and Michael will give a joint seminar on their collaborative research. 5. Maya will invite a speaker from the FSU geography department. 6. We will have one Friday for graduate students (three students) and another Friday for post-docs (two post-docs). Please let us know if you want your students and/or post-docs to give a talk. 7. Lisa will invite an external speaker from OCE group. 8. Zhaohua may invite an external speaker for the MET group. 9. Mike Sukop from FIU will give his Birdsall-Dreiss Lecture on 2/20 (the Geological Society of America will pay the travel but we need to pay lodging). Except the GSA Birdsall-Dreiss Lecture, the colloquium dates are still pending. We will try our best to finalize the colloquium schedule as early as possible, so that we can have a full colloquium next semester. Please let us know if you have any questions. Thanks. Ming -------------- Ming Ye, Ph.D. Professor in Hydrogeology Department of Earth, Ocean, and Atmospheric Science Department of Scientific Computing Office: 3015 EOAS Building (1011 Academic Way) Phone: 850-645-4987 Florida State University Tallahassee, FL 32306-4520 Email: mye at fsu.edu http://earth.eoas.fsu.edu/~mye/ -------------- next part -------------- An HTML attachment was scrubbed... URL: