From eoas-seminar at lists.fsu.edu Sun Aug 4 19:45:54 2024 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Sun, 4 Aug 2024 19:45:54 -0400 Subject: [Eoas-seminar] COAPS Short Seminars are postponed due to TC Debby Message-ID: The COAPS Short Seminars scheduled for this Monday will be postponed due to TC Debby.? I will reschedule the talks after getting input from the speakers.? Please be safe. Regards, Mark From eoas-seminar at lists.fsu.edu Wed Aug 21 13:33:44 2024 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Wed, 21 Aug 2024 17:33:44 +0000 Subject: [Eoas-seminar] [Seminar-announce] Scientific Computing Colloquium with Joseph Chan Message-ID: "Advancing the Geospatial Big Data Fusion of Observations and Forecast Models" Man-Yau (Joseph) Chan Assistant Professor Department of Geography The Ohio State University Please feel free to forward/share this invitation with other groups/disciplines that might be interested in this talk/topic. All are welcome to attend. NOTE: In-person attendance is requested. Zoom access is intended for external (non-departmental) participants only. https://fsu.zoom.us/j/94273595552 Meeting # 942 7359 5552 ? Colloquium recordings will be made available here, https://www.sc.fsu.edu/colloquium Wednesday, Aug 28th, 2024, Schedule: * 3:00 to 3:30 PM Eastern Time (US and Canada) ? Nespresso & Teatime - 417 DSL Commons * 3:30 to 4:30 PM Eastern Time (US and Canada) ? Colloquium - 499 DSL Seminar Room Abstract: Numerical weather predictions (NWPs) are essential for a wide range of socioeconomic activities (e.g., green energy production and disaster warnings). Advancements in the accuracy, precision and spatial resolution of NWP will thus benefit society. Since NWP generates predictions by evolving inputted initial atmospheric states (i.e., initial conditions), the precision and accuracy of NWP depends on the accuracy and precision of those initial conditions. These initial conditions are generated by the Geospatial Big Data Fusion of observations and past forecasts. This Fusion process is known as data assimilation (DA). As such, advances in DA will improve those socioeconomically important NWPs. One of the most popular classes of DA methods for thunderstorms are the ensemble Kalman filters (EnKFs). EnKFs convert point observations into multivariate geospatial forecast corrections through multivariate geospatial forecast statistics. This conversion employs Bayesian inference under the assumption of multivariate Gaussian prior statistics. While EnKFs have been remarkably successful at improving thunderstorm NWP, that Gaussian prior assumption often breaks down in thunderstorms. That breakdown can generate forecast-degrading statistical artifacts. As such, to advance thunderstorm NWP, it is essential to (1) identify those artifacts and their impacts and (2) advance DA methods that avoid that Gaussian prior assumption. In this seminar, I will present on 1. Forecast-wrecking artifacts that arise from the violation of EnKFs? Gaussian prior assumption, 2. A novel, efficient and scalable extension of the EnKF (bi-Gaussian EnKFs) that potentially produces better forecasts than the EnKF, and, 3. A simple, efficient, scalable and flexible method to suppress sampling errors in Monte Carlo DA methods. No prior knowledge of DA or meteorology is needed to understand this seminar. Additional colloquium details can be found here, https://www.sc.fsu.edu/news-and-events/colloquium/1811-colloquium-with-joseph-chan-2024-08-28 -------------- next part -------------- An HTML attachment was scrubbed... URL: -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: text/calendar Size: 6293 bytes Desc: not available URL: -------------- next part -------------- _______________________________________________ SC-Seminar-announce mailing list SC-Seminar-announce at lists.fsu.edu https://lists.fsu.edu/mailman/listinfo/sc-seminar-announce From eoas-seminar at lists.fsu.edu Mon Aug 26 12:13:29 2024 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Mon, 26 Aug 2024 16:13:29 +0000 Subject: [Eoas-seminar] Colloquium announcement, Friday, August 30th at 3:00 PM Message-ID: Hello all, Happy start of the semester! I am pleased to announce that this semester's first colloquium will be held on Friday (08/30) at 3:00 PM. As you can see below, we will begin with a discussion of Dinosaurs and Mammals presented by the new Curator of Vertebrate Paleontology at the Florida Museum, Advait Jukar. Please spread the word to any and all who may be interested. If you would like to schedule a time to meet with Advait on Friday please let me know. The Evolution of Local Communities from the Mesozoic to the Cenozoic Dr. Advait M. Jukar Assistant Curator of Vertebrate Paleontology Department of Natural History, Florida Museum of Natural History University of Florida Abstract The nature of an ecological community has been heavily debated. In the fossil record, the closest approximation is a bone bed or quarry where an assemblage of species has accumulated over a geologically short time span, and likely represents a group of species that was contemporaneous in a region. While most studies of diversity in the past have focused on the global or continental scales, analyses of these local fossil communities can provide insights into community assembly processes and patterns that cannot be gleaned from a global perspective. And in some ways, provide a better scale of comparison. In this lecture, using examples from the fossil record of herbivorous dinosaurs and mammals, I will illustrate (1) the differences between the ways dinosaur communities and mammal communities are structured, and (2) the changes in the functional structure of the herbivore guild through time, and (3) the patterns and causes behind the hyper-diversity of herbivores are various times during the Cenozoic. Dinosaur assemblages are structured fundamentally differently from mammal assemblages, even at the local scale, and mammalian herbivores in North America change their community structures through the Cenozoic in concert with climate change. In South Asia, a period of extremely high diversity of megaherbivores is seen in local assemblages during the Miocene, but following the transition from C3 to C4 grasslands, this diversity is never recovered. The diversity patterns highlight the role of not only the environment, but also potentially ontogeny and biotic interactions in structuring local herbivore assemblages through time. Location: EOAS 1050 Time: Friday, August 30 at 3:00 PM See you then, -Scott Assistant Professor Department of Earth, Ocean and Atmospheric Sciences Florida State University Office: EOAS 3021 https://scotte233.wixsite.com/paleobiology -------------- next part -------------- An HTML attachment was scrubbed... URL: From eoas-seminar at lists.fsu.edu Fri Aug 30 11:52:20 2024 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Fri, 30 Aug 2024 15:52:20 +0000 Subject: [Eoas-seminar] Colloquium announcement, Friday, August 30th at 3:00 PM In-Reply-To: References: Message-ID: Hello all, Just a friendly reminder about Dr. Jukar's seminar today at 3pm in EOAS 1050. Please join us! You can also join via zoom using the following link: https://fsu.zoom.us/j/92414563957 Happy Friday, -Scott Join our Cloud HD Video Meeting Zoom is the leader in modern enterprise video communications, with an easy, reliable cloud platform for video and audio conferencing, chat, and webinars across mobile, desktop, and room systems. Zoom Rooms is the original software-based conference room solution used around the world in board, conference, huddle, and training rooms, as well as executive offices and classrooms. Founded in 2011, Zoom helps businesses and organizations bring their teams together in a frictionless environment to get more done. Zoom is a publicly traded company headquartered in San Jose, CA. fsu.zoom.us ________________________________ From: Scott Evans Sent: Monday, August 26, 2024 12:13 PM To: eoas-seminar at lists.fsu.edu Subject: Colloquium announcement, Friday, August 30th at 3:00 PM Hello all, Happy start of the semester! I am pleased to announce that this semester's first colloquium will be held on Friday (08/30) at 3:00 PM. As you can see below, we will begin with a discussion of Dinosaurs and Mammals presented by the new Curator of Vertebrate Paleontology at the Florida Museum, Advait Jukar. Please spread the word to any and all who may be interested. If you would like to schedule a time to meet with Advait on Friday please let me know. The Evolution of Local Communities from the Mesozoic to the Cenozoic Dr. Advait M. Jukar Assistant Curator of Vertebrate Paleontology Department of Natural History, Florida Museum of Natural History University of Florida Abstract The nature of an ecological community has been heavily debated. In the fossil record, the closest approximation is a bone bed or quarry where an assemblage of species has accumulated over a geologically short time span, and likely represents a group of species that was contemporaneous in a region. While most studies of diversity in the past have focused on the global or continental scales, analyses of these local fossil communities can provide insights into community assembly processes and patterns that cannot be gleaned from a global perspective. And in some ways, provide a better scale of comparison. In this lecture, using examples from the fossil record of herbivorous dinosaurs and mammals, I will illustrate (1) the differences between the ways dinosaur communities and mammal communities are structured, and (2) the changes in the functional structure of the herbivore guild through time, and (3) the patterns and causes behind the hyper-diversity of herbivores are various times during the Cenozoic. Dinosaur assemblages are structured fundamentally differently from mammal assemblages, even at the local scale, and mammalian herbivores in North America change their community structures through the Cenozoic in concert with climate change. In South Asia, a period of extremely high diversity of megaherbivores is seen in local assemblages during the Miocene, but following the transition from C3 to C4 grasslands, this diversity is never recovered. The diversity patterns highlight the role of not only the environment, but also potentially ontogeny and biotic interactions in structuring local herbivore assemblages through time. Location: EOAS 1050 Time: Friday, August 30 at 3:00 PM See you then, -Scott Assistant Professor Department of Earth, Ocean and Atmospheric Sciences Florida State University Office: EOAS 3021 https://scotte233.wixsite.com/paleobiology -------------- next part -------------- An HTML attachment was scrubbed... URL: From eoas-seminar at lists.fsu.edu Fri Aug 30 16:51:25 2024 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Fri, 30 Aug 2024 20:51:25 +0000 Subject: [Eoas-seminar] MET seminar - Tuesday Sep 3 - Dr. Jie Sun (FSU) Message-ID: All, Our first Meteorology seminar of the semester will be on Tuesday September 3 at 3pm. Please join us for a talk by our own Dr. Jie Sun (FSU) on the topic of ?Understanding of Hurricane Surface Wind Profiles from the Effective Absolute Angular Momentum Perspective.? DATE: Tuesday Sep 3 TIME: 3 PM LOCATION: EOAS 1044 SPEAKER: Dr. Jie Sun TITLE: Understanding of Hurricane Surface Wind Profiles from the Effective Absolute Angular Momentum Perspective ABSTRACT: Tropical cyclones (TCs) are among the deadliest and costliest natural hazards. Beside TC track, the intensity and size are the two important metrics for assessing TC severity and potential hazards. Despite considerable progress in predicting TC track, our current understanding and prediction capabilities regarding the TC intensity-size relation and the resultant TC surface wind profile remain limited. Our previous study (Sun et al., 2022) reveals that the radial profile of a TC's surface wind is primarily governed by its effective absolute angular momentum (eAAM). The eAAM combines the TC's absolute angular momentum (AAM) with its inward frictional loss rates, serving as a radial invariant for the TC. The radial profiles of surface winds for individual TCs can be uniquely determined based on the inward frictional loss rates and their eAAM values. In this talk, I will present results obtained from two series of idealized axis-symmetric TC simulations using Cloud Model 1 (CM1). Each of the two series consists of idealized axis-symmetric TC simulations initialized with different initial vortices. One series uses a lower value for the momentum exchange coefficient (Cd) and the other uses a higher value, representing two different environment conditions for TCs. Our findings indicate that under the same value of Cd, the radial profiles of TC surface winds simulated by the CM1 model with different initial vortices can be accurately reproduced by the eAAM model under the same parameters for the inward loss rates of AAM. Larger initial vortices have lager radii for inflows towards TC centers under the same conditions of surface roughness, sea surface temperature, and moisture content. Therefore, larger initial vortices result in larger values of eAAM for TCs. The larger their eAAM values, the stronger their surface winds are at the same radii. The effect of differences in Cd can be modeled by different parameter values for the inward loss rates of AAM in the eAAM model. The immediate consequence of the increase in the inward loss rates of AAM is the weakening of surface winds at the same radii. For the same initial vortices, the increase in the inward loss rates of AAM also affects radial profiles of TC surface winds inevitably by decreasing their eAAM values. The decrease in eAAM values is a result of the contraction of the radii for inflows towards TC centers when TCs reach their equilibrium states. The reduction in eAAM values under stronger surface roughness also contributes to the weakening of surface winds at the same radii. Christopher D. Holmes, PhD Associate Professor of Meteorology and Environmental Science Earth, Ocean and Atmospheric Science Florida State University EOAS Room 6091 phone: 850-645-0972 https://acgc.eoas.fsu.edu -------------- next part -------------- An HTML attachment was scrubbed... URL: