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<div dir="ltr" style="color: rgb(0, 0, 0);"><font face="Arial">Dear all, </font></div>
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<div style="text-align: left; text-indent: 0px; margin: 0in;"><font face="Arial"><span style="color: black;">Please join us for our next Meteorology seminar on<b> Tuesday November 4 at 3 PM</b>. This will be a special combined MET seminar which will feature
shorter presentations by two visiting speakers: <a href="https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftropical.colostate.edu%2F&data=05%7C02%7Ceoas-seminar%40lists.fsu.edu%7Cfb378474a3c14246f97008de16f178d4%7Ca36450ebdb0642a78d1b026719f701e3%7C0%7C0%7C638973423519201655%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=8zGwVMNMw956xXlF39QpHAlmEyd5SncppvtVvpgV418%3D&reserved=0" originalsrc="https://tropical.colostate.edu/" data-outlook-id="377511a2-c5e2-4aaa-b465-4eb900592b0a" style="margin-top: 0px; margin-bottom: 0px;">
Prof. Michael Bell</a></span><a href="https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftropical.colostate.edu%2F&data=05%7C02%7Ceoas-seminar%40lists.fsu.edu%7Cfb378474a3c14246f97008de16f178d4%7Ca36450ebdb0642a78d1b026719f701e3%7C0%7C0%7C638973423526122784%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=KpAleCCmDRC%2FdUX0TWSLekCH2ALoFyI321lPdizCL3o%3D&reserved=0" originalsrc="https://tropical.colostate.edu/" data-outlook-id="2cf98cb6-d3d6-4e21-8406-64728ddaae81" style="text-decoration: none; margin-top: 0px; margin-bottom: 0px;">
</a><span style="color: black;">from Colorado State University and <a href="https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fjruppert.oucreate.com%2F&data=05%7C02%7Ceoas-seminar%40lists.fsu.edu%7Cfb378474a3c14246f97008de16f178d4%7Ca36450ebdb0642a78d1b026719f701e3%7C0%7C0%7C638973423526161100%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=cO%2Fe72Gocn0%2BD5MxquIOp2Jk20PaSlmSzdfOncsBoLE%3D&reserved=0" originalsrc="https://jruppert.oucreate.com/" data-outlook-id="d396b2c6-85e3-41bf-a682-24520580aa53" style="margin-top: 0px; margin-bottom: 0px;">
Prof. James </a></span><a href="https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fjruppert.oucreate.com%2F&data=05%7C02%7Ceoas-seminar%40lists.fsu.edu%7Cfb378474a3c14246f97008de16f178d4%7Ca36450ebdb0642a78d1b026719f701e3%7C0%7C0%7C638973423526188624%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=4KrwQEiDGHPkiC2mcr9%2BVnT%2BRyEyu9NGl%2BFYZZ%2Fp3D8%3D&reserved=0" originalsrc="https://jruppert.oucreate.com/" data-outlook-id="f8666a2a-7728-4baa-acc0-e88d4263961c" style="margin-top: 0px; margin-bottom: 0px;">Ruppert</a><a href="https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fjruppert.oucreate.com%2F&data=05%7C02%7Ceoas-seminar%40lists.fsu.edu%7Cfb378474a3c14246f97008de16f178d4%7Ca36450ebdb0642a78d1b026719f701e3%7C0%7C0%7C638973423526205072%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=fxik9hWC2y5%2FFnQAczhbsoubgqnm8SIQl9F87PiRt7U%3D&reserved=0" originalsrc="https://jruppert.oucreate.com/" data-outlook-id="36b77330-cf3c-484d-b3d8-c028822e1085" style="text-decoration: none; margin-top: 0px; margin-bottom: 0px;">
</a>from University of Oklahoma. </font></div>
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<div style="text-align: left; text-indent: 0px; margin: 0in;"><font face="Arial">Prof. Bell will speak about "<i>Relationships between Rotation and Rainfall in African Easterly Waves</i>” and Prof. Ruppert will speak about "<i>Interpreting longwave radiative
feedback from stratiform and anvil clouds”. </i>Their abstracts are below.<i> </i></font></div>
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<div style="text-align: left; text-indent: 0px; margin: 0in;"><font face="Arial"><span style="color: black;">Both speakers will present in person in EOA 1044 but a Zoom link is available for
</span>those <span style="color: black;">with approved work off-campus or a medical excuse. Please contact Allison Wing (awing@fsu.edu) for the Zoom link. </span></font></div>
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<div style="text-align: left; text-indent: 0px; margin: 0in;"><span style="color: black;"><font face="Arial">DATE: Tuesday November 4</font></span></div>
<div style="text-align: left; text-indent: 0px; margin: 0in;"><span style="color: black;"><font face="Arial">TIME: 3-4 PM, please join early for refreshments</font></span></div>
<div style="text-align: left; text-indent: 0px; margin: 0in;"><span style="color: black;"><font face="Arial">LOCATION: EOA 1044 (speakers in person)</font></span></div>
<div style="text-align: left; text-indent: 0px; margin: 0in;"><span style="color: black;"><font face="Arial">SPEAKER:
<a href="https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftropical.colostate.edu%2F&data=05%7C02%7Ceoas-seminar%40lists.fsu.edu%7Cfb378474a3c14246f97008de16f178d4%7Ca36450ebdb0642a78d1b026719f701e3%7C0%7C0%7C638973423526219428%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=QuTzdPOyUadgJ1nIGmMUA4o4%2BJO1k%2F33xFGUU27nFT4%3D&reserved=0" originalsrc="https://tropical.colostate.edu/" data-outlook-id="3c03bad9-84fc-430f-b61d-5e2f12d0db14" style="margin-top: 0px; margin-bottom: 0px;">
Prof. Michael Bell</a> & <a href="https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fjruppert.oucreate.com%2F&data=05%7C02%7Ceoas-seminar%40lists.fsu.edu%7Cfb378474a3c14246f97008de16f178d4%7Ca36450ebdb0642a78d1b026719f701e3%7C0%7C0%7C638973423526233005%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=ZAvCXX1WKmBYHb%2Bi1Z2T5sVN93BD%2BBmQcSAjnkzbreI%3D&reserved=0" originalsrc="https://jruppert.oucreate.com/" data-outlook-id="27825ab1-7be6-420d-9821-6d2ead2efd08" style="margin-top: 0px; margin-bottom: 0px;">
Prof. James Ruppert</a></font></span></div>
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<div style="text-align: left; text-indent: 0px; margin: 0in;"><span style="color: black;"><font face="Arial">SPEAKER 1:
<a href="https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftropical.colostate.edu%2F&data=05%7C02%7Ceoas-seminar%40lists.fsu.edu%7Cfb378474a3c14246f97008de16f178d4%7Ca36450ebdb0642a78d1b026719f701e3%7C0%7C0%7C638973423526247079%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=OVwsgYHr7g889KRNeKRckcssJo9CHwn%2B%2BdYtAu0meh4%3D&reserved=0" originalsrc="https://tropical.colostate.edu/" data-outlook-id="dc6c7a60-9baf-470e-9876-fa344f29d13c" style="margin-top: 0px; margin-bottom: 0px;">
Prof. Michael Bell</a></font></span></div>
<div style="text-align: left; text-indent: 0px; margin: 0in;"><span style="color: black;"><font face="Arial">TITLE:
<i>Relationships between Rotation and Rainfall in African Easterly Waves</i></font></span></div>
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<div style="color: black;"><font face="Arial">ABSTRACT: Recent observations have shown a positive correlation between rotating flow and higher rain rates associated with mesoscale convective organization. The ability of convection to enhance rotation can be
understood through the direct effects of vortex stretching and convective heating, but the reverse influence of rotation on convection is more complicated and indirect. Multiple physical mechanisms can lead to enhanced convection associated with mesoscale
potential vorticity (PV) anomalies, including isentropic uplift, mesoscale pressure perturbations, boundary layer pumping, moisture advection, and interactions with larger scale environmental flow. These mechanisms are not mutually exclusive, leading to complex
vertical motion patterns that are sometimes difficult to ascribe to any single factor. This talk will explore these mechanisms in African Easterly Waves (AEWs) which are broad, weakly rotating systems in the tropical Atlantic. AEWs contribute substantially
to the total rainfall over the tropical Atlantic and Caribbean and also serve as the precursor disturbances for 85% of major hurricanes. The relationships between PV, moisture, and convective organization are examined using aircraft observations from the NASA
2006 NAMMA (NASA African Monsoon Multidisciplinary Analysis) and 2022 CPEX-CV (Convective Processes Experiment - Cabo Verde) field campaigns and idealized modeling. Observations show that deep convection is organized into different regions within AEWs associated
with higher mid-level moisture and PV interacting with the environmental flow. Idealized modeling experiments show that boundary layer pumping associated with the rotating flow is weak in AEWs, but becomes progressively more important with increased rotation
and smaller circulations. A positive feedback between rotation and rainfall, in which PV promotes convection that further amplifies the PV through convective heating, becomes more effective with increased rotation and can lead to cyclogenesis and hurricane
development. </font></div>
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<div style="color: black;"><font face="Arial">SPEAKER 2: Prof. James Ruppert</font></div>
<div style="color: black;"><font face="Arial">TITLE:<i> Interpreting longwave radiative feedback from stratiform and anvil clouds</i></font></div>
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<div style="color: black;"><font face="Arial">ABSTRACT: Our emphasis on distinct tropical cloud types has evolved over the decades with advancements in our understanding, especially of the complex links between the convective scale and larger scales. Early
undilute plume views of tropical convection emphasized deep cumulonimbi and their associated latent heating as a fundamental component of the ascending branch of the Hadley cell. Later, emphasis on tropical shallow and congestus clouds increased as we better
grasped the acute sensitivity of tropical convection to water vapor in the free troposphere, prompting major reconsiderations for how to represent moist convection in numerical models. In this context, we advocate for revisiting the role of stratiform and
anvil clouds: we argue that these clouds play an essential role in convective-scale dynamics in the tropics through their longwave radiative forcing. The magnitude of longwave radiative forcing relative to latent heating within these clouds is very large,
significantly affecting both buoyancy and circulation. It increases moist entropy and suppresses evaporatively driven mesoscale downdrafts, resulting in greater upward motion per unit precipitation. This effect fosters growth of the parent convective system,
constituting a positive feedback. The radiative forcing of these clouds, which are much larger and longer-lived than their parent deep convective elements, acts as an important link between the convective scale and larger scales. Hence, while stratiform and
anvil clouds are indeed biproducts of deep convection, they should also be recognized as active players in tropical organized convection. Consequently, any comprehensive model or parameterization of tropical convection must account for the bidirectional forcing
between deep convective systems and their attendant stratiform and anvil cloud signatures.</font></div>
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<div style="text-align: left; text-indent: 0px; margin: 0in;"><span style="color: black;"><font face="Arial">We look forward to seeing you there!</font></span></div>
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<div style="margin: 0in;"><font face="Arial">---------------------------------------------------</font></div>
<div style="margin: 0in;"><font face="Arial">Allison A. Wing, Ph.D.</font></div>
<div style="margin: 0in;"><font face="Arial">Werner A. and Shirley B. Baum Associate Professor</font></div>
<div style="margin: 0in;"><font face="Arial">Department of Earth, Ocean and Atmospheric Science</font></div>
<div style="margin: 0in;"><font face="Arial">Florida State University</font></div>
<div style="margin: 0in;"><span style="color: rgb(70, 120, 134);"><u><a href="mailto:awing@fsu.edu" data-outlook-id="5ee85cd0-bed4-4460-8db9-33749d5e89b5" style="color: rgb(70, 120, 134); margin-top: 0px; margin-bottom: 0px;"><font face="Arial">awing@fsu.edu</font></a></u></span></div>
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