<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=Windows-1252">
<style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style>
</head>
<body dir="ltr">
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Hi all,</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Here is a seminar announcement in the FSU Meteorology Seminar Series. The information of the seminar is as follows:</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<b>Speaker</b>: Mr. Jacob Carstens, Florida State University<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<b>Title</b>: A Spectrum for Convective Self-Aggregation Based on Background Rotation</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<b>Abstract</b>: Numerical modeling efforts have highlighted a tendency for convection to spontaneously self-organize, when initialized from radiative-convective equilibrium (RCE). This is known as “self-aggregation”, and arises due to interactions between
clouds, water vapor, radiation, and mesoscale circulations. Recent work has hinted that the relative roles of physical mechanisms influencing self-aggregation may change between nonrotating and rotating environments. This suggests that self-aggregation may
be characterized as a continuous spectrum of sorts, where regimes shift as the background rotation is altered. We address this hypothesis using 31 cloud-resolving, f-plane model simulations to resemble a range of tropical latitudes between 0.1°-20°. Simulations
are classified into three groups. The first group (“low-f”, 0.1°-5°) is characterized by preferential drying of the domain, where several dry anomalies emerge early on. These amplify over time, due primarily to radiative effects such as differential longwave
cooling from cloud coverage. Eventually, convection takes the form of either a nonrotating band or a quasi-circular region, the latter of which subsequently spins up into a tropical cyclone (TC). In contrast, the 9°-20° (“high-f”) group dries less rapidly
in the early stages, though enhanced surface flux effects aid in forming an anomalously moist region that eventually undergoes TC genesis. The TC serves as an “aggregating agent” of sorts, drying the domain due to its associated surface fluxes and longwave
cloud radiative feedbacks. Finally, a set of 6°-8° (“medium-f”) simulations fails to fully self-aggregate, continuing to produce convection across most of the domain. Feedback mechanisms that amplify moisture variance in the other simulations are significantly
weaker in this group. Ongoing research seeks to understand why this “medium-f” set of simulations fails to exhibit self-aggregation under either of the other two regimes. Diagnostic equations reveal significant differences in the spatial variability of radiative
cooling and surface enthalpy fluxes, but prognostic and more fundamental solutions remain the overarching goal. Hypotheses are presented for these at the conclusion of the talk, along with a brief description of a larger, cloud-resolving beta-plane simulation
currently in development to further investigate these results.<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<b>Time</b>: 3:30 PM, Thursday, Jan. 21, 2021</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<b>Zoom Link</b>: <a href="https://fsu.zoom.us/j/99318985413?pwd=Y0ZNYnJWYkt4VVNUVTlrOEYwNFlsUT09" id="LPlnk">https://fsu.zoom.us/j/99318985413?pwd=Y0ZNYnJWYkt4VVNUVTlrOEYwNFlsUT09</a><br>
<div class="_Entity _EType_OWALinkPreview _EId_OWALinkPreview _EReadonly_1"></div>
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Also see the seminar flyer.</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Look forward to seeing you then.</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Cheers,</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Zhaohua</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
</body>
</html>