<div dir="ltr"><div class="gmail_default" style="font-size:small">FYI</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">---------- Forwarded message ---------<br>From: <strong class="gmail_sendername" dir="auto">Andrew Winters</strong> <span dir="auto"><<a href="mailto:andrew.c.winters@colorado.edu">andrew.c.winters@colorado.edu</a>></span><br>Date: Mon, Apr 10, 2023 at 1:34 PM<br>Subject: ATOC Colloquium: Friday, April 14 @ 11am MT – Vikas Hanasoge Nataraja, Ziqi Yin, and Ethan Murray (SEEC S228 and Zoom) <br>To: atoc-faculty (Alexandra Jahn) <<a href="mailto:atoc-faculty@lists.colorado.edu">atoc-faculty@lists.colorado.edu</a>>, atoc-students (Julie Lundquist) <<a href="mailto:atoc-students@lists.colorado.edu">atoc-students@lists.colorado.edu</a>>, <a href="mailto:Atoc-majors@lists.colorado.edu">Atoc-majors@lists.colorado.edu</a> <<a href="mailto:atoc-majors@lists.colorado.edu">atoc-majors@lists.colorado.edu</a>>, <a href="mailto:Atoc-minors@lists.colorado.edu">Atoc-minors@lists.colorado.edu</a> <<a href="mailto:atoc-minors@lists.colorado.edu">atoc-minors@lists.colorado.edu</a>>, atoc-researchers (Kelly Duong) <<a href="mailto:atoc-researchers@lists.colorado.edu">atoc-researchers@lists.colorado.edu</a>>, <a href="mailto:atoc-colloquium@lists.colorado.edu">atoc-colloquium@lists.colorado.edu</a> <<a href="mailto:atoc-colloquium@lists.colorado.edu">atoc-colloquium@lists.colorado.edu</a>><br></div><br><br><div class="msg2885710981629550207">
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<span style="font-size:12pt;margin:0px;color:black;background-color:white"><span style="font-size:15px;margin:0px;background-color:white"><span style="font-size:12pt;margin:0px;background-color:white"><span style="margin:0px;background-color:white"><span style="margin:0px;background-color:white"><span style="margin:0px;background-color:white"><span style="margin:0px;background-color:white"><span style="margin:0px;background-color:white"><span style="margin:0px;background-color:white"><span style="margin:0px;background-color:white"><span style="margin:0px;background-color:white"><span style="margin:0px;background-color:white"><span style="margin:0px;background-color:white"><span style="margin:0px;background-color:white"><span style="margin:0px">Hi
everyone,<br>
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<div style="margin:0px">The next <span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px">ATOC</span></span></span></span></span> <span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px">Colloquium</span><span style="margin:0px"> </span></span></span></span></span></span></span>will
be held in a hybrid format on<span style="margin:0px"> </span><b>Friday, April 14 from 11a–12p MT over Zoom and in SEEC S228.<span style="margin:0px"> </span></b>This week's <span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px">colloquium</span></span></span></span> will
feature<span style="margin:0px"> a trio of conference-length talks from<span> </span><b>ATOC graduate students, Vikas Hanasoge Nataraja, Ziqi Yin, and Ethan Murray.</b></span> The zoom login
information and abstracts for each talk are provided below. Please join us for coffee and conversation beginning at 10:45am MT, and stay afterwards for a lunch catered by Illegal Pete's.</div>
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<div style="margin:0px">Please let us know if you have any questions or are interested in delivering a talk at a future<span style="margin:0px"> </span><span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px">colloquium</span></span></span></span></span></span></span></span></span>. <span style="margin:0px;background-color:white">A
full schedule of<span style="margin:0px"> </span><span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px">ATOC</span></span></span></span></span><span style="margin:0px"> </span>colloquia
can be found at</span><span style="margin:0px;background-color:white"> </span><a href="https://www.colorado.edu/atoc/colloquium" style="margin:0px;background-color:white" target="_blank">https://www.colorado.edu/<span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px">atoc</span></span></span></span></span>/<span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px">colloquium</span></span></span></span></span></span></span></a>.</div>
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<div style="margin:0px">We look forward to seeing you on Apr. 14!<br>
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<div style="margin:0px">-The<span style="margin:0px"> </span><span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px">ATOC</span></span></span></span></span></span><span style="margin:0px"> </span><span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px">Colloquium</span></span></span></span></span></span></span></span></span><span style="margin:0px"> </span>Committee</div>
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<div style="margin:0px"><b>Using Machine Learning to Improve Cloud Retrievals</b></div>
<div style="margin:0px"><span style="margin:0px">Vikas Hanasoge Nataraja (ATOC/LASP)<br>
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Cloud optical properties play an important role in determining the cloud radiative effect (CRE), surface energy budget, and heating profiles. Cloud optical thickness (COT), in particular, is important for the shortwave CRE. Accurately predicting the COT will
help to improve our understanding of the Earth’s energy budget. Current algorithms for COT retrieval from passive satellite imagery assume that clouds are homogenous within a pixel and neglect the so-called “3D effect” of clouds. We present a machine learning
model that takes into account the spatial context in satellite imagery to retrieve the COT more accurately. Our model uses radiance fields from just a single wavelength and is robust to various optical depths even when trained on a highly constrained and limited
data set. Testing on synthetic and aircraft imagery has shown that the model is grounded in physics and is self-consistent with the radiance fields.<br>
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<span style="margin:0px"><b>High-Resolution, Fully-Coupled Simulations of the Greenland Ice Sheet in a Future, Strong Warming Scenario</b></span></div>
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<div style="margin:0px"><span style="margin:0px">Ziqi Yin (ATOC)<br>
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<div style="margin:0px"><span style="margin:0px;background-color:white">The Greenland Ice Sheet (GrIS) is rapidly losing mass in response to global warming, and its mass loss is driven both by atmospheric
warming, increasing surface melt and meltwater runoff, and oceanic warming, leading to glacier speedup and enhanced ice discharge. Constraining future GrIS mass loss therefore calls for a unified and coupled model infrastructure employed at high horizontal
resolution, allowing to resolve individual glacier basins and detailed atmospheric processes such as orographic precipitation. We will present results of a set of fully coupled CESM2.2-CISM2.1 simulations, in which a variable-resolution grid that features
¼˚ regional refinement over the Arctic is used to represent the atmosphere and land. An idealized warming experiment simulating a scenario with atmospheric CO2 increasing 1% per year until quadrupling the pre-industrial level and then held fixed, is carried
out after a 180-year pre-industrial simulation. We will present results on how the GrIS mass balance and surface mass balance change and briefly cover the impact of these changes on the climate. A comparison between our results and a lower-resolution simulation
using the 1˚ grid will also be discussed.</span><br>
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<span style="margin:0px"><b>Aircraft Measurements of Convective Eye and Eyewall Clouds in Tropical Cyclone Sam</b></span></div>
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<div style="margin:0px"><span style="margin:0px">Ethan Murray (ATOC/LASP)<br>
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<div style="margin:0px"><span style="margin:0px;background-color:white"><span style="margin:0px;background-color:white">Novel aircraft-based observations
are used to diagnose the evolution of an intense tropical cyclone's inner core. Six flights into Tropical Cyclone Sam in 2021 resulted in excellent lidar, radar, and in situ data coverage throughout the storm. Radar data provide a view into the cyclone's overall
precipitation structure, while detailed lidar data highlight Sam's thermodynamic profile and low level clouds in the eye and eyewall. These observations display the variety of convective and stratiform clouds, along with their thermodynamic environments, within
the inner core. In situ observations confirm the thermodynamic changes in Sam, and measurements of horizontal vorticity mixing explain how the cyclone's structure evolves over time.</span><br>
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<b>Topic: ATOC<span style="margin:0px"> </span><span style="margin:0px">Colloquium</span></b>
<div style="margin:0px"><b>Time: Friday, Apr. 14 at 11am MT</b></div>
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<span style="font-size:12pt;font-family:Calibri,Arial,Helvetica,sans-serif;margin:0px;text-align:start;color:black;background-color:white"><span style="font-family:"Calibri Light","Helvetica Light",sans-serif;margin:0px">_______________________________________________________</span></span><span style="font-size:15px;margin:0px;text-align:start;background-color:white"></span><span style="font-size:15px;text-align:start;display:inline!important;background-color:rgb(255,255,255)"></span>
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<span style="font-size:15px;margin:0px;text-align:start;background-color:white"></span><span style="font-size:15px;margin:0px;text-align:start;background-color:white"></span><span style="font-size:15px;margin:0px;text-align:start;background-color:white"></span><span style="font-size:15px;text-align:start;display:inline!important;background-color:rgb(255,255,255)"></span>
<div style="font-size:12pt;font-family:Calibri,Arial,Helvetica,sans-serif;margin:0px;text-align:start;color:black;background-color:white">
<span style="font-family:"Calibri Light","Helvetica Light",sans-serif;margin:0px"><b>Andrew C. Winters</b></span></div>
<div style="font-size:12pt;font-family:Calibri,Arial,Helvetica,sans-serif;margin:0px;text-align:start;color:black;background-color:white">
<span style="font-family:"Calibri Light","Helvetica Light",sans-serif;margin:0px">Assistant Professor</span></div>
<div style="font-size:12pt;font-family:Calibri,Arial,Helvetica,sans-serif;margin:0px;text-align:start;color:black;background-color:white">
<span style="font-family:"Calibri Light","Helvetica Light",sans-serif;margin:0px">Department of Atmospheric and Oceanic Sciences (ATOC)</span></div>
<div style="font-size:12pt;font-family:Calibri,Arial,Helvetica,sans-serif;margin:0px;text-align:start;color:black;background-color:white">
<span style="font-family:"Calibri Light","Helvetica Light",sans-serif;margin:0px">University of Colorado Boulder</span></div>
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<span style="font-family:"Calibri Light","Helvetica Light",sans-serif;margin:0px">311 UCB</span><span style="font-family:"Calibri Light","Helvetica Light",sans-serif;margin:0px">, Boulder, CO
80309-0311</span></div>
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<span style="font-family:"Calibri Light","Helvetica Light",sans-serif;margin:0px">Office: SEEC C277 || </span><span style="font-family:"Calibri Light","Helvetica Light",sans-serif;margin:0px">Phone:
303-735-5775</span></div>
<span style="font-size:12pt;font-family:Calibri,Arial,Helvetica,sans-serif;margin:0px;text-align:start;color:black;background-color:white"><span style="font-family:"Calibri Light","Helvetica Light",sans-serif;margin:0px"></span><a href="https://acwinters.weebly.com/" style="margin:0px" target="_blank"><span style="font-family:"Calibri Light","Helvetica Light",sans-serif;margin:0px">https://acwinters.weebly.com</span></a><span style="font-family:"Calibri Light","Helvetica Light",sans-serif;margin:0px"> ||
@acwinters_wx || he/him/his</span></span><span style="font-size:15px;margin:0px;text-align:start;background-color:white"></span><span style="font-size:15px;text-align:start;display:inline!important;background-color:rgb(255,255,255)"></span>
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<font face="Calibri Light,Helvetica Light,sans-serif"><i><span style="font-family:Roboto,"Helvetica Neue",Helvetica,Arial,sans-serif;margin:0px;outline:0px;color:rgb(17,17,17);background-color:white">CU
Boulder acknowledges that it is located on the traditional territories and ancestral homelands of the Cheyenne, Arapaho, Ute and many other Native American nations. Their forced removal from these territories has caused devastating and lasting impacts.<span style="margin:0px"> </span></span><a href="https://www.colorado.edu/about/land-acknowledgement" style="font-family:Roboto,"Helvetica Neue",Helvetica,Arial,sans-serif;margin:0px;outline:0px;color:rgb(2,119,189);background-color:white" target="_blank">Full
CU Boulder land acknowledgment</a><span style="font-family:Roboto,"Helvetica Neue",Helvetica,Arial,sans-serif;margin:0px;color:rgb(17,17,17);background-color:white"> </span></i></font></div>
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</div></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><font style="background-color:rgb(255,255,255)" color="#000000"><span style="font-family:arial,sans-serif">Scott Briggs (he/him/his)</span></font></div><div><font face="arial, sans-serif" style="background-color:rgb(255,255,255)" color="#000000">Administrator</font></div><div><font face="arial, sans-serif" style="background-color:rgb(255,255,255)" color="#000000"><br></font></div><div dir="ltr"><font face="arial, sans-serif" style="background-color:rgb(255,255,255)" color="#000000">Advanced Study Program<br>Education, Engagement and Early-Career Development<br>National Center For Atmospheric Research</font></div><div><font face="arial, sans-serif" size="1" color="#000000"><i style="background-color:rgb(255,255,255)">phone: 303.497.1607</i></font></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>