<div dir="ltr"><div class="gmail_default" style="font-size:small">Happening tomorrow.</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">---------- Forwarded message ---------<br>From: <strong class="gmail_sendername" dir="auto">atoc-colloquium (Andrew Winters)</strong> <span dir="auto"><<a href="mailto:atoc-colloquium@lists.colorado.edu">atoc-colloquium@lists.colorado.edu</a>></span><br>Date: Thu, Feb 9, 2023 at 7:37 AM<br>Subject: Re: ATOC Colloquium: Friday, Feb. 10 @ 11am MT – Clairy Reiher, Cole Persch, and Tessa Gorte (SEEC S228 and Zoom)<br>To: <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-students (Julie Lundquist) <<a href="mailto:atoc-students@lists.colorado.edu">atoc-students@lists.colorado.edu</a>>, atoc-faculty (Alexandra Jahn) <<a href="mailto:atoc-faculty@lists.colorado.edu">atoc-faculty@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>>, Andrew Winters <<a href="mailto:andrew.c.winters@colorado.edu">andrew.c.winters@colorado.edu</a>><br></div><br><br><div class="msg-8058203830462711559">




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<div style="margin:0px;background-color:white;color:black"><span style="margin:0px;background-color:white;color:black">Hi everyone,</span>
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<div style="margin:0px;color:black">A<span style="margin:0px"> </span><span style="margin:0px">reminder</span><span style="margin:0px"> </span>that
 the next ATOC<span style="margin:0px"> </span><span style="margin:0px"><span style="margin:0px"><span style="margin:0px">colloquium will be held</span></span></span> on<span style="margin:0px"> </span><b>Friday,
 February 10 at 11am MT over Zoom and in SEEC S228</b>.<span style="margin:0px"> </span><span style="margin:0px;background-color:white;color:black">This week's </span><span style="margin:0px;background-color:white;color:black"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px">colloquium</span></span></span></span></span><span style="margin:0px;background-color:white;color:black"> will
 feature<span style="margin:0px"> </span></span><span style="margin:0px;background-color:white;color:black"></span><span style="margin:0px;background-color:white;color:black">a trio of conference-length
 talks from <b>ATOC graduate students, Clairy Reiher, Cole Persch, and Tessa Gorte</b></span><span style="margin:0px;background-color:white;color:black">.</span><b style="background-color:white;color:black"> <span style="font-weight:400;margin:0px;background-color:white;color:black"><span style="margin:0px;background-color:white;color:black">The
 zoom login information and abstracts for each talk are</span><span style="margin:0px;background-color:white;color:black"> 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.</span></span></b></div>
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<div style="margin:0px;color:black">We look forward to seeing you tomorrow!</div>
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 ATOC<span style="margin:0px"> </span></span><span style="margin:0px;color:black"><span style="margin:0px"><span style="margin:0px">Colloquium</span></span></span><span style="margin:0px;background-color:white;color:black"><span style="margin:0px"> </span>Committee</span></span></span></span></span><br>
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<div style="margin:0px"><b>An Analysis of North American Polar-Subtropical Jet Superpositions that Coincide with High-Impact Weather Events</b></div>
<div style="margin:0px"><span style="margin:0px">Clairy Reiher (ATOC)<br>
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A vertical superposition of the polar and subtropical jet streams constitutes a unique synoptic-scale environment with the potential to induce high-impact weather, including anomalously strong surface cyclones that are accompanied by heavy precipitation and
 strong winds. In this study, we pair a climatology of jet superpositions with climatologies of atmospheric rivers and surface cyclones to determine the frequency with which these features accompany jet superpositions. We subsequently use the association of
 surface cyclones and atmospheric rivers with jet superpositions to construct two subsets of jet superpositions: a set of “high-impact” events that are likely to induce high-impact weather, and a set of “null” events that are unlikely to induce high-impact
 weather. Composite analyses are then performed to identify discriminating environmental factors between high-impact and null events, and how these factors influence jet superposition dynamics.</div>
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<div style="margin:0px;color:black;background-color:white"><span style="margin:0px"><b>The Impact of Orbital Precession on Carbon Flux in the Southern Ocean</b></span></div>
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<div style="margin:0px"><span style="margin:0px">Cole Persch (ATOC)<br>
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<div style="margin:0px;color:rgb(0,0,0)"><span style="margin:0px;color:rgb(0,0,0);background-color:rgb(255,255,255);display:inline!important">Orbital precession has been statistically
 linked to glacial cycles via its influence on the cryosphere, but its direct impact on the atmospheric CO2 record is less well-known. The Southern Ocean is an important driver of atmospheric CO2 due to its rapid carbon outgassing and has been shown to respond
 to precession. This work seeks to test for a link between precession and carbon outgassing in the Southern Ocean that would explain the 21 kyr power found in the historical atmospheric CO2 record. A set of Earth System Models have been run with different orbital
 parameters to isolate the impact of precession on carbon outgassing in the Southern Ocean. Setting the Northern-Hemisphere winter solstice to occur at the perihelion of Earth's orbit results in enhanced carbon outgassing in the Southern Ocean due to the Southern
 Hemisphere Westerlies shifting poleward.</span><br>
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<div style="margin:0px;color:black;background-color:white"><span style="margin:0px"><b>Antarctic Ice Sheet Discharge Drives Large Scale Southern Ocean Circulation Changes</b></span></div>
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<div style="margin:0px"><span style="margin:0px">Tessa Gorte (ATOC)<br>
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<div style="margin:0px;color:rgb(0,0,0)"><span style="margin:0px;color:rgb(0,0,0);background-color:rgb(255,255,255);display:inline!important"><span style="margin:0px;background-color:rgb(255,255,255);display:inline!important;color:rgb(0,0,0)">Multidecadal
 satellite observations indicate that the Antarctic Ice Sheet is losing mass at an accelerating rate. Containing enough water in the form of ice to raise global mean sea level by nearly 70 m, capturing this rapid mass loss is crucial for accurately modelling
 our global climate system; however most models fail to do so for lack of an active ice sheet component for Antarctica. In this project, we create two simulations using the Community Earth System Model version 2 -- one with constant freshwater discharge from
 the AIS and one with an AIS freshwater forcing that mimics findings from satellite observations -- to explore the potential impacts of pseudo-realistic AIS mass loss both locally and globally. We find that the increased AIS freshwater discharge has extensive
 impacts on the Southern Ocean; affecting the temperature and density structure of the internal ocean as well as engendering changes to the ocean-atmosphere heat flux over the course of the 21st century.</span><br>
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<div style="margin:0px;color:black;background-color:white"><b>Topic: ATOC<span style="margin:0px"> </span><span style="margin:0px">Colloquium</span></b>
<div style="margin:0px"><b>Time: Friday, Feb. 10 at 11am MT</b></div>
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<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>
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<span style="font-family:"Calibri Light","Helvetica Light",sans-serif;margin:0px">Assistant Professor</span></div>
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<span style="font-family:"Calibri Light","Helvetica Light",sans-serif;margin:0px">Department of Atmospheric and Oceanic Sciences (ATOC)</span></div>
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<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;color:black">, Boulder,
 CO 80309-0311</span></div>
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 303-735-5775</span></div>
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<div id="m_-8058203830462711559divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> <a href="mailto:atoc-faculty-request@lists.colorado.edu" target="_blank">atoc-faculty-request@lists.colorado.edu</a> <<a href="mailto:atoc-faculty-request@lists.colorado.edu" target="_blank">atoc-faculty-request@lists.colorado.edu</a>> on behalf of atoc-faculty (Andrew Winters) <<a href="mailto:atoc-faculty@lists.colorado.edu" target="_blank">atoc-faculty@lists.colorado.edu</a>><br>
<b>Sent:</b> Monday, February 6, 2023 4:03 PM<br>
<b>To:</b> <a href="mailto:Atoc-majors@lists.colorado.edu" target="_blank">Atoc-majors@lists.colorado.edu</a> <<a href="mailto:atoc-majors@lists.colorado.edu" target="_blank">atoc-majors@lists.colorado.edu</a>>; <a href="mailto:Atoc-minors@lists.colorado.edu" target="_blank">Atoc-minors@lists.colorado.edu</a> <<a href="mailto:atoc-minors@lists.colorado.edu" target="_blank">atoc-minors@lists.colorado.edu</a>>; atoc-students (Julie Lundquist) <<a href="mailto:atoc-students@lists.colorado.edu" target="_blank">atoc-students@lists.colorado.edu</a>>; atoc-faculty (Alexandra Jahn) <<a href="mailto:atoc-faculty@lists.colorado.edu" target="_blank">atoc-faculty@lists.colorado.edu</a>>;
 atoc-researchers (Kelly Duong) <<a href="mailto:atoc-researchers@lists.colorado.edu" target="_blank">atoc-researchers@lists.colorado.edu</a>>; <a href="mailto:atoc-colloquium@lists.colorado.edu" target="_blank">atoc-colloquium@lists.colorado.edu</a> <<a href="mailto:atoc-colloquium@lists.colorado.edu" target="_blank">atoc-colloquium@lists.colorado.edu</a>><br>
<b>Subject:</b> ATOC Colloquium: Friday, Feb. 10 @ 11am MT – Clairy Reiher, Cole Persch, and Tessa Gorte (SEEC S228 and Zoom)</font>
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<span style="font-size:15px;margin:0px;color:rgb(0,0,0);background-color:rgb(255,255,255)"><span style="font-size:12pt;font-family:"Calibri Light","Helvetica Light",sans-serif;margin:0px;color:black;background-color:white"><span style="margin:0px;background-color:white;color:black"><span style="margin:0px;background-color:white;color:black"><span style="margin:0px;background-color:white;color:black"><span style="margin:0px;background-color:white;color:black"><span style="margin:0px;background-color:white;color:black"><span style="margin:0px;background-color:white;color:black"><span style="margin:0px;background-color:white;color:black"><span style="margin:0px;background-color:white;color:black"><span style="margin:0px;background-color:white;color:black"><span style="margin:0px;background-color:white;color:black"><span style="margin:0px;background-color:white"><span style="margin:0px">Hi
 everyone,<br>
</span></span></span></span></span></span></span></span></span></span></span></span></span></span></div>
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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, February 10 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
<b>ATOC graduate students, Clairy Reiher, Cole Persch, and Tessa Gorte.</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;color:black">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;color:black"> </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 Feb. 10!<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>An Analysis of North American Polar-Subtropical Jet Superpositions that Coincide with High-Impact Weather Events</b></div>
<div style="margin:0px"><span style="margin:0px">Clairy Reiher (ATOC)<br>
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A vertical superposition of the polar and subtropical jet streams constitutes a unique synoptic-scale environment with the potential to induce high-impact weather, including anomalously strong surface cyclones that are accompanied by heavy precipitation and
 strong winds. In this study, we pair a climatology of jet superpositions with climatologies of atmospheric rivers and surface cyclones to determine the frequency with which these features accompany jet superpositions. We subsequently use the association of
 surface cyclones and atmospheric rivers with jet superpositions to construct two subsets of jet superpositions: a set of “high-impact” events that are likely to induce high-impact weather, and a set of “null” events that are unlikely to induce high-impact
 weather. Composite analyses are then performed to identify discriminating environmental factors between high-impact and null events, and how these factors influence jet superposition dynamics.</div>
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<div style="margin:0px;color:black;background-color:white"><span style="margin:0px"><b>The Impact of Orbital Precession on Carbon Flux in the Southern Ocean</b></span>
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<div style="margin:0px"><span style="margin:0px">Cole Persch (ATOC)<br>
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<div style="margin:0px"><span style="color:rgb(0,0,0);background-color:rgb(255,255,255);display:inline!important">Orbital precession has been statistically linked to glacial cycles via its influence on the
 cryosphere, but its direct impact on the atmospheric CO2 record is less well-known. The Southern Ocean is an important driver of atmospheric CO2 due to its rapid carbon outgassing and has been shown to respond to precession. This work seeks to test for a link
 between precession and carbon outgassing in the Southern Ocean that would explain the 21 kyr power found in the historical atmospheric CO2 record. A set of Earth System Models have been run with different orbital parameters to isolate the impact of precession
 on carbon outgassing in the Southern Ocean. Setting the Northern-Hemisphere winter solstice to occur at the perihelion of Earth's orbit results in enhanced carbon outgassing in the Southern Ocean due to the Southern Hemisphere Westerlies shifting poleward.</span><br>
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<div style="margin:0px"><span style="color:rgb(0,0,0);background-color:rgb(255,255,255);display:inline!important">
<div style="margin:0px;color:black;background-color:white"><span style="margin:0px"><b>Antarctic Ice Sheet Discharge Drives Large Scale Southern Ocean Circulation Changes</b></span></div>
<div style="margin:0px;color:black;background-color:white">
<div style="margin:0px"><span style="margin:0px">Tessa Gorte (ATOC)<br>
</span></div>
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</span></div>
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<div style="margin:0px"><span style="color:rgb(0,0,0);background-color:rgb(255,255,255);display:inline!important"><span style="color:rgb(0,0,0);background-color:rgb(255,255,255);display:inline!important">Multidecadal
 satellite observations indicate that the Antarctic Ice Sheet is losing mass at an accelerating rate. Containing enough water in the form of ice to raise global mean sea level by nearly 70 m, capturing this rapid mass loss is crucial for accurately modelling
 our global climate system; however most models fail to do so for lack of an active ice sheet component for Antarctica. In this project, we create two simulations using the Community Earth System Model version 2 -- one with constant freshwater discharge from
 the AIS and one with an AIS freshwater forcing that mimics findings from satellite observations -- to explore the potential impacts of pseudo-realistic AIS mass loss both locally and globally. We find that the increased AIS freshwater discharge has extensive
 impacts on the Southern Ocean; affecting the temperature and density structure of the internal ocean as well as engendering changes to the ocean-atmosphere heat flux over the course of the 21st century.</span><br>
</span></div>
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<div style="margin:0px;background-color:white;color:black"><span style="margin:0px"><span style="margin:0px"><span style="margin:0px">__________________________________________________</span></span></span></div>
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<div style="margin:0px;background-color:white;color:black"><u>Zoom login Information:</u></div>
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<div style="margin:0px;background-color:white;color:black"><b>Topic: ATOC<span style="margin:0px"> </span><span style="margin:0px">Colloquium</span></b>
<div style="margin:0px"><b>Time: Friday, Feb. 10 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;background-color:rgb(255,255,255);display:inline!important"></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;background-color:rgb(255,255,255);display:inline!important"></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>
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<span style="font-family:"Calibri Light","Helvetica Light",sans-serif;margin:0px">Department of Atmospheric and Oceanic Sciences (ATOC)</span></div>
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<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;color:black">, 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;color:black">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;color:black"> ||
 @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;background-color:rgb(255,255,255);display:inline!important"></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>-- <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>