<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, Sep 11, 2023 at 8:23 AM<br>Subject: ATOC Colloquium: Friday, September 15 @ 11am MT – Ulla Heede, Michelle Maclennan, Kara Hartig – SEEC S228 and Zoom<br>To: <a href="mailto:atoc-faculty@colorado.edu">atoc-faculty@colorado.edu</a> <<a href="mailto:atoc-faculty@colorado.edu">atoc-faculty@colorado.edu</a>>, ATOC Graduate Students <<a href="mailto:atoc-students@colorado.edu">atoc-students@colorado.edu</a>>, <a href="mailto:atoc-majors@colorado.edu">atoc-majors@colorado.edu</a> <<a href="mailto:atoc-majors@colorado.edu">atoc-majors@colorado.edu</a>>, <a href="mailto:atoc-minors@colorado.edu">atoc-minors@colorado.edu</a> <<a href="mailto:atoc-minors@colorado.edu">atoc-minors@colorado.edu</a>>, <a href="mailto:atoc-researchers@colorado.edu">atoc-researchers@colorado.edu</a> <<a href="mailto:atoc-researchers@colorado.edu">atoc-researchers@colorado.edu</a>>, <a href="mailto:atoc-colloquium@colorado.edu">atoc-colloquium@colorado.edu</a> <<a href="mailto:atoc-colloquium@colorado.edu">atoc-colloquium@colorado.edu</a>><br>Cc: Hartig, Kara <<a href="mailto:kara_hartig@g.harvard.edu">kara_hartig@g.harvard.edu</a>><br></div><br><br><div class="msg-3396874779288266467">
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<span style="font-size:12pt;margin:0px;color:black;background-color:rgb(255,255,255)"><span style="margin:0px;background-color:white"><span style="margin:0px;background-color:white"><span style="font-size:15px;margin:0px;background-color:white"><span style="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, September 15 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 talks from
<b>Dr. Ulla Heede (ATOC/CIRES), Michelle Maclennan (ATOC), and Kara Hartig (Harvard). </b></span><span style="background-color:white">The zoom login information and abstracts for each talk</span><span style="background-color:white"> are
provided below. Please join us for conversation beginning at 10:45am MT, and stay afterwards for a lunch catered by Illegal Pete's.</span></div>
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<div style="margin:0px">We look forward to seeing you on Friday!<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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<b>Tropical Pacific Warming Patterns Influence Future Hydroclimate Extremes in the Americas<br>
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<div style="margin:0px">Ulla Heede (ATOC/CIRES)</div>
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The tropical Pacific has an uncertain future. The issue of how the tropical Pacific will respond to global warming is vigorously debated, yet, unfortunately, we still have no clear answer whether the eastern Pacific will experience enhanced warming in the 21st century
as global climate models predict, or whether current trends will continue or perhaps plateau. In this talk, I present a study in which my co-authors and I address this issue head on by designing a novel set of A-GCM experiments where everything is held constant except the
pattern of warming in the tropical Pacific. This way, we can isolate the effects of the eastern Pacific warming on the terrestrial hydroclimate. We find that the eastern Pacific warming has a very pronounced effect in several regions across the Americas manifesting
as both modulation of long-term trends, and changes in ENSO-related extreme events. These findings have wide reached implications for adaptation and climate risk assessment.</div>
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<div style="margin:0px"><span style="margin:0px;color:rgb(0,0,0);background-color:white"><b>Fieldwork on Thwaites Eastern Ice Shelf,
Antarctica <br>
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<div style="margin:0px">Michelle Maclennan (ATOC)</div>
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West Antarctica’s Thwaites Glacier is approximately the size of the state of Florida and currently contributes 4% of all global sea-level rise. In recent decades, the flow of ice from Thwaites Glacier into the ocean has accelerated, and it could contribute
several centimeters of sea level rise by the end of the century. Thwaites Eastern Ice Shelf, the floating ice at the terminus of Thwaites Glacier, is the fastest-changing part of the glacier. Warm circumpolar deep water has melted the ice shelf from below
and large rifts are causing the ice shelf to crack apart from the side, and as a result it is expected that Thwaites Eastern Ice Shelf will collapse in the next 1-4 years. In December 2022, a team of 7 researchers traveled down to Thwaites Eastern Ice Shelf
to download oceanographic data on basal melt, perform glaciological measurements of the ice shelf thickness and rifts, and collect water samples and snow density profiles at the surface. This was the third and final field season on the ice shelf, and the last
major opportunity to study this unique and rapidly changing region before its imminent collapse. Here, we present a summary of the fieldwork conducted and early results on the current conditions of Thwaites Eastern Ice Shelf, along with pictures and stories
from the field. <br>
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<div style="margin:0px"><span style="margin:0px;color:rgb(0,0,0);background-color:white"><b>How Warmer Climates Prevent Continental
Interiors from Dropping Below Freezing<br>
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<div style="margin:0px">Kara Hartig (Harvard)</div>
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<div style="margin:0px"><span style="display:inline!important;color:rgb(0,0,0);background-color:rgb(255,255,255)">In spite of the mean warming trend over the last few decades and its amplification
in the Arctic, some studies have found no robust decline or even a slight increase in wintertime cold air outbreaks over North America. But fossil evidence from warmer paleoclimate periods indicates that the interior of North America never dropped below freezing
even in the depths of winter, which implies that the maintenance of cold air outbreaks is unlikely to continue indefinitely with future warming. To identify key mechanisms affecting cold air outbreaks and understand how and why they will change in a warmer
climate, we examine the development of North American cold air outbreaks in both a pre-industrial and a roughly 8xCO2 scenario with the Community Earth System Model, CESM2. Using a combination of model climatology and air parcel trajectory analysis, we demonstrate
how the loss of the surface temperature inversion, increased heat and moisture fluxes over the Arctic Ocean, and subsequent changes to diabatic heating terms prevent North American temperatures from ever dropping below freezing in the warmer climate.</span></div>
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<u>Zoom login Information:</u></div>
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<b>Topic: ATOC Colloquium</b>
<div style="margin:0px"><b>Time: Sep 15, 2023 11:00 AM Mountain Time (US and Canada)</b></div>
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<div style="margin:0px"><b><a href="https://cuboulder.zoom.us/j/98582201579" id="m_-3396874779288266467OWA4adc4231-e3d0-493e-48fe-a3d6fa9fbbcf" style="margin:0px" target="_blank">https://cuboulder.zoom.us/j/98582201579</a></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></div>
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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>
<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">311 UCB</span><span style="font-family:"Calibri Light","Helvetica Light",sans-serif;margin:0px">, Boulder, CO
80309-0311</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">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://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Facwinters.weebly.com%2F&data=05%7C01%7Catoc-colloquium%40colorado.edu%7C3460e64a3e094f6621c408dbb2d251a8%7C3ded8b1b070d462982e4c0b019f46057%7C1%7C0%7C638300389796364835%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=xUu%2BwS2CNu8GdTsamY%2BOTFJOKJ52gmFzjakyKwwV%2BZA%3D&reserved=0" id="m_-3396874779288266467OWA12438f7b-2a25-4451-3391-734b3ada622e" 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" id="m_-3396874779288266467OWAee66d76e-a0dd-f0cc-49da-4ef43b96d5f7" 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><span style="font-family:arial,sans-serif;color:rgb(0,0,0)">Scott Briggs (he/him/his)</span><br></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>