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<div style="direction: ltr; font-size: 12pt;"><span style="font-family: Aptos, Arial, Helvetica, sans-serif; color: rgb(0, 0, 0);">Just a reminder of today’s MET seminar,
</span><span style="font-family: Aptos; color: rgb(0, 0, 0);">given by <a href="https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fshimyook.github.io%2F&data=05%7C02%7Ceoas-seminar%40lists.fsu.edu%7Cc23a673c2f7f45ff3d7f08de899cea43%7Ca36450ebdb0642a78d1b026719f701e3%7C0%7C0%7C639099504196058478%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=4drbkFZPx1DA%2FYP954OWuyS1%2FtMpiZ%2BZUzM0fpANK88%3D&reserved=0" originalsrc="https://shimyook.github.io/" data-outlook-id="5a0bf8a4-0c6f-4a6d-acad-e579a2b3b3b9" style="color: rgb(0, 0, 0);">
Dr. Simchan “Shim” Yook</a>, a postdoctoral researcher at MIT. He will speak about “<i>Potential Impacts of a Regional Nuclear Conflict on Climate”.</i></span></div>
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DATE: TODAY March 24</div>
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TIME: 3-4 PM, please join early for refreshments</div>
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LOCATION: EOA 1044 </div>
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SPEAKER: <a href="https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fshimyook.github.io%2F&data=05%7C02%7Ceoas-seminar%40lists.fsu.edu%7Cc23a673c2f7f45ff3d7f08de899cea43%7Ca36450ebdb0642a78d1b026719f701e3%7C0%7C0%7C639099504196100375%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=7mKHGoOxU8lJ5T1avbJkwpHzilNagcCQgGYkGj%2FuX2Q%3D&reserved=0" originalsrc="https://shimyook.github.io/" data-outlook-id="5a0bf8a4-0c6f-4a6d-acad-e579a2b3b3b9">
Dr. Simchan “Shim” Yook</a></div>
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Title: <i>Potential Impacts of a Regional Nuclear Conflict on Climate?</i></div>
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Abstract: Previous research has shown that smoke from large-scale fires ignited by regional-scale nuclear detonations can significantly deplete ozone. Our work expands on this by including emissions of halogen-containing compounds - specifically chlorine and
bromine - released from the combustion of urban infrastructure and industrial materials. These halogens can become activated on smoke particles produced by a regional nuclear war, making them highly effective at catalyzing ozone destruction. Using a chemistry-climate
model, we assess changes in (1) ozone chemistry and surface climate, and (2) stratospheric circulation.</div>
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<div style="font-family: Aptos; font-size: 12pt; color: rgb(0, 0, 0);">In Part 1, we find that Arctic ozone reductions could reach levels similar to those of the Antarctic ozone hole, up to ~80%. We also obtain ozone losses of 40-60% over mid-latitudes, accompanied
by significant increases in surface UV-B radiation. Even a regional nuclear conflict could therefore result in severe ozone depletion and elevated UV exposure, posing serious risks to human health and ecosystems.</div>
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<div style="font-family: Aptos; font-size: 12pt; color: rgb(0, 0, 0);">In Part 2, we investigate the thermodynamic budget of the stratospheric circulation changes. The nuclear emissions induce substantial stratospheric warming of up to ~30 K. Previously, this
was understood as shortwave absorption by injected black carbon (BC) particles. However, our detailed thermodynamic budget analysis shows that the radiative heating is confined to the tropics, while the extratropical and high-latitude anomalies are primarily
driven by the dynamical heat transport - via adiabatic processes and atmospheric eddies.</div>
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<p class="MsoNormal">---------------------------------------------------</p>
<p class="MsoNormal">Allison A. Wing, Ph.D.</p>
<p class="MsoNormal">Werner A. and Shirley B. Baum Associate Professor</p>
<p class="MsoNormal">Department of Earth, Ocean and Atmospheric Science</p>
<p class="MsoNormal">Florida State University</p>
<p class="MsoNormal"><a href="mailto:awing@fsu.edu" data-outlook-id="f45f7475-0739-49dd-aecd-5fec959cc89b" style="margin-top: 0px; margin-bottom: 0px;">awing@fsu.edu</a></p>
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<b>From: </b>Eoas-seminar <eoas-seminar-bounces@lists.fsu.edu> on behalf of eoas-seminar--- via Eoas-seminar <eoas-seminar@lists.fsu.edu><br>
<b>Date: </b>Monday, March 23, 2026 at 8:00 AM<br>
<b>To: </b>eoas-seminar--- via Eoas-seminar <eoas-seminar@lists.fsu.edu>, 'Allison Wing' via info@coaps <info@coaps.fsu.edu><br>
<b>Cc: </b>Chelsea Nam <ccn23b@fsu.edu><br>
<b>Subject: </b>Re: [Eoas-seminar] MET Seminar - Tuesday March 24 3 PM - Dr. Simchan "Shim" Yook (MIT)<br>
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Dear all, </div>
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I’m sending this announcement again in case it got lost as everyone headed off for spring break. </div>
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<span style="font-size: 16px; color: rgb(0, 0, 0);">Please join us for a Meteorology seminar on Tuesday March 24 at 3 PM, given by
</span><span style="font-size: 12pt; color: rgb(0, 0, 0);"><a href="https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fshimyook.github.io%2F&data=05%7C02%7Ceoas-seminar%40lists.fsu.edu%7Cc23a673c2f7f45ff3d7f08de899cea43%7Ca36450ebdb0642a78d1b026719f701e3%7C0%7C0%7C639099504196138510%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=qf2%2FRWe9%2FNVOZyHzVDyJYB5Evtyz1yqW%2F85U9L3XYr8%3D&reserved=0" originalsrc="https://shimyook.github.io/" originalsrc="https://shimyook.github.io/" data-outlook-id="5a0bf8a4-0c6f-4a6d-acad-e579a2b3b3b9" style="color: rgb(0, 0, 0);">Dr.
Simchan “Shim” Yook</a></span><span style="font-size: 16px; color: rgb(0, 0, 0);">, a postdoctoral researcher at MIT. He will speak about “<i>Potential Impacts of a Regional Nuclear Conflict on Climate</i></span><i>”</i><span style="font-size: 16px; color: rgb(0, 0, 0);"><i>.</i></span></div>
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Dr. Yook will be in Tallahassee March 23-25 and is available for meetings - please contact Chelsea Nam (ccn23b@fsu.edu) if you would like to meet with him. His research focuses on interactions between different components of the climate system using model
hierarchies and observations (e.g., ocean-atmosphere interaction, chemistry-climate interaction, radiation-dynamics interaction, etc…). </div>
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More information is below. </div>
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Cheers, </div>
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Allison</div>
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<p class="MsoNormal">---------------------------------------------------</p>
<p class="MsoNormal">Allison A. Wing, Ph.D.</p>
<p class="MsoNormal">Werner A. and Shirley B. Baum Associate Professor</p>
<p class="MsoNormal">Department of Earth, Ocean and Atmospheric Science</p>
<p class="MsoNormal">Florida State University</p>
<p class="MsoNormal"><a href="mailto:awing@fsu.edu" data-outlook-id="dd3330c0-ffe4-4a97-962b-db5549b21cff" style="margin-top: 0px; margin-bottom: 0px;">awing@fsu.edu</a></p>
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<b>From: </b>Allison Wing <awing@fsu.edu><br>
<b>Date: </b>Friday, March 13, 2026 at 1:09 PM<br>
<b>To: </b>eoas-seminar--- via Eoas-seminar <eoas-seminar@lists.fsu.edu>, 'Allison Wing' via info@coaps <info@coaps.fsu.edu><br>
<b>Cc: </b>Chelsea Nam <ccn23b@fsu.edu><br>
<b>Subject: </b>MET Seminar - Tuesday March 24 3 PM - Dr. Simchan "Shim" Yook (MIT)<br>
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<span style="text-transform: none;">Dear all, </span></div>
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Please join us for a Meteorology seminar on Tuesday March 24 (after spring break) at 3 PM, given by
<a href="https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fshimyook.github.io%2F&data=05%7C02%7Ceoas-seminar%40lists.fsu.edu%7Cc23a673c2f7f45ff3d7f08de899cea43%7Ca36450ebdb0642a78d1b026719f701e3%7C0%7C0%7C639099504196175822%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=geUzsuJrs094nzUrawdvrH066F4rB9FUP9V5mA%2F9IEA%3D&reserved=0" originalsrc="https://shimyook.github.io/" originalsrc="https://shimyook.github.io/" data-outlook-id="5a0bf8a4-0c6f-4a6d-acad-e579a2b3b3b9">
Dr. Simchan “Shim” Yook</a>, a postdoctoral researcher at MIT. He will speak about “<i>Potential Impacts of a Regional Nuclear Conflict on Climate” </i>(abstract below).</div>
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<span style="color: rgb(0, 0, 0); text-transform: none;">Dr. Yook will join us in person, but Zoom link is available for those with a medical excuse or approved work off-campus. Please contact Allison Wing (</span><span style="color: rgb(0, 134, 240); text-transform: none;"><a href="mailto:awing@fsu.edu" class="ms-outlook-linkify" title="mailto:awing@fsu.edu" data-ogsc="rgb(0, 134, 240)" data-outlook-id="3b775de3-847f-4320-b67e-8836571d6069" style="color: rgb(0, 134, 240);">awing@fsu.edu</a></span><span style="color: rgb(0, 0, 0); text-transform: none;">)
for the link. </span></div>
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<span style="font-size: 12pt; color: rgb(0, 0, 0); text-transform: none;">Dr. Yook will be in Tallahassee March 23-25 and is available for meetings - please contact Chelsea Nam (</span><span style="color: rgb(0, 0, 0);">ccn23b@fsu.edu) if you would like to
meet with him. His research focuses on interactions between different components of the climate system using model hierarchies and observations (e.g., ocean-atmosphere interaction, chemistry-climate interaction, radiation-dynamics interaction, etc</span>…<span style="color: rgb(0, 0, 0);">). </span></div>
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There will also be a graduate student lunch with Dr. Yook on Tuesday March 24 at 12:30 PM. Grad students - please RSVP to Chelsea Nam (ccn23b@fsu.edu) by the end of the day on Monday March 23. </div>
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Please also join us for drinks and casual conversation with Dr. Yook at Proof @ the Union after his seminar. </div>
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DATE: Tuesday March 24</div>
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TIME: 3-4 PM, please join early for refreshments</div>
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LOCATION: EOA 1044 </div>
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SPEAKER: <a href="https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fshimyook.github.io%2F&data=05%7C02%7Ceoas-seminar%40lists.fsu.edu%7Cc23a673c2f7f45ff3d7f08de899cea43%7Ca36450ebdb0642a78d1b026719f701e3%7C0%7C0%7C639099504196213294%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=TaG%2F8OJCqQ9%2Fw992QeYegQGYZuEbw3W3fxwOxjsv0XQ%3D&reserved=0" originalsrc="https://shimyook.github.io/" originalsrc="https://shimyook.github.io/" data-outlook-id="5a0bf8a4-0c6f-4a6d-acad-e579a2b3b3b9">
Dr. Simchan “Shim” Yook</a></div>
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<span style="text-transform: none;">We look forward to seeing you there!</span></div>
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<span style="text-transform: none;">=========</span></div>
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Title: <i>Potential Impacts of a Regional Nuclear Conflict on Climate?</i></div>
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Abstract: Previous research has shown that smoke from large-scale fires ignited by regional-scale nuclear detonations can significantly deplete ozone. Our work expands on this by including emissions of halogen-containing compounds - specifically chlorine and
bromine - released from the combustion of urban infrastructure and industrial materials. These halogens can become activated on smoke particles produced by a regional nuclear war, making them highly effective at catalyzing ozone destruction. Using a chemistry-climate
model, we assess changes in (1) ozone chemistry and surface climate, and (2) stratospheric circulation.</div>
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In Part 1, we find that Arctic ozone reductions could reach levels similar to those of the Antarctic ozone hole, up to ~80%. We also obtain ozone losses of 40-60% over mid-latitudes, accompanied by significant increases in surface UV-B radiation. Even a regional
nuclear conflict could therefore result in severe ozone depletion and elevated UV exposure, posing serious risks to human health and ecosystems.</div>
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In Part 2, we investigate the thermodynamic budget of the stratospheric circulation changes. The nuclear emissions induce substantial stratospheric warming of up to ~30 K. Previously, this was understood as shortwave absorption by injected black carbon (BC)
particles. However, our detailed thermodynamic budget analysis shows that the radiative heating is confined to the tropics, while the extratropical and high-latitude anomalies are primarily driven by the dynamical heat transport - via adiabatic processes and
atmospheric eddies.</div>
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<p class="MsoNormal" style="margin-top: 0px; margin-bottom: 0px;">---------------------------------------------------</p>
<p class="MsoNormal" style="margin-top: 0px; margin-bottom: 0px;">Allison A. Wing, Ph.D.</p>
<p class="MsoNormal" style="margin-top: 0px; margin-bottom: 0px;">Werner A. and Shirley B. Baum Associate Professor</p>
<p class="MsoNormal" style="margin-top: 0px; margin-bottom: 0px;">Department of Earth, Ocean and Atmospheric Science</p>
<p class="MsoNormal" style="margin-top: 0px; margin-bottom: 0px;">Florida State University</p>
<p class="MsoNormal" style="margin-top: 0px; margin-bottom: 0px;"><a href="mailto:awing@fsu.edu" data-outlook-id="7016530e-e293-4e4c-a7f9-2adf51ca2a31" style="margin-top: 0px; margin-bottom: 0px;">awing@fsu.edu</a></p>
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