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<p class="HTMLBody" align="center" style="text-align:center;line-height:115%"><b><u><span style="font-size:26.0pt;line-height:115%;font-family:"Monotype Corsiva"">Meteorology Seminar<o:p></o:p></span></u></b></p>
<p class="HTMLBody" align="center" style="text-align:center;line-height:115%"><b><span style="font-size:28.0pt;line-height:115%;font-family:"Monotype Corsiva"">S</span></b><b><span style="font-size:28.0pt;line-height:115%;font-family:"Monotype Corsiva";mso-fareast-language:ZH-CN">huhang
Xue</span></b><span style="font-size:28.0pt;line-height:115%;font-family:"Monotype Corsiva""><o:p></o:p></span></p>
<p class="HTMLBody" align="center" style="text-align:center"><span style="font-size:28.0pt;font-family:"Monotype Corsiva"">Masters Meteorology Candidate<o:p></o:p></span></p>
<p class="HTMLBody"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="doublespacedcaps" align="left" style="text-align:left;line-height:normal">
<b><u><span style="font-size:14.0pt">Title</span></u>:</b> T<span style="mso-fareast-language:ZH-CN">he linkage between the extreme cold air outbreaks and Rossby-wave breaking over Asia</span><span style="font-size:14.0pt;mso-fareast-language:ZH-CN"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><u><span style="font-size:14.0pt">Major Professor</span></u></b><b><span style="font-size:14.0pt">: Mark Bourassa, Jeffery Chagnon</span></b><b><u><span style="font-size:14.0pt;font-family:Times"><o:p></o:p></span></u></b></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><u><span style="font-size:14.0pt">Date</span></u></b><b><span style="font-size:14.0pt">:</span></b><span style="font-size:14.0pt"> November 13th, 2020
<b><u>Time</u>: 8:30 AM</b></span><span style="font-size:14.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
<p class="HTMLBody"><b><o:p> </o:p></b></p>
<p class="MsoNormal"><b><u><span style="font-size:14.0pt">Location</span></u></b><b><span style="font-size:14.0pt">:</span></b><span style="color:#201F1E;background:white;mso-fareast-language:ZH-CN">
</span><b><span style="font-size:14.0pt">Zoom meeting </span></b><span style="color:black"><a href="https://urldefense.com/v3/__https:/fsu.zoom.com.cn/j/97720754328__;!!PhOWcWs!mSUGnlh1QA0xWReMF_xN-7N0VR6CMR51FyJB0jwfWUuk_q9skU6MIK0TrQvzT2o$">https://fsu.zoom.com.cn/j/97720754328</a><o:p></o:p></span></p>
<p class="HTMLBody"><b><o:p> </o:p></b></p>
<p class="MsoNormal" align="center" style="text-align:center"><b><o:p> </o:p></b></p>
<p class="MsoNormal" align="center" style="text-align:center"><b>ABSTRACT<o:p></o:p></b></p>
<p class="MsoNormal" align="center" style="text-align:center"><b><o:p> </o:p></b></p>
<p class="MsoNormal" style="text-indent:.5in"><span style="mso-ligatures:standard;mso-contextual-alternates:yes">The statistical relationship between Rossby-wave breaking and extreme cold air outbreaks (CAO) is investigated for East Asia. Two typical life cycles
of upper-level Rossby waves during these CAOs are identified. The extreme CAOs are selected using a quantitative CAO index, which is defined by the integral of equatorward cold air mass flux below 280K isentropic surfaces. Rossby-wave breaking events are identified
as anticyclonic and cyclonic according to the orientation of breaking. The breaking extent is calculated as the ratio of longitudes with breaking to the whole longitude range in each of four different regions. The composite analysis shows a significant increase
in anticyclonic breaking extent upstream and cyclonic breaking extent downstream during western CAOs, and a decrease in cyclonic breaking extent midstream during eastern CAOs, respectively. During the demise days of extreme CAOs, the breaking extent returns
to the level before onset. On the other hand, the average eastern and western CAO indices are notably higher during the days of cyclonic breaking. For the days of anticyclonic breaking, both CAOs tend to have higher indices when the breaking is upstream and
lower indices when the breaking is downstream. Chi-Square tests of independence reveal that extreme western and eastern CAOs have prominent dependent relation with Rossby-wave breaking. The former vigorously synchronizes well with anticyclonic breaking upstream
and cyclonic breaking downstream, while the latter lags the cyclonic breaking in the midstream for about three days. The composited potential vorticity fields during East Asia extreme CAOs illustrates two archetypes of wave life cycles. One is the anticyclonic
wave breaking upstream of the CAOs and jet core; the other is the cyclonic wave breaking downstream of the jet and CAOs.<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Shel McGuire<o:p></o:p></p>
<p class="MsoNormal">Florida State University<o:p></o:p></p>
<p class="MsoNormal">Academic Program Specialist<o:p></o:p></p>
<p class="MsoNormal">Department of Earth, Ocean, & Atmospheric Science<o:p></o:p></p>
<p class="MsoNormal">1011 Academic Way, 2019 EOA Building<o:p></o:p></p>
<p class="MsoNormal">Tallahassee, FL 32306<o:p></o:p></p>
<p class="MsoNormal">850-644-8582<o:p></o:p></p>
<p class="MsoNormal">To make an appointment please login to my.fsu.edu and choose the Campus Connect (CC) icon<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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