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<span style="font-size: 12pt; font-family: Calibri, Arial, Helvetica, sans-serif; margin: 0px; color: black;" class="ContentPasted0"><span class="ContentPasted0">Dear colleague,</span></span></div>
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<span style="font-size: 12pt; font-family: Calibri, Arial, Helvetica, sans-serif; margin: 0px; color: black;" class="ContentPasted0"><span class="ContentPasted0">Here is the announcement of this week's EOAS colloquium:</span></span></div>
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<div style="margin:0px"><span style="margin:0px"><span style="margin:0px" class="ContentPasted1"><b class="ContentPasted1">Time</b>: Friday, Jan. 12 @ 3:00 PM</span></span></div>
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<div style="margin:0px"><span style="margin:0px"><span style="margin:0px" class="ContentPasted1"><b class="ContentPasted1">Location</b>:<span class="ContentPasted1"> </span><span data-markjs="true" class="markh34z3y9ts ContentPasted1" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="" style="margin:0px">EOAS</span><span class="ContentPasted1"> </span>1050
(regular<span class="ContentPasted1"> </span><span data-markjs="true" class="markh34z3y9ts ContentPasted1" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="" style="margin:0px">EOAS</span><span class="ContentPasted1"> </span><span data-markjs="true" class="markpl3rm35c2 ContentPasted1" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="" style="margin:0px">colloquium</span><span class="ContentPasted1"> </span>room)</span></span></div>
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<div style="margin:0px"><span style="margin:0px"><span style="margin:0px" class="ContentPasted1"><b class="ContentPasted1 ContentPasted2" style="background-color: rgb(255, 255, 255);">Speaker</b><span style="display: inline !important; background-color: rgb(255, 255, 255);" class="ContentPasted2">:</span><span class="ContentPasted1 ContentPasted2" style="margin: 0px; background-color: rgb(255, 255, 255);"> Zhaohua
Wu, EOAS, Florida State University</span><br>
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<span style="font-size: 12pt; font-family: Calibri, Arial, Helvetica, sans-serif; margin: 0px; color: black;" class="ContentPasted0"><b class="ContentPasted0">Title</b>: Waves in a spatially varying mean flow</span></div>
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<span style="font-size: 12pt; font-family: Calibri, Arial, Helvetica, sans-serif; margin: 0px; color: black;"><b style="font-size: 16px; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);" class="ContentPasted0">Abstract</b><span style="font-size: 16px; display: inline !important; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);" class="ContentPasted0">:
Mechanical waves are propagating dynamic disturbances that redistribute energy or other physical quantities in the spatial domain. How waves propagate in a medium has been one of the most studied topics in all fields of natural sciences. Yet many fundamental
questions regarding wave propagation in a complicated and varying medium remain to be understood. In this talk, the speaker will introduce his study in the past decade on the propagation of tropical atmospheric waves in a varying mean flow, seeking to explain
why the observed tropical atmospheric waves should behave as they are. The focal point is placed on how wave amplitude changes in a varying mean flow as it propagates away from its original location. By formulating waves in a general form independent of wave
systems, an equation of the spatiotemporal change of wave amplitude that only involves medium characteristics is derived, which is a more physically intuitive and understandable form of the wave action equation proposed in the 1960s. This study of waves also
involves a methodology shift used in diagnosing waves: from Fourier transform-based global wave formulation to novel localized wave formulation.</span></span><br>
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<div style="font-size: 12pt; color: rgb(0, 0, 0);"><font face="Calibri, Arial, Helvetica, sans-serif">A Zoom link to the talk is available only by request.</font></div>
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<div style="font-size: 12pt; color: rgb(0, 0, 0);"><font face="Calibri, Arial, Helvetica, sans-serif">Cheers,</font></div>
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<div style="font-size: 12pt; color: rgb(0, 0, 0);"><font face="Calibri, Arial, Helvetica, sans-serif">Zhaohua</font></div>
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