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<p class="MsoNormal" align="right" style="text-align:right"><b><span style="font-size:14pt"> </span></b></p>
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<p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-size:36pt;font-family:Cambria,serif;color:rgb(108,63,181)">JCSDA
Seminar</span></b></p>
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<p class="MsoNormal" align="right" style="text-align:right"><b><span style="font-size:14pt">Title</span></b></p>
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<p class="MsoNormal"><b><span style="font-size:14pt;font-family:Arial,sans-serif">The
Tropopause Inversion Layer: What Can We Learn from Data Assimilation?</span></b></p>
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<p class="MsoNormal" align="right" style="text-align:right"><b><span style="font-size:14pt">Speaker</span></b></p>
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<p class="MsoNormal"><b><span style="font-size:14pt;font-family:Arial,sans-serif">Krzysztof Wargan</span></b></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Arial,sans-serif">NASA,
Global Modeling and Assimilation Office (GMAO)</span></p>
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<p class="MsoNormal" align="right" style="text-align:right"><b><span style="font-size:14pt">Date, Time & Place</span></b></p>
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<p class="MsoNormal"><b><span style="font-size:14pt;font-family:Arial,sans-serif">February
25, 2015, 2:00pm - 3:00pm</span></b><span style="font-size:11pt;font-family:Arial,sans-serif"><br>
Conference Center, NOAA Center for Weather and Climate Prediction, 5830 University Research Court, College
Park, MD</span><span style="font-family:Arial,sans-serif"></span></p>
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<p class="MsoNormal" align="right" style="text-align:right"><b><span style="font-size:14pt">Abstract</span></b></p>
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<p style="background-image:initial;background-repeat:initial"><a name="_GoBack"></a><span style="font-size:11pt;font-family:Arial,sans-serif">The Tropopause Inversion Layer (TIL)
is a feature of the extratropical lower stratosphere characterized by a
positive temperature lapse rate associated with a local maximum of static
stability within a shallow layer directly above the tropopause. Its presence
is evident in radiosonde data, Global Positioning System Radio Occultation
measurements and general circulation models. Radiative and dynamical
processes are likely to contribute to its formation but the mechanisms
responsible for the feature are still being investigated. The importance of
the TIL stems from the implications of near-tropopause static stability
patterns for transport of trace gases and wave propagation.</span></p>
<p style="background-image:initial;background-repeat:initial"><span style="font-size:11pt;font-family:Arial,sans-serif">Older
global atmospheric data assimilation systems produced only a weak TIL, in
disagreement with observations. In this talk, we will demonstrate that the feature
is well represented in the Goddard Earth Observing System, version 5 (GEOS-5)
analyses in terms of the season-dependent magnitude, vertical structure and
extent, as permitted by the model resolution but there is a strong dependence
of the analysis TIL on the observing system used. In particular, the
insertion of conventional and hyperspectral radiance data such as from the
Atmospheric Infrared Sounder (AIRS) instrument yields the most realistic
representation of the tropopause static stability. </span></p>
<p style="background-image:initial;background-repeat:initial"><span style="font-size:11pt;font-family:Arial,sans-serif">In
the second part of the talk we will discuss the connections between the
middle atmosphere circulation and the variability of the TIL as seen in
GEOS-5 analyses. We will focus on the impact of sudden stratospheric warming
events on static stability above the wintertime polar tropopause.</span> </p>
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<p class="MsoNormal" align="right" style="text-align:right"><b><i><span style="font-size:14pt">Remote
Access</span></i></b><i></i></p>
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<p class="MsoNormal"><b><i><span style="font-size:11pt;font-family:Arial,sans-serif">Video:</span></i></b><i><span style="font-size:11pt;font-family:Arial,sans-serif"> 1.</span> </i><i><span style="font-size:11pt;font-family:Arial,sans-serif">Go to </span></i><a href="https://star-nesdis-noaa.webex.com/"><i><span style="font-size:11pt;font-family:Arial,sans-serif">JCSDA Seminar</span></i></a><i> </i><i><span style="font-size:10pt;font-family:Arial,sans-serif"><br>
</span></i><i><span style="font-size:11pt;font-family:Arial,sans-serif">2. Enter the event number:</span></i> <b><i><span style="font-size:11pt;font-family:Arial,sans-serif">395 844 299</span></i></b><i><span style="font-size:11pt;font-family:Arial,sans-serif">
<br>
3. Password is<b> JCSDA</b><br>
4. Click "Join Now". <br>
5. Follow the instructions that appear on your screen. <br>
<b>Audio: </b>USA participants:
1-866-715-2479, Passcode: 9457557<br>
International:
1-517-345-5260</span></i><i><span style="font-family:Arial,sans-serif"></span></i></p>
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<p class="MsoNormal" align="right" style="text-align:right"><b><span style="font-size:14pt">Contact</span></b></p>
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<p class="MsoNormal"><span style="font-size:11pt;font-family:Arial,sans-serif">If you would like to present a
seminar contact </span><a href="mailto:Erin.Jones@noaa.gov"><span style="font-size:11pt;font-family:Arial,sans-serif">Erin.Jones@noaa.gov</span></a><span style="font-size:11pt;font-family:Arial,sans-serif"></span></p>
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<p class="MsoNormal" align="right" style="text-align:right"><b><span style="font-size:14pt">Seminar Files</span></b></p>
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<p class="MsoNormal"><span style="font-size:11pt;font-family:Arial,sans-serif">Slides available prior to, and audio
recording after, the presentation at </span><a href="http://www.jcsda.noaa.gov/JCSDASeminars.php"><span style="font-size:11pt;font-family:Arial,sans-serif">http://www.jcsda.noaa.gov/JCSDASeminars.php</span></a><span style="font-size:11pt;font-family:Arial,sans-serif"></span></p>
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</tbody></table></div><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div style="text-align:left"><br></div><div style="text-align:left"><font color="#6600cc" face="verdana, sans-serif"><span style="background-color:rgb(255,255,255)"><b><i>Ana Carrion</i></b></span></font></div><div style="text-align:left"><span style="background-color:rgb(255,255,255)"><font size="1" face="arial, helvetica, sans-serif">National Oceanic and Atmospheric Administration</font></span></div><div style="text-align:left"><font style="background-color:rgb(255,255,255)" size="1" face="arial, helvetica, sans-serif">Program Support Specialist</font></div><div style="text-align:left"><font style="background-color:rgb(255,255,255)" size="1" face="arial, helvetica, sans-serif">Riverside (RTi) at NOAA/NESDIS/STAR/JCSDA</font></div><div style="text-align:left"><font style="background-color:rgb(255,255,255)" size="1" face="arial, helvetica, sans-serif">NCWCP, E/RA, Room #2652</font></div><div style="text-align:left"><font style="background-color:rgb(255,255,255)" size="1" face="arial, helvetica, sans-serif">5830 University Research CT</font></div><div style="text-align:left"><font style="background-color:rgb(255,255,255)" size="1" face="arial, helvetica, sans-serif">College Park, MD 20740-3818</font></div><div style="text-align:left"><font style="background-color:rgb(255,255,255)" size="1" face="arial, helvetica, sans-serif"><br></font></div><div style="text-align:left"><font style="background-color:rgb(255,255,255)" size="1" face="arial, helvetica, sans-serif">Email: <a href="mailto:Ana.Carrion@noaa.gov" target="_blank">Ana.Carrion@noaa.gov</a></font></div><div style="text-align:left"><b style="font-family:arial,helvetica,sans-serif;font-size:x-small"><font color="#cc0000">Main Line</font></b><b style="font-family:arial,helvetica,sans-serif;font-size:x-small">: 301-683-3520</b></div><div style="text-align:left"><font style="background-color:rgb(255,255,255)" size="1" face="arial, helvetica, sans-serif"><b>JCSDA Front Office: 301-683-3615</b></font></div><div style="text-align:left"><font style="background-color:rgb(255,255,255)" size="1" face="arial, helvetica, sans-serif">Fax: 301-683-3526</font></div><div style="text-align:left"><font face="georgia, serif"><br></font></div></div></div></div></div>
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