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<p class="MsoNormal" style="text-align:center" align="center"><b style><span style="font-size:36.0pt;font-family:"Cambria","serif";color:#6c3fb5">JCSDA
Seminar</span></b></p>
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<p class="MsoNormal" style="text-align:right" align="right"><b style><span style="font-size:14.0pt">Title</span></b></p>
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<p class="MsoNormal" style><b><span style="font-size:16.0pt;font-family:"Arial","sans-serif"">Improvement
of Global Forecast System (GFS) Land Surface Skin Temperature and Its Impact
on Satellite Data Assimilation</span></b><b style><span style="font-size:20.0pt;font-family:"Arial","sans-serif""></span></b></p>
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<p class="MsoNormal" style="text-align:right" align="right"><b style><span style="font-size:14.0pt">Speaker</span></b></p>
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<p class="MsoNormal" style><b style><span style="font-size:14.0pt;font-family:"Arial","sans-serif"">Jesse
Meng<br>
NOAA National Centers for Environmental Prediction </span></b><span style="font-size:14.0pt;font-family:"Arial","sans-serif""></span></p>
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<p class="MsoNormal" style="text-align:right" align="right"><b style><span style="font-size:14.0pt">Date, Time & Place</span></b></p>
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<p class="MsoNormal" style><b style><span style="font-size:14.0pt;font-family:"Arial","sans-serif"">Friday,
March 15, 2013</span></b><b style><span style="font-size:16.0pt;font-family:"Arial","sans-serif""><br>
</span></b><span style="font-family:"Arial","sans-serif"">2:00 – 3:00 PM<br>
</span><span style="font-size:11.0pt;font-family:"Arial","sans-serif"">Conference
Center, NOAA Center for Weather and Climate Prediction, <span style>5830 University Research Court, College
Park, MD</span></span><span style="font-family:"Arial","sans-serif""></span></p>
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<p class="MsoNormal" style="text-align:right" align="right"><b style><span style="font-size:14.0pt">Abstract</span></b></p>
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<p class="MsoPlainText" style="text-align:justify;text-justify:inter-ideograph"><span style="font-size:11.0pt">Comparison of the land surface skin temperature
(LST) from the National Centers for Environmental Prediction (NCEP)
operational Global Forecast System (GFS) against satellite and in situ data
in summer 2007 indicates that the GFS has a large and cold bias in LST over
the arid western continental United States (CONUS) during daytime. This LST
bias contributes to large errors in simulated satellite brightness
temperatures over land by the Community Radiative Transfer Model (CRTM) and
hence the rejection of satellite data in the NCEP Gridpoint Statistical
Interpolation (GSI) system, especially for surface-sensitive satellite
channels. The new vegetation-dependent formulations of momentum and thermal
roughness lengths are tested in the GFS. They substantially reduce the large
cold bias of daytime LST over the arid western CONUS in the warm season.
This, in turn, significantly reduces the large biases of calculated satellite
brightness temperatures found for infrared and microwave sensors in window or
near-window channels, so that many more satellite data can be assimilated in
the GSI system. In the arid western CONUS, the calculation of surface
emissivity for microwave sensors in the CRTM can be further improved, and the
new microwave land emissivity model together with increased LST via changes
in surface roughness length formulations reduces biases and root-mean-square
errors in the calculated brightness temperature</span><span style="font-size:10.0pt">.</span><a name="_GoBack"></a><span style="font-size:11.0pt;font-family:"Arial","sans-serif""></span></p>
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<p class="MsoNormal" style="text-align:right" align="right"><b style><span style="font-size:14.0pt">Remote Access</span></b></p>
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<p class="MsoNormal" style><b style><span style="font-size:11.0pt;font-family:"Arial","sans-serif"">Video:</span></b><span style="font-size:11.0pt;font-family:"Arial","sans-serif""> 1.</span> <span style="font-size:11.0pt;font-family:"Arial","sans-serif"">Go to </span><a href="https://star-nesdis-noaa.webex.com/"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">JCSDA Seminar</span></a> and click on the seminar title<span style="font-size:10.0pt;font-family:"Arial","sans-serif""><br>
</span><span style="font-size:11.0pt;font-family:"Arial","sans-serif"">2. Enter your
name and email address. <br>
3. Enter the meeting password: JCSDAseminars707<br>
4. Click "Join Now". <br>
5. Follow the instructions that appear on your screen. <br>
<b style>Audio: </b>USA participants:
1-866-715-2479, Passcode: 9457557<br>
International:
1-517-345-5260</span><span style="font-family:"Arial","sans-serif""></span></p>
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<p class="MsoNormal" style="text-align:right" align="right"><b style><span style="font-size:14.0pt">Contact</span></b></p>
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<p class="MsoNormal" style>If you would like to
present a seminar contact <a href="mailto:George.Ohring@noaa.gov">George.Ohring@noaa.gov</a></p>
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<p class="MsoNormal" style="text-align:right" align="right"><b style><span style="font-size:14.0pt">Seminar File</span></b></p>
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<p class="MsoNormal" style>Slides available prior to,
and audio recording after, the presentation at <a href="http://www.jcsda.noaa.gov/JCSDASeminars.php">http://www.jcsda.noaa.gov/JCSDASeminars.php</a></p>
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