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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:20.0pt;font-family:"Arial","sans-serif"">Hybrid Data Assimilation without Ensemble Filtering</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:16.0pt;font-family:"Arial","sans-serif"">Ricardo Todling <br>
NASA/Global Modeling and Assimilation Office</span></b><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">Date, Time & Place</span></b></p>
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<p class="MsoNormal" style><b style><span style="font-size:16.0pt;font-family:"Arial","sans-serif"">Wednesday, January 16, 2013<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:10.0pt;font-family:"Arial","sans-serif";color:#046312" lang="X-NONE">The Global Modeling and Assimilation Office (GMAO) is close to
upgrading its system with a hybrid-ensemble analysis. Initially this effort has
followed the pathway taken by the National Centers for Environmental
Prediction (NCEP) in adding to its three-dimensional variational (3d-Var)
analysis a 3d ensemble Kalman filter (EnKF). The EnKF provides an ensemble of
analyses used to generate an ensemble of backgrounds for the hybrid
Grid-point Statistical Interpolation (GSI) analysis. Two steps link the EnKF
with GSI: re-centering of the ensemble members around the GSI analysis; and
addition of inflating errors to the re-centered ensemble analyses to mimic
the effect of model error. At first GMAO avoided this latter step given it is
theoretically difficult to justify it. Under re-centering only, we quickly
found there was no clear benefit from the hybrid approach; with additive
inflation, the hybrid strategy surely brought in the expected improvements. The
key role played by these additive perturbations, created from 48-minus-24
hour forecast differences, led us to consider a situation where an ensemble
of analyses is generated by simply adding these perturbations to the central
analysis. This presentation compares this alternative to the original
implementation. The proposed scheme leads to computational savings and avoids
need to maintain two analysis systems.</span><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/mw0305l/mywebex/default.do?siteurl=star-nesdis-noaa"><span style="font-size:11.0pt;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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