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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:18pt;font-family:Arial,sans-serif">Correcting
for Position Errors in Variational 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">Thomas Nehrkorn</span></b></p>
<p class="MsoNormal"><i><span style="font-size:10pt;font-family:Arial,sans-serif">Modeling and Data
Assimilation Group, Atmospheric and Environmental Research, Inc (AER)</span></i></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">November
10, 2014, 2:00 pm – 3:00 pm</span></b><span style="font-size:11pt;font-family:Arial,sans-serif"><br>
</span><span style="font-size:10pt;font-family:Arial,sans-serif">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:10pt;font-family:Arial,sans-serif">Forecasts used in variational data
assimilation schemes for the atmosphere and ocean often exhibit significant
position errors. In standard data assimilation approaches position errors
often result in background errors that have complex error correlations, are
not normally distributed, and are particularly difficult to correct. A number
of approaches have been proposed to measure and correct position or phase
errors, ranging from techniques originating from image processing such as
"image warping" or "morphing" and "optical
flow," object-oriented verification measures, to alignment approaches
aimed at data assimilation improvements. </span></p>
<p style="background-image:initial;background-repeat:initial"><span style="font-size:10pt;font-family:Arial,sans-serif">We
present an implementation of a displacement scheme to correct phase errors
based on the feature calibration and alignment (FCA). In its original formulation,
a set of two-dimensional displacement vectors is applied to forecast fields
to improve the alignment of features in the forecast and observations. These
displacement vectors are obtained by a nonlinear minimization of a cost
function that measures the misfit to observations, along with a number of
additional constraints (e.g., smoothness and non-divergence of the
displacement vectors) to prevent unphysical solutions. Results from this
implementation will be compared with a more recent implementation within the
WRF-Var (WRFDA) algorithm, in which the nonlinear minimization is replaced by
the (linear) conjugate gradient inner-loop minimization combined with outer
loop nonlinear adjustments, and the ad-hoc penalty function constraints are
replaced by an error-covariance representation of the displacement vectors.</span>
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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:10pt;font-family:Arial,sans-serif">JCSDA Seminar</span></i></a><i> and click on the seminar title</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 your name and email address. <br>
3. No password is necessary<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">If you would like to
present a seminar contact <a href="mailto:Erin.Jones@noaa.gov">Erin.Jones@noaa.gov</a></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">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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</tbody></table></div><div><br></div>-- <br><div class="gmail_signature"><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"><b>STAR Front Office: 301-683-3485 </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>
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