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<p class="MsoNormal">The Joint Center for Satellite Data Assimilation
calls your
attention to the following announcement about the Community Gridpoint
Statistical Interpolation (GSI) data assimilation system. </p>
<p class="MsoNormal">The Developmental Testbed Center (DTC) is pleased
to
announce the release of Version 2.0 of the Community Gridpoint
Statistical
Interpolation (GSI) data assimilation system. This is a significant
update to
the Community GSI release v1.0, including updates to the GSI code, GSI
Users'
Guide, online-tutorial and GSI website. The new code can be obtained at
<a href="http://www.dtcenter.org/com-GSI/users/downloads/index.php">http://www.dtcenter.org/com-GSI/users/downloads/index.php</a>
. </p>
<p class="MsoNormal">The GSI system was developed by NOAA’s
Environmental
Modeling Center and NASA’s Global Modeling and Assimilation Office.<span
style=""> </span>The number of groups involved in GSI
development has expanded to include NOAA’s Global Systems Division and
NCAR’s Mesoscale
and Microscale Meteorology Division. The DTC, sponsored by NOAA, the
U.S. Air
Force Weather Agency, the National Science Foundation, and the Federal
Aviation
Administration, is a distributed facility where the NWP community can
test and
evaluate new models and techniques for use in research and operations.<br>
<br>
This version GSI code is based on the NCEP's global implementation
version of
the GSI in December, 2009 (Q1FY10). The following is a list of new
functions
and changes included in the NCEP operational global implementation
version of
the GSI: <br>
• Assimilating tropical storm pseudo sea-level pressure
observations <br>
• Assimilating NOAA-19 HIRS/4 and AMSU-A brightness
temperature observations <br>
• Assimilating RARS 1B data <br>
• Assimilating NOAA-18 SBUV/2 and AURA OMI Ozone
observations. Monitor NOAA-19 and METOP-2 GOME Ozone observations <br>
• Assimilating EUMETSAT-9 Atmospheric Motion Vectors <br>
• Using uniform thinning mesh for brightness
temperature data <br>
• Improving assimilation of GPS radio occultation data
(forward operator, QC procedures, observation error tuning) <br>
• Adding dry mass pressure constraint <br>
• Using NASA Goddard Modeling and Assimilation
Office/EMC merged code including hooks for 4DVAR and Observation
Sensitivity <br>
• Updating background error covariance file <br>
Besides, this community GSI code contains enhanced community-friendly
features,
including <br>
• Updated configuration/compilation tools <br>
• Updated run script (under ./run) <br>
• New utilities to read and plot diagnostic files
(under ./util) <br>
The version has been tested by DTC on multiple platforms. Two new
platforms
(Mac and SGI) were added by the DTC with community contributions. The
following
lists the current supported platforms: <br>
• IBM: xlf <br>
• LINUX: pgi v7.0 and v8.0 <br>
• LINUX: Intel v10.0 and v11.0 <br>
• Mac OSX: PGI v8.0 <br>
• SGI Altix: Intel v10.0 <br>
A single case test was conducted on all supported platforms. Additional
testing
using the DTC regression suite was conducted on IBM and LINUX
platforms. <br>
<br>
The GSI Users' Guide has been updated with significant changes in
various
chapters (namelist options, run script, compilation/configuration,
diagnostics,
etc). The v2.0 of the GSI Users' Guide can be obtained at <a
href="http://www.dtcenter.org/com-GSI/users/docs/">http://www.dtcenter.org/com-GSI/users/docs/</a>index.php
. <br>
<br>
The online-tutorial of the GSI system was also updated and is available
at <a
href="http://www.dtcenter.org/com-GSI/users/tutorial/online_tutorial/index_v2.php">http://www.dtcenter.org/com-GSI/users/tutorial/online_tutorial/index_v2.php</a> .
<br>
<br>
More information regarding the community GSI system, documents, and
on-line
tutorial can be found on the DTC's GSI website at <a
href="http://www.dtcenter.org/com-GSI/users/index.php">http://www.dtcenter.org/com-GSI/users/index.php</a> .
<br>
<br>
For questions and comments, please send to DTC <a
href="mailto:gsi_help@ucar.edu">gsi_help@ucar.edu</a> . </p>
<p class="MsoNormal">This release is the result of the joint efforts of
NOAA/NCEP
and DTC through the support of NOAA, the U.S. Air Force Weather Agency
(AFWA),
and the National Science Foundation (NSF).</p>
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