MERRA-2

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min-height:99.9%;"> <ul> <li><a href="/reanalysis/MERRA-2/" id="index_ln1" style="color:midnightblue;">MERRA-2 Project</a></li> <li><a href="/reanalysis/MERRA-2/data_access/" id="index_ln2">Data Access</a></li> <li><a href="/reanalysis/MERRA-2/citing_MERRA-2/" id="index_ln2b">Citing MERRA-2 Data</a></li> <li><a href="/reanalysis/MERRA-2/docs/" id="index_ln3">Documentation</a></li> <li><a href="/reanalysis/MERRA-2/WMO_climate_reanalysis/" id="index_ln3">WMO Climate Reanalysis</a></li> <li><a href="/reanalysis/MERRA-2/MERRA-2_AMIP/" id="index_ln3b">MERRA-2 AMIP</a></li> <li><a href="/reanalysis/MERRA-2/highlights/" id="index_ln4">Highlights</a></li> <li><a href="/reanalysis/MERRA-2/images/" id="index_ln5">Images</a></li> <li><a href="/reanalysis/MERRA-2/videos/" id="index_ln6">Videos</a></li> <li><a href="/reanalysis/MERRA-2/FAQ/" id="index_ln7">FAQ</a></li> <li><a href="/reanalysis/MERRA-2/pubs/" id="index_ln8">Publications</a></li> <li><a href="/reanalysis/MERRA-2/mailing_list/" id="index_ln9">Mailing List</a></li> <li><a href="/reanalysis/MERRA-2/usage/" id="index_ln10">User Metrics</a></li> <li><a href="/reanalysis/MERRA-2/diag_feedback.php" id="index_ln11">Diagnostic Feedback</a></li> <li><a href="/reanalysis/" id="index_ln12">GMAO Reanalysis Page</a></li> </ul> </div>  </div> <a name="skipping" id="skipping"></a> <div id="content-wrapper"> <div class="maincontent" id="leftnavOneColumn"> <h2>Modern-Era Retrospective analysis for Research and Applications, Version 2</h2> <div class="full-width-content-item"> <div class="divClear"></div> </div> <div style="height:auto; min-height:470px; margin-top:10px;"> <a name="top"></a> <h3>Project Overview</h3> <p style="margin-top:5px;">The Modern-Era Retrospective analysis for Research and Applications, Version 2 (MERRA-2) provides data beginning in 1980. It was introduced to replace the original MERRA dataset because of the advances made in the assimilation system that enable assimilation of modern hyperspectral radiance and microwave observations, along with GPS-Radio Occultation datasets. It also uses NASA's ozone profile observations that began in late 2004. Additional advances in both the GEOS model and the GSI assimilation system are included in MERRA-2. Spatial resolution remains about the same (about 50 km in the latitudinal direction) as in MERRA. </p> <p>Along with the enhancements in the meteorological assimilation, MERRA-2 takes some significant steps towards GMAO鈥檚 target of an Earth System reanalysis. MERRA-2 is the first long-term global reanalysis to assimilate space-based observations of aerosols and represent their interactions with other physical processes in the climate system. MERRA-2 includes a representation of ice sheets over (say) Greenland and Antarctica. </p> <div style="width:100%; text-align:center; margin-top:0px; margin-left:0px;"><img src="/images/merra2-logo-531.png" alt="MERRA-2 patch" style="padding:10px;" /> </div> </div> </div>   </div> </div> <div class="divClear"></div> <div id="footer"> <div> <a href="https://www.nasa.gov" class="imageLink"><img src="/images/nasa-logo.svg" alt="NASA Logo, National Aeronautics and Space Administration" height="85" style="margin-left: 20px;" /></a> </div>  <div id="footer-signature"> <a href="https://science.gsfc.nasa.gov/earth/" class="imageLink"><img src="/images/ESD-logo.png" weight="230" height="47" alt="Earth Sciences" /></a> </div> <div class="nasafootlinks"id="footerLeft"> <ul> <li>Responsible NASA Official : <br />  <a href="mailto:Steven.Pawson-1@nasa.gov">Steven Pawson</a></li> <li>Web Curator:  <br />  <a href="mailto:bennett.erdman@nasa.gov">Bennett Erdman</a></li> </ul> </div> <div class="nasafootlinks" id="footerRight" style="zoom:reset;"> <ul> <li> <a target="_blank" href="https://www.nasa.gov/about/highlights/HP_Privacy.html">Privacy Policy & Important Notices</a> </li> <li> <a target="_blank" href="https://www.nasa.gov/accessibility/">NASA's Accessibility Statement</a> </li> <li> <a href="/contact.php">Contact Us</a> </li> <li>Page Last Updated: 09/9/2022</li> </ul> </div> </div> </div> </div> </body> </html>

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MERRA-2