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Amospheric Data Assimilation


In an operational data assimilation system (DAS), an optimization procedure is performed at every point on the grid of points that we use to model the atmosphere (on the order of millions) and the number of observations involved, which is several hundred thousand per day. To perform these calculations efficiently and within the capabilities of any present day computer requires the use of sophisticated mathematical algorithms. The entire process is called objective analysis.


The GEOS-5 DAS incorporates the GEOS-5 atmospheric general circulation model and the Gridpoint Statistical Interpolation (GSI) analysis developed jointly with NOAA/NCEP/EMC.





GEOS-5 DAS quick start guide.

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