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Speeding up the GOES-R Legacy Atmospheric Sounding Algorithm: a Blend of the CRTM Forward Model and the Fast Analytical Jacobian Scheme

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Wednesday, 26 January 2011
Speeding up the GOES-R Legacy Atmospheric Sounding Algorithm: a Blend of the CRTM Forward Model and the Fast Analytical Jacobian Scheme
Washington State Convention Center
Xin Jin, NOAA/NESDIS, Camp Springs, MD; and J. Li, T. J. Schmit, S. Sampson, G. D. Martin, W. Wolf, and M. D. Goldberg

The computing time is always a concern when it comes to the 1D-VAR atmospheric profile sounding retrieval. The GOES-R Algorithm Working Group have selected the community radiative transfer model (CRTM) as the operational RTM which is associated with a very time-consuming K-Matrix method for Jacobian calculation. Here we present a method to mix the CRTM forward model with a fast analytical Jacobian method in the legacy profile sounding algorithm. The test with EUMETSAT's SEVIRI measurements shows that our efforts significantly speed up the calculation with a comparable precision.