Mesoscale Parallel Experiment Change Log

Experiment Name:  Eta-32 with new radiance processing

When Who What
2002/03/11/12 Parrish
  • Fixed 3dvar code errors so that the new radiance channels would be correctly processed. Bias corrections were spun up from zero and the Cycled EDAS restarted from ETAV control run.
  • 2002/03/15/12 Keyser, Parrish, Rogers
  • Modified 3dvar code so that it would use GOES radiances over land. Added prepbufr generation job to the parallel with modified parameter cards so that over-land GOES radiances would be turned on in the prepbifr file.
  • 2002/03/16/00 Parrish
  • A small bug was uncovered in the test 3dvar with new radiance processing. An index was off by one, having a small impact on two of the scan-angle dependent radiance bias correctors. It has been corrected in all parallels currently testing the new 3dvar. This problem is not present in the operational code.
  • 2002/03/18/12 Rogers
  • Fixed a script error which was causing the overland GOES radiances to be used in the 12Z cycle only.
  • 2002/04/12/00 Parrish, Rogers
  • Turned on use overland GOES precipitable water retrieval data in the eta 3DVAR analysis.
  • 2002/04/15/12 Parrish
  • Turned off use of GOES/TOVS radiances over land
  • 2002/04/16/12 Parrish, Rogers
  • Since the parallel is no longer using overland GOES radiances, job reverts to using the production EDAS/Eta prepbufr files.
  • 2002/04/18/12 Parrish
  • In order to successfully process radiance data for the regional reanalysis, it was necessary to be more aggressive with the evolution of the bias correction. The changes to the radiance processing make the 3dvar more robust, especially when starting a new experiment, when the bias correction is unknown, and some spinup was required. The new version does a spinup automatically every analysis, even though this is redundant most of the time.

    is iterated 5 times, with observation error and QC limits mutiplied by factors of 5,4,3,2,1 for each iteration. The bias correction is estimated after each pass without going through the entire analysis. This correction is blended with a running average of the input bias correction, with a 1/e time of 15 days. This becomes the new guess bias correction. The analysis bias correction is then generated the same as before. There is also a fixed bias file, which used to be the file eta_satangbias_16_new.txt. This file is no longer used. The fixed bias numbers are now allowed to evolve with a 1/e time of 30 days. They are running means of a mean lapse rate of the background for each channel, and mean difference of obs - guess brightness temperature for each scan angle of each channel.

    The format of the files "satbias_in" and "satbias_out" has been changed to contain all the information necessary for doing running means of the bias coefficients and the angle dependent biases. Each channel is processed independently, and there is a "model id" which is a unique number generated from resolution and position parameters, so that if the model is changed, the file will be reset to zero automatically by the analysis.

    The cycled EDAS was restarted from the 32-km control run (ETAV)

  • Page Last Modified: April 19, 2002