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A one-year statistical comparison of the Hough and OI data assimilation systems
  • Published Date:
    1980
Filetype[PDF - 1.55 MB]


Details:
  • Personal Authors:
  • Corporate Authors:
    National Meteorological Center (U.S.)
  • Description:
    "This report addresses the question, "How much difference has the use of the optimum interpolation (OI) analysis system made in the meteorological performance of the NMC data assimilation system (i.e., the Final Cycle)"? We are able to present only a partial answer to the question, an answer based on a comparison of the fit of analysis and first-guess fields, to Northern Hemisphere radiosonde observations. In 1977, a routine procedure was instituted to evaluate the fit of the Final Cycle analysis and first guess fields to observations at several networks of radiosonde stations. At that time, the Final Cycle analysis system used the Hough function, spectral method. In September of 1978, the OI analysis system was implemented in the Final Cycle. The evaluation code, called SUMAC, has now been run for more than 2 years. We shall focus upon the comparison afforded by 22 months of data, Oct. 77- Aug. 78 and Oct. 78-Aug. 79, on two observation networks, North America (NA) and Northern Hemisphere (NH). For a description of the method used to compile these statistics, the reader is referred to Office Note No. 197 by Dey and Caporaso (1979). The variables that have been studied are wind speed, geopotential height and temperature at the four pressure levels, 850, 500, 250, and 100 mbs. We will present the results in that order, and will close with a summarization and outlook."--Introduction.

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