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Advances in Atmospheric Sciences

, Volume 33, Issue 6, pp 659–672 | Cite as

Estimation and correction of model bias in the NASA/GMAO GEOS5 data assimilation system: Sequential implementation

  • Banglin ZhangEmail author
  • Vijay Tallapragada
  • Fuzhong Weng
  • Jason Sippel
  • Zaizhong Ma
Article
  • 77 Downloads

Abstract

This study presents a simplified multivariate bias correction scheme that is sequentially implemented in the GEOS5 data assimilation system and compared against a control experiment without model bias correction. The results show considerable improvement in terms of the mean biases of rawinsonde observation-minus-background (OmB) residuals for observed water vapor, wind and temperature variables. The time series spectral analysis shows whitening of bias-corrected OmB residuals, and mean biases for rawinsonde observation-minus-analysis (OmA) are also improved. Some wind and temperature biases in the control experiment near the equatorial tropopause nearly vanish from the bias-corrected experiment. Despite the analysis improvement, the bias correction scheme has only a moderate impact on forecast skill. Significant interaction is also found among quality-control, satellite observation bias correction, and background bias correction, and the latter positively impacts satellite bias correction.

Keywords

data assimilation model bias estimation and correction 

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Copyright information

© Chinese National Committee for International Association of Meteorology and Atmospheric Sciences, Institute of Atmospheric Physics, Science Press and Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Banglin Zhang
    • 1
    • 2
    Email author
  • Vijay Tallapragada
    • 2
  • Fuzhong Weng
    • 3
  • Jason Sippel
    • 1
    • 2
  • Zaizhong Ma
    • 4
  1. 1.I.M. System Group, Inc.College ParkUSA
  2. 2.NOAA NCEP Environmental Modeling CenterCollege ParkUSA
  3. 3.NOAA Center for Satellite Applications and ResearchCollege ParkUSA
  4. 4.NOAA Joint Center for Satellite Data AssimilationCollege ParkUSA

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