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Pure and Applied Geophysics

, Volume 175, Issue 10, pp 3653–3670 | Cite as

Assessment and Adaptive Correction of Observations in Atmospheric Sounding Channels of the Satellite Microwave Radiometer MTVZA-GY

  • Dmitry Gayfulin
  • Michael Tsyrulnikov
  • Alexander Uspensky
Article
  • 53 Downloads

Abstract

The microwave radiometer MTVZA-GY on board the Russian polar orbiting meteorological satellite Meteor-M N2 is briefly described. Errors and biases in antenna brightness temperatures are documented. Observation errors are found to be dependent on the solar angles. An adaptive bias correction technique for MTVZA-GY antenna temperatures is motivated and developed. The technique accounts for the solar angles and sequentially assimilates observed minus simulated radiances in a perpetual 24 h cycle in order to estimate up-to-date correction coefficients defined to be functions of the zenith and azimuth solar angles. The simulated radiances are computed by the RTTOV radiative transfer model from three-dimensional numerical weather prediction fields. The correction technique is implemented for atmospheric temperature and humidity sounding channels of MTVZA-GY. The corrected observations are shown to be significantly more accurate as compared with raw antenna temperatures and with observations that undergo simpler and more traditional corrections. The accuracy of corrected MTVZA-GY observations is compared with the accuracy of AMSU-A and MHS data.

Keywords

Satellite observations microwave radiances bias correction data assimilation 

Notes

Acknowledgements

The authors would like to thank I. V. Cherny for valuable discussions on various MTVZA-GY calibration issues. We are indebted to P. Rayer for extending the RTTOV model to include MTVZA-GY. S. A. Uspensky and N. S. Ekimov kindly provided raw data files and helped resolve technical issues with the files. We are also grateful to P. I. Svirenko, who provided us with the sparse-matrix conjugate gradient solver from the meteorological data assimilation system of the Hydrometcenter of Russia. The very helpful comments made by the two anonymous reviewers are gratefully acknowledged.

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  • Dmitry Gayfulin
    • 1
  • Michael Tsyrulnikov
    • 1
  • Alexander Uspensky
    • 2
  1. 1.Hydrometeorological Center of RussiaMoscowRussia
  2. 2.State Research Center “Planeta”MoscowRussia

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