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Applications of an AMSR-E RFI detection and correction algorithm in 1-DVAR over land

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Abstract

Land retrievals using passive microwave radiometers are sensitive to small fluctuations in land brightness temperatures. As such, the radio-frequency interference (RFI) signals emanating from man-made microwave radiation transmitters can result in large errors in land retrievals. RFI in C- and X-band channels can contaminate remotely sensed measurements, as experienced with the Advanced Microwave Scanning Radiometer (AMSR-E) and the WindSat sensor. In this work, applications of an RFI detection and correction algorithm in retrieving a comprehensive suite of geophysical parameters from AMSR-E measurements using the one-dimensional variational retrieval (1-DVAR) method are described. The results indicate that the values of retrieved parameters, such as land skin temperature (LST), over these areas contaminated by RFI are much higher than those from the global data assimilation system (GDAS) products. The results also indicate that the differences between new retrievals and GDAS products are decreased evidently through taking into account the RFI correction algorithm. In addition, the convergence metric (χ2) of 1-DVAR is found to be a new method for identifying regions where land retrievals are affected by RFI. For example, in those regions with much stronger RFI, such as Europe and Japan, χ 2 of 1-DVAR is so large that convergence cannot be reached and retrieval results may not be reliable or cannot be obtained. Furthermore, χ 2 also decreases with the RFI-corrected algorithm for those regions with moderate or weak RFI. The results of RFI detected by χ 2 are almost consistent with those identified by the spectral difference method.

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Authors and Affiliations

  1. Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science & Technology, Nanjing, 210044, China

    Ying Wu  (吴 莹)

  2. School of Atmospheric Physics, Nanjing University of Information Science & Technology, Nanjing, 210044, China

    Ying Wu  (吴 莹)

  3. NOAA/NESDIS/Center for Satellite Application and Research, College Park, MD, 20742, USA

    Fuzhong Weng  (翁富忠)

Authors
  1. Ying Wu  (吴 莹)
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  2. Fuzhong Weng  (翁富忠)
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Correspondence to Ying Wu  (吴 莹).

Additional information

Supported by the National Natural Science Foundation of China (41305033, 41275043, and 41175035), Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institution, and NOAA/NESDIS/Center for Satellite Applications and Research (STAR) CalVal Program.

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Wu, Y., Weng, F. Applications of an AMSR-E RFI detection and correction algorithm in 1-DVAR over land. J Meteorol Res 28, 645–655 (2014). https://doi.org/10.1007/s13351-014-3075-x

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  • DOI: https://doi.org/10.1007/s13351-014-3075-x

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