Calculation of updated coefficients for atmospheric temperature retrieval

In order to calculate updated coefficients for atmospheric temperature retrieval from satellite sounding data and radiosonde data, it is necessary to form statistical samples of real radiance and radiosonde data matchups. A procedure is presented here for the data matchups. And a method of eigenvectors of statistical covariance matrices is used to produce updated coefficients for atmospheric temperature retrieval. The updated coefficients produced are tested using radiance observations from NOAA-7 satellite. Comparisons of these realtime retrieved data with radiosonde data show that the atmospheric temperature profiles retrieved have an accuracy of RMS 2–3 degrees (°C). In addition, the error sources are also discussed.