A Comparative Analysis of Two Geopotential Height Field Reanalysis Datasets in Plateau
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Abstract:
Based on ERA40 and NCEPI (NCEP/NCAR version I) reanalysis datasets， the upperair observation datasets over the QinghaiXizang Plateau， and the data from the first Tibetan Plateau field experiment in 1979， the characteristics of geopotential heights over the QinghaiXizang Plateau are compared. Although there are some similarities， sensible differences among several reanalysis datasets are found. Comparatively speaking， the deviation of NCEPI reanalysis datasets from upperair observation datasets is the smallest， while that of ERA40 reanalysis datasets is the smallest over 200 hPa from 1980 to 1990 in the northern Plateau. Except that NCEPI reanalysis datasets are in better agreement with the upperair observation datasets over 200 hPa from 1980 to 1990， ERA40 reanalysis datasets are probably closer to reality on the interdecadal timescale in the central and southern Plateau. ERA40 reanalysis datasets show a better spatial similarity to the data from the first Tibetan Plateau field experiment than NCEPI reanalysis datasets．
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.