气象遥感资料变分校准方案改进及应用试验

An Improved Scheme of Variation Correcting for Remote Sensing Data and Its Application

针对常见气象遥感资料变分校准方案的不足,提出了一个改进方案。该方案不需要将校准参照量插值到遥测资料的格点上,既避免了对稀疏的校正参照量进行客观分析的困难,也避免了校正参照量稀缺区域不准确插值分析带来的不利影响,使遥感资料的整体偏差得到修订的同时,能够更好地保持遥测资料的空间分布形态不变。利用国家卫星气象中心通过9210下发的ATOVS反演产品进行了试验,结果表明改进方案校准效果好;并将校准后的ATOVS反演资料用于Grapes三维变分同化系统,应用试验表明校准后的ATOVS反演资料在三维变分同化系统中具有应用价值。

Because of the disadvantage of the existing scheme of variational correcting for remote sensing data, an improved scheme was brought up. In the new scheme, it is not necessary that the correction reference value would be interpolated to the grid of remote sensing data. Therefore, the difficulty of objective analysis and the bad impact of interpolation errors can be avoided in the region of reference value lack. By means of the scheme, the errors of remote sensing data can be reduced evidently while its spatial pattern is held. Some tests were performed to correct the ATOVS retrieved data from the National Satellite Meteorological Center, and the results show that the improved scheme is better in correcting remote sensing data. The ATOVS retrieved data corrected are put to use in Grapes-3Dvar system, and have proved applicable by the application experiment.