COSMIC资料在GRAPES全球三维变分同化系统的初步研究

利用COSMIC获得的GPS无线电掩星数据所反演得到的大气温湿度廓线资料，在GRAPES全球三维变分同化系统中做连续循环同化试验，研究了加入COSMIC资料后得到的GRAPES分析场及其5天中期预报是否有所改善。研究结果表明：通过加入COSMIC资料连续循环同化得到的分析场，相对原来没有加COSMIC资料连续同化出来的GRAPES分析场有明显改善，由此GRAPES全球模式全球5天中期预报水平有明显提高，其中加入没有稀疏化后COSMIC资料对南半球GRAPES分析场的改善以及GRAPES全球模式5天中期预报水平的提高都比较显著；加入稀疏化后的COSMIC资料对北半球GRAPES分析场的改善以及GRAPES全球模式5天中期预报水平的提高都有比较显著的效果。

PRELIMINARY STUDY OF THE USE OF COSMIC DATA IN THE GLOBAL 3-DIMENSIONAL VARIANCE ASSIMILATION SYSTEM OF GRAPES

The profiles of atmospheric temperature and humidity as retrieved from GPS radio occultation data which are obtained with COSMIC are used to perform continuous and cyclic assimilation experiments in the global three-dimensional variance system of the GRAPES. By incorporating the COSMIC data, the aim of the study is to see whether the analysis field of GRAPES and its five-day medium-term forecast can be improved. As shown in the study, the analysis field determined with the addition of continuous and cyclic ...