STMAS同化风廓线雷达对台风“利奇马”融合实况风场的改进分析

Improved Analysis of the Integration of Live Wind Field of Typhoon Liqima by STMAS Assimilation Wind Profile Radar

为分析STMAS(space-time multiscale analysis system)同化风廓线雷达对三维风场的改进效果,本文以GRAPES-MESO、GRAPES-GFS 2种预报场作为背景场,对STMAS系统融合浙江省及周边一定范围的L波段边界层风廓线雷达数据,进行4组对比试验。通过试验结果与探空雷达实况数据和EC(european meteorological center)再分析资料的对比分析发现:(1)STMAS中融合越多的风廓线雷达信息,融合后的结果改变越明显;(2)从本文试验时段内各时次各层次试验数据与探空雷达差异的平均值来看,以GRAPES-GFS为背景场的融合效果相对较好;(3)通过与探空雷达对垂直风速的对比发现,接入风廓线雷达的STMAS风速场比未接入的STMAS风速更接近实况值,同时STMAS风速场比EC再分析资料更接近探空实况。

In order to analyze the improvement of STMAS(space-time multiscale analysis system)assimilated wind profile radar on the three-dimensional wind field,this paper carried out four sets of comparative experiments using ST-MAS to fuse the L-band boundary layer wind profile radar data of Zhejiang province and surrounding areas,using the forecasting data GRAPES-MESO and GRAPES-GFS as background fields.By comparing the experiments results,EC(european meteorological center)reanalysis data and the sounding radar real data,results show that:(1)The more wind profile radar information fused in STMAS,the more changes in the results.(2)According to the difference be-tween the test data of each time and each level and the sounding radar real data in the test period,the fusion effect with GRAPES-GFS as background field is relatively good;(3)By comparing vertical wind speed with the sounding ra-dar,it is found that the STMAS wind speed field is closer to the real value when connecting wind profile radar,and the STMAS wind speed field is closer to the sounding radar data than the EC reanalysis data.