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大气科学  2014 

ATOVS资料同化方案对暴雨模拟效果的影响

DOI: 10.3878/j.issn.1006-9895.1401.13215

Keywords: 暴雨,ATOVS,资料,变分同化,稀疏化,数值模拟

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Abstract:

本文利用WRF模式及其3DVar同化系统,以2009年6月29日00时到30日00时的湖北鹤峰暴雨为研究个例,对ATOVS探测器的AMSU-A、AMSU-B和HIRS三类资料进行了不同的同化方案试验。结果表明:同化ATOVS三类资料对暴雨模拟的影响不同,HIRS资料对暴雨模拟效果改进最大,AMSU-B次之,AMSU-A最小。同时同化ATOVS三类资料时,AMSU-A资料起主要作用,其同化效果与同时同化ATOVS三类资料相近,优化组合同化AMSU-B和HIRS资料的效果最好。同化ATOVS不同资料对初始要素场的影响不同,AMSU-A资料主要影响大气温度场,AMSU-B资料对中高空要素场的影响较大,HIRS资料对低空湿度场及风场的协同改变最有利于降水模拟的改善。同时ATOVS资料的稀疏分辨率也是影响同化效果的一个因子,在模式分辨率不变时,同化资料稀疏分辨率可能存在最佳选择。

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