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大气科学  2006 

雷达径向风资料的四维变分同化试验

DOI: 10.3878/j.issn.1006-9895.2006.03.07

Keywords: 声雨滴谱仪,雨滴谱,层状云,对流云

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Abstract:

在MM5四维变分同化系统(MM54D-Var)的基础上开发出雷达径向风资料的同化模块,利用改进后的同化系统对2002年7月22日湖北宜昌多普勒雷达的径向风观测资料进行四维变分同化试验,分析雷达径向风资料的同化对中尺度数值模式初始场的调整以及对中尺度强降水模拟的影响.研究结果表明,同化雷达径向风资料加强了中尺度对流系统低层100km左右范围内的风场辐合.调整后的风场具有更明显的β中尺度特征.利用14min的雷达径向风资料可以改进3h之内的强降水模拟,尤其是对雷达站东南侧强降水的模拟.

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