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大气科学  2009 

耦合不同陆面方案的WRF模式对2007年7月江淮强降水过程的模拟

DOI: 10.3878/j.issn.1006-9895.2009.03.13

Keywords: WRF模式,暴雨模拟,陆面方案,城市下垫面

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Abstract:

利用WRF模式,分别选用不同陆面参数化方案(SLAB、RUC、NOAH、UCM)对2007年7月7~8日的江淮暴雨进行数值模拟试验,模拟结果的对比分析表明:虽然主要雨带的基本位置和大致走向受陆面方案的影响并不大,但是降水强度的分布对陆面物理过程是敏感的,耦合陆面方案比不耦合陆面方案的模拟效果更接近实况;不同陆面方案模拟的降水量均较实况偏小,然而由于考虑的要素和物理过程存在一定差异,它们对降水的中心落点、雨量值、降水日变化、降水类型以及降水条件的模拟各有所长;特别值得指出,TRMM资料与4种方案的模拟结果均反映出本次降水日变化过程中夜间的峰值特征,这是短时降水(1~3h)和持续性降水(≥6h)的综合反映,而凌晨后的降水则主要由持续性降水造成;在各种试验的综合比较中,NOAH方案较其他方案的模拟结果显得更稳定与合理,UCM方案针对城市下垫面的模拟有一定优越性。

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