物理过程参数化方案对中国夏季降水日变化模拟的影响

doi:10.11867/j.issn.1001-8166.2008.11.1174

系统地分析了不同陆面过程、辐射传输以及积云对流参数化方案对区域气候模式模拟中国夏季降水日变化能力的影响，发现日内最大标准化降水及其出现时刻的模拟对不同模式物理过程的组合方案敏感。陆面过程、辐射传输参数化方案只影响降水强度的模拟，而对降水日变化形式和峰值出现时间模拟的影响较小, 降水日变化形式的模拟对积云对流参数化方案敏感且与模拟区域的选择关系密切。Grell方案对青藏高原东部、长江中游地区夏季降水的日变化特征具有较好模拟能力，Kuo和Anthes-Kuo方案较好地模拟出了东北、华南地区夏季降水的日变化特征，BM方案仅能模拟华南地区夏季降水的日变化特征。4种积云对流参数化方案均不能模拟出江淮—华北地区夏季降水日变化的双峰值结构。

关键词: 区域气候模式, 参数化方案, 降水日变化

The impacts of different convective cumulus, radiative transfer and land surface parameterization schemes on regional climate model′s performance in simulating diurnal cycle of the summer precipitation have been synthetically studied. The results show that land surface and radiative transfer schemes only influence the summer precipitation intensity, whereas they have less effects on the form of summer precipitation diurnal amplitude and the appearing time of precipitation maxima. However, the simulation of the summer precipitation diurnal cycle is very sensitive to the choice of convective cumulus schemes, whose skill are highly regime selective. The Grell scheme realistically captures the diurnal variations of the summer precipitation over east of Tibetan and middle Yangtze River valley. The Kuo and Anthes-Kuo schemes can well reproduce the diurnal cycle of the summer precipitation over Northeast and South China. The BM scheme only simulates the summer precipitation diurnal variations over South China. All of the four convective cumulus schemes can not simulate the two peaks of the summer precipitation diurnal cycle over Jianghuai and North China region.

Key words: Regional climate model, Physical process parameterization, Precipitation diurnal variation.

中图分类号:

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摘要

Impacts of Physical Process Parameterizations on Simulation of the Diurnal Variations of Summer Precipitation over China