气溶胶直接效应对中国夏季降水影响的数值模拟研究

南京大学学报(自然科学版) ›› 2015, Vol. 51 ›› Issue (3): 587–.

气溶胶直接效应对中国夏季降水影响的数值模拟研究

吴明轩，王体健*，李树，庄炳亮

出版日期:2015-04-23 发布日期:2015-04-23
作者简介:(南京大学大气科学学院,南京,210023)
基金资助:
受国家重点基础研究发展计划(2011CB403406，2014CB441203),欧盟FP7项目REQUA(PIRSES-GA-2013-612671)

Numerical study of aerosol direct effect on summer precipitation in China

Wu Mingxuan, Wang Tijian *, Li Shu, Zhuang Binliang

Online:2015-04-23 Published:2015-04-23
About author:(School of Atmospheric Science, Nanjing University, Nanjing, 210023, China)

摘要/Abstract

摘要： 在东亚地区，气溶胶是一个重要的气候强迫因子，它与季风之间的相互作用具有很强的不确定性，利用数值模式进一步研究气溶胶与季风降水之间的关系十分必要。本文采用ICTP (International Centre for Theoretical Physics)第四代区域气候模式 (RegCM4)，通过两组对比试验和多年长期积分来研究气溶胶直接效应对中国夏季降水的影响。采用TRMM卫星降水资料和MODIS卫星气溶胶光学厚度资料评估了区域气候模式对中国夏季气溶胶和降水的模拟能力。总体来看，RegCM4能够再现我国夏季气候的主要特征，对我国夏季风环流和降水具有一定的模拟能力。气溶胶直接效应使得对流层温度降低，减弱了经向风环流，加强了位于20°N-30°N范围的上升气流和35°N以北地区的下沉气流，在我国东部引起了气旋式环流异常，并在110°E附近产生了速度接近1 m/s的北风增强。总降水量的变化呈现出“南多北少”的趋势。在季风区，对流性降水和非对流性降水分别减少了0.05 mm/Day和0.07 mm/Day，其中非对流性降水的相对变化较大。从各类型降水的日变化可以看出，降水的减少主要发生在夜间至凌晨时段。

Abstract: Aerosol is an important forcing influencing regional climate in East Asia. The interaction between aerosol and monsoon remain large uncertainty. It is necessary to further study relationship between aerosol and monsoon rainfall. In this paper, two experiments and 5 years run were conducted to investigate the impact of aerosol direct effect on summer precipitation in China using the regional climate model version 4 (RegCM4) from ICTP (International Centre for Theoretical Physics). Observational data including TRMM precipitation MODIS and aerosol optical depth was used to assess the performance of regional climate model in China. Generally, RegCM4 can reproduce the key feature of circulation and precipitation of summer monsoon in China. Our results show that, due to aerosol direct effect, troposphere temperature and meridional wind decreased. The updraft located between 20°N and 30°N and downdraft located on the north of 35°N was both intensified. There was a cyclonic circulation anomaly in eastern China, and there was about 1m/s northerly anomaly around 110°E. The total precipitation underwent a trend known as the southern flooding and northern drought. In the monsoon region, the convective precipitation decreased by 0.05 mm/Day and the non-convective precipitation decreased by 0.07 mm/Day. Note that the relative change of non-convective precipitation is larger than the change of the convective precipitation. As for the diurnal change of the precipitation, the reduction of precipitation occurred mainly during the night

吴明轩，王体健*，李树，庄炳亮. 气溶胶直接效应对中国夏季降水影响的数值模拟研究
[J]. 南京大学学报(自然科学版), 2015, 51(3): 587–.

Wu Mingxuan, Wang Tijian *, Li Shu, Zhuang Binliang. Numerical study of aerosol direct effect on summer precipitation in China[J]. Journal of Nanjing University(Natural Sciences), 2015, 51(3): 587–.

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