青藏高原植被变化对中国东部夏季降水影响的模拟研究  

Numerical Simulation of Impact of Vegetation in Qinghai-Xizang Plateau on Summertime Precipitation in Eastern China

作　　者：张少波[1,2] 陈玉春[1] 吕世华[1] 李锁锁[1] 王少影[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所寒旱区陆面过程与气候变化重点实验室,甘肃兰州730000 [2]中国科学院大学,北京100049

出　　处：《高原气象》2013年第5期1236-1245,共10页Plateau Meteorology

基　　金：国家科技支撑计划课题(2007BAC29B04);国家重点基础研究发展计划(2010CB950503);中国科学院"西部博士"资助项目;中国科学院寒旱区陆面过程与气候变化重点实验室开放基金项目(LPCC201101)

摘　　要：利用耦合了陆面模式CLM3.5的区域气候模式RegCM4.1.1对中国2000-2009年夏季东亚环流及降水进行模拟试验,从而研究青藏高原植被退化对中国东部夏季降水的影响。结果表明,该模式能较好地模拟出东亚地区夏季位势高度场的平均特征及西太平洋副热带高压位置和强度的时间演变,并对中国东部地区降水也具有一定的模拟能力,但模拟的西太平洋副热带高压中心强度偏小,地面温度和降水场也存在一定的偏差。青藏高原植被退化后,该地区对流层中层的潜热加热作用减小,受西风带纬向平流作用影响,中国东部地区上空出现温度和位势高度负异常,导致南亚高压偏西和西太平洋副热带高压减弱;受低层水汽输送的异常分布影响,中国南方和东北地区降水增加,北方地区降水减少。Using the regional climate model （RegCM4. 1. 1--CLM3.5）, East Asian summer monsoon and precipitation over China during 2000 to 2009 were simulated. After the examined with reanalysis data and observation records, the model was used to study the effect of vegetation over the Qinghai-Xizang Plateau （QXP） on summertime precipitation in the eastern China. The result shows that the model can well reveal the averaged summer characteristics of 500 hPa geopotential height and the time evolution of western Pacif- ic subtropical high, and it can also partly reproduce the summertime precipitation over Eastern China. However, the simulated western Pacific subtropical high seems weaker on the sea and there is also a cer- tain deviation for the surface air temperature and precipitation. When the vegetation over the QXP changes worse, latent heating effect in the middle of troposphere above the QXP decreased obviously. Because of the zonal temperature adveetion, minus deviations of temperature and geopotential height are found in the upper troposphere, leading to a westward extending of south Asia high and a weakening of western Pacific subtropical high. As a result, due to the abnormal distribution of water vapor transmission of lower tropo- sphere, precipitation in southern and northeastern China increases while that in northern China decreases.

关 键 词：RegCM4 1 1模式 植被变化 降水 数值模拟 

分 类 号：P435.2[天文地球—大气科学及气象学]