祁连山山区空中水汽分布特征研究  

RESEARCH ON ATMOSPHERIC WATER-VAPOR DISTRIBUTION OVER QILIANSHAN MOUNTAINS

作　　者：张强[1] 张杰[1] 孙国武[1] 狄潇泓[2] 

机构地区：[1]中国气象局兰州干旱气象研究所 [2]兰州中心气象台,兰州730020

出　　处：《气象学报》2007年第4期633-643,共11页Acta Meteorologica Sinica

基　　金：国家科技部"西部开发科技行动"重大项目(2004BA901A16);国家自然科学基金项目(40175004);甘肃省自然基金(3ZS051-A25-011)

摘　　要：将卫星遥感资料与探空资料和地面观测降水资料相结合,分析了祁连山山区空中水汽含量和云迹风的空间分布特征。并且,以此为基础,研究了祁连山大气水汽和地面降水的空间分布及其与大气环流和地形的关系。结果表明:祁连山大气水汽和地面降水受西风带、偏南季风(南亚季风和高原季风)和东亚季风的共同影响,在祁连山西北部大气水汽主要受西风带气流控制,在祁连山中南部偏南季风占主导地位;在祁连山的东北部则是东亚季风的影响比较明显。同时,祁连山大气水汽、降水和降水转化率与海拔高度和坡向以及环流影响区的关系均十分密切。一般,迎风坡上大气水汽含量在3500—4500 m海拔高度会出现一个峰值;而在背风坡上除东亚季风影响区外大气水汽含量只出现随海拔高度单调递减趋势,基本上不出现任何峰值。背风坡大气水汽含量总体上要比迎风坡少得多,最多大约能少4.49 kg/m2。无论是大气水汽含量、地面降水还是降水转化率均在东亚季风影响区最大;东亚季风影响区大气水汽含量在迎风坡上的峰值要更强,出现的海拔高度更低。Based on the remote sensing data, the radiosonde data and the precipitation data observed by weather stations, distributions of water-vapor in air and cloud motion winds in the Qilianshan Mountains are analyzed. Moreover, on the basis of water-vapor and cloud motion wind analyses, relations of atmospheric water-vapor distribution with precipitation, atmospheric circulation and terrain are investigated. The results show that distributions of atmospheric water-vapor and precipitation in Qilianshan Mountains are affected by the westerly belt, the southerly monsoon （the South Asian monsoon and Tableland monsoon） and the East Asian monsoon. In the northwest region of the Qilianshan Mountains, water-vapor and precipitation are entirely affected by the wester- ly belt flow, and there is no other direction water-vapor transport except westerly water-vapor flux, so, the northwest region is regarded as the westerly belt region. In the south and middle region of the Mountains, water-vapor is mainly controlled by the southerly monsoon, 37.7 % of the total water-vapor is from the south, especially in summer, the southerly water-vapor flux accounts for 55.9 % of the total, and furthermore the water-vapor content in the southerly flow is more than that in the westerly flow. The southerly monsoon water-vapor is influenced by the South Asian monsoon from the Indian Ocean and the tableland monsoon in the Qinghai-Tibet plateau, so, the south and middle region is called the southerly monsoon region. But in the northeast region of the Mountains, the East Asian monsoon is the main climate system affecting the water-vapor in this region, except west and northwest water-vapor fluxes, there are a lot of easterly water-vapor fluxes in summer. The frequency of easterly cloud-motion winds in summer half year accounts for 27.1% of the total, though the frequency is not too high, it is the main water-vapor source of summer precipitation in this region, therefore, the northeast region is a marginal region of East Asian monsoon. On the othe

关 键 词：卫星遥感资料 祁连山区 空中水汽 云迹风 大气环流影响系统. 

分 类 号：P315.5[天文地球—地震学]