兰州市空中水汽含量和水汽通量变化研究  

Trend Analysis of the Water Vapor Content and Its Transport over Lanzhou City

作　　者：刘世祥[1] 王遂缠[1] 刘碧 黄玉霞[1] 王有生[1] 蒲肃[1] 

机构地区：[1]甘肃省干旱气候变化与减灾重点实验室 [2]重庆市合川县官渡中学,重庆合川401541

出　　处：《干旱气象》2006年第1期18-22,共5页Journal of Arid Meteorology

基　　金：甘肃省气象局"甘肃省人工增雨防雹作业体系工程"(2001人影-1-1);科技部西部开发科技行动祁连山空中云水资源开发利用研究(2004BA901A16)共同资助

摘　　要：利用历年的高空和地面资料，深入分析了兰州市空中水汽含量和水汽通量的变化特征。结果表明：（1）夏季空中水汽含量和水汽输送相对较多，冬季相对较少；2—7月是水汽含量的增长期，9—1月是递减期，8月与7月持平；97％的水汽集中在400hPa以下；（2）兰州市空中水汽变化与降水量、降水日数、气温的变化有明显的一致性，也存在一定的差别；（3）兰州市空中水汽输送强度中心接近500hPa高度；冬季水汽日变化最大层位于700—600hPa，这与我国东部地区空中水汽输送高度和边界层水汽日变化特征有明显的区别。Based on the data of aerological and surface meteorological observation for many years, the trend of water vapor content and its transport over Lanzhou city were analyzed deeply. Results are as follows ： （ 1 ） The water vapor content and its transport are relatively more in summer than that in winter, and the water vapor content increases from Feb to Jul, decreases from Sep to Jan, and keeps invariable in Jul and Aug; nearly 97% water vapor content concentrates below the height of 400 hPa;（2）The trend of water vapor content distinctly corresponds to the change of precipitation, rainy days and temperature, but also there are some differences; （3）Over Lanzhou city, the large center of water vapor transport is near the height of 500 hPa, the maximum diurnal variation of water vapor is at the layer of 700 - 600 hPa in winter, and these are ohviously different from those over the east of China.

关 键 词：水汽含量 水汽输送 变化特征 

分 类 号：P426[天文地球—大气科学及气象学]