干旱区地理2012，Vol.35Issue(1)：46-55,10.
1971-2010年三江源地区干湿状况变化的空间特征
Spatial pattern and its variations of aridity/humidity during 1971 -2010 in Three-River Source Region on the Qinghai -Tibet Plateau
摘要
Abstract
The Three-River Source Region River, is located in the hinterland of the Q alpine vegetation ecosystem, the water and （ TRSR）, the source region of Yangtze River, Yellow River and Mekong inghai -Tibetan Plateau. With a typical continental plateau climate and heat matching is a key to vegetation variation over region. In this study, monthly humidity indexes in TRSR were computed using ground-observed monthly air temperature, precipitation, wind speed, relative humidity and air pressure from 1971 -2010, based on the method of Ecological and Meteoro- logical Monitoring Standard which recommended by China Meteorological Bureau. The spatio-temporal variation of aridity/humidity conditions and its dominated factor were analyzed using the method of Empirical Orthogor/al Func- tion （EOF）, linear correlation and partial correlation analysis. The results show a clear of opposite mode in the zone of northern toward southern and western toward eastern in TRSR. It was found that there is a wet tendency af- ter 1990s and 21~＇ century in the zone of northern and eastern respectively, but a continual dry tendency since 1980s, especially in the zone of southern and western with a remarkable decreased trend （ -8%/10a）, occurred in other area of TRSR. Aridity/humidity conditions are controlled by precipitation and relative humidity in generally, but the situation is changed evidently after Mid-1990s in the most area of TRSR due to a significant warming, and temperature plays a key of factor to dominate a decreased trend of humidity index even if precipitation increases markedly since then. Under a scenarios of climate warming, it shows a tendency of heat and wet obviously in the zone of northern and eastern and heat and aridity in a ~rt~in ,=~t,~nt ; t ~ rr~o关键词
三江源/湿润指数/气候变化Key words
Three-river Source region/humidity index/climate change分类
天文与地球科学引用本文复制引用
徐维新,古松,苏文将,江莎,校瑞香,肖建设,张娟..1971-2010年三江源地区干湿状况变化的空间特征[J].干旱区地理,2012,35(1):46-55,10.基金项目
国家重点基础研究发展计划(973计划)项目(2007CB411507),冰冻圈科学国家重点实验室开放基金项目(SKLCS08-05)联合资助 （973计划）
