1971 - 2010 年三江源地区干湿状况变化的空间特征
徐维新; 古松; 苏文将; 江莎; 校瑞香; 肖建设; 张娟
Source Publication干旱区地理
Abstract依据1971 - 2010 年地面观测气象数据,计算了三江源地区湿润指数。利用经验正交函数分解( EOF) 和偏相关系数,对近40 a 三江源地区干湿状况变化的时空特征及其影响因素进行了分析。结果表明: 三江源地区干湿状况的变化在其北部与南部、东部与西部间存在明显反相位变化特征。北部和东部的部分区域分别在20 世纪90 年代和21 世纪后表现出气候湿润化趋势,其余大部地区的持续干旱化趋势始于20 世纪80 年代初,其中南部与西部变干趋势显著,其湿润指数线性趋势率达到- 8% /10 a。虽然三江源地区干湿状况主要决定于降水量和相对湿度的变化,但20 世纪90 年代中期后气温的显著上升,使得气温也成为关键的影响因子之一,即使在降水明显增加的背景下,也引起三江源主体区域湿润指数的明显下降。气候变暖情景下,北部和东部地区在近十几年暖湿化趋势明显,其余大部地区表现为不同程度的暖干化趋势。
Other AbstractThe Three-River Source Region ( TRSR) ,the source region of Yangtze River,Yellow River and Mekong
River,is located in the hinterland of the Qinghai - Tibetan Plateau. With a typical continental plateau climate and
alpine vegetation ecosystem,the water 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 Meteorological
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 Orthogonal Function
( 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 after
1990s and 21st 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 certain extent in most area of TRSR.
Keyword三江源 湿润指数 气候变化
Subject Area生物科学
Indexed ByCSCD
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Document Type期刊论文
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GB/T 7714
徐维新,古松,苏文将,等. 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.
APA 徐维新.,古松.,苏文将.,江莎.,校瑞香.,...&张娟.(2012).1971 - 2010 年三江源地区干湿状况变化的空间特征.干旱区地理,35(1),46-55.
MLA 徐维新,et al."1971 - 2010 年三江源地区干湿状况变化的空间特征".干旱区地理 35.1(2012):46-55.
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