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| 1971-2010年三江源地区干湿状况变化的空间特征 | |
| 引用本文： | 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. |
| 作者姓名： | 徐维新 古松 苏文将 江莎 校瑞香 肖建设 张娟 |
| 作者单位： | 1. 中科院西北高原生物研究所,青海西宁810001;青海省气象科学研究所,青海西宁810001 2. 南开大学生命科学学院,天津300071;中科院西北高原生物研究所,青海西宁810001 3. 青海省气象科学研究所,青海西宁,810001 4. 南开大学生命科学学院,天津,300071 |
| 基金项目： | 国家自然科学基金项目，高原气象开放基金项目，干旱气象基金项目 |
| 摘 要： | 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。 |
| 关 键 词： | 三江源 湿润指数 气候变化 |
| 收稿时间： | 2011-05-18; |
Spatial pattern and its variations of aridity/humidity during 1971 -2010 in Three-River Source Region on the Qinghai- Tibet Plateau |
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| XU Wei-xin , GU Song , SU Wen-jiang , JIANG Sha , XIAO Rui-xiang , XIAO Jianshe , ZHANG Juan.Spatial pattern and its variations of aridity/humidity during 1971 -2010 in Three-River Source Region on the Qinghai- Tibet Plateau[J].Arid Land Geography,2012,35(1):46-55. | |
| Authors: | XU Wei-xin GU Song SU Wen-jiang JIANG Sha XIAO Rui-xiang XIAO Jianshe ZHANG Juan |
| Institution: | 1 Northwest Institute of Plateau Biology,Chinese Academy of Sciences,Xining 810001,Qinghai,China; 2 Meteorological Institute of Qinghai Province,Xining 810001,Qinghai,China;3 Nankai University,College of Life Sciences,Tianjin 300071,China) |
| Abstract: | The 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. |
| Keywords: | Three-river Source region humidity index climate change |
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