| 西北地区大气水汽的区域分布特征及其变化 |
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| 引用本文： | 王宝鉴,黄玉霞,陶健红,李栋梁,王鹏祥.西北地区大气水汽的区域分布特征及其变化[J].冰川冻土,2006,28(1):15-21. |
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| 作者姓名： | 王宝鉴 黄玉霞 陶健红 李栋梁 王鹏祥 |
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| 作者单位： | 中国气象局,兰州干旱气象研究所,甘肃省干旱气候变化与减灾重点实验室,甘肃,兰州,730020;中国气象局,兰州干旱气象研究所,甘肃省干旱气候变化与减灾重点实验室,甘肃,兰州,730020;甘肃省专业气象台,甘肃,兰州730020;兰州中心气象台,甘肃,兰州,730020;中国科学院,寒区旱区环境与工程研究所,甘肃,兰州,730000 |
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| 基金项目： | "西部开发科技行动"重大项目
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中国科学院知识创新工程项目 |
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| 摘 要： | 对西北地区大气水汽的区域分布及变化特征进行了分析. 结果表明: 受不同气候系统影响的西北地区可划分为西风带、高原区与东亚季风等3个气候影响区, 水汽沿西北、西方与西南3条路径输送到西北地区;东亚季风区是西北大气可降水量和水汽通量的最丰富区, 西风带区是次之, 高原区最少. 平均状况下, 高原区的边坡、东亚季风区、天山及祁连山等西北地区降水最大和次大中心维持水汽的辐合状态. 西风带区在1978年以前净水汽通量呈"亏损"状态, 之后维持"盈余"; 高原区净水汽通量一直为"亏损"状态; 东亚季风区90年代以前净水汽通呈"盈余"状况, 其后基本维持平衡, 且数值远大于其它区. 西风带区降水和大气水汽在变化过程中均有突变发生, 时间分别为1990年和1985年, 其它两区没有突变现象发生.
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| 关 键 词： | 大气可降水量 水汽通量 水汽收支 突变时间 西北地区 |
| 文章编号： | 1000-0240(2006)01-0015-07 |
| 收稿时间： | 08 29 2005 12:00AM |
| 修稿时间： | 10 8 2005 12:00AM |
Regional Features and Variations of Water Vapor in Northwest China |
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| WANG Bao-jian,HUANG Yu-xia,TAO Jian-hong,LI Dong-liang,WANG Peng-xiang.Regional Features and Variations of Water Vapor in Northwest China[J].Journal of Glaciology and Geocryology,2006,28(1):15-21. |
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| Authors: | WANG Bao-jian HUANG Yu-xia TAO Jian-hong LI Dong-liang WANG Peng-xiang |
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| Institution: | 1. Lanzhou Institute of Arid Meteorology, Chinese Meteorology Administration , and Key Laboratory of Arid Climatic Change and Reducing Disaster, Lanzhou Gansu 730020, China;2. The Professional Meteorological Observatory of Gansu Province, Lanzhou Gansu 730020, China ; 3. Lanzhou Central Meteorological Observatory, Lanzhou Gansu 730020, China ; 4. Cold and Arid Regions Environmental and Engineering Research Institute , Chinese Academy of Science, Lanzhou Gansu 730000, China |
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| Abstract: | Analyzing the regional features and variations of water vapor in Northwest China reveals that: There are three climate regions in Northwest China,i.e.,region of westerly belt,region of plateau and region of East Asian monsoon.Water vapor is transported from Northwest and West and Southwest to Northwest China.The atmosphere precipitable water and vapor flux in Northwest China is abundant in the region of East Asian monsoon,followed by the region of westerly belt,and then the region of plateau.In the vapor flux field there is a convergence center of precipitation.The net vapor flux was negative in the region of westerly belt before 1978,and then turns to positive.The net vapor flux was negative in the region of plateau during the past 43 years.Before the 1990s,the net vapor flux was positive in the region of East Asian monsoon,and then turns to an equilibrium state,with a value higher than the other two regions.There were abrupt changes of precipitation and water vapor in the region of westerly belt in 1990 and 1985,and no in the other two regions. |
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| Keywords: | atmosphere precipitable water vapor flux net water vapor flux abrupt-change time Northwest China |
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