| 中国西北干旱区地-气温差变化成因分析 |
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| 引用本文： | 符睿,韦志刚,文军,李振朝.中国西北干旱区地-气温差变化成因分析[J].中国沙漠,2010,30(6):1442-1449. |
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| 作者姓名： | 符睿 韦志刚 文军 李振朝 |
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| 作者单位： | 1. 中国科学院,寒区旱区环境与工程研究所,西部气候环境与灾害重点实验室,甘肃,兰州,730000;云南省气象局,气象科学研究所,云南,昆明,650034;季风与气象灾害研究开放实验室,云南,昆明,650034
2. 中国科学院,寒区旱区环境与工程研究所,西部气候环境与灾害重点实验室,甘肃,兰州,730000 |
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| 基金项目： | 国家重点基础研究发展计划项目，国家自然科学基金，中国科学院知识创新工程重要方向项目 |
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| 摘 要： | 利用1961—2000年中国西北干旱区49个气象台站百叶箱气温、0cm地温、降水和近地层风速月平均资料,以及NCEP/NCAR再分析月平均资料,分析了我国西北干旱区地-气温差变化的原因。结果表明,20世纪后40a西北干旱区冬季地-气温差呈减小趋势,其可能原因是20世纪80年代后全球进一步变暖,西北干旱区对流层中层高度场升高、气温升高,风场易出现反气旋式环流距平,寒潮活动减少,近地层风速减弱使得气温增暖高于地温。而春初对流层中层高度场偏低时,气温偏低,降水偏多,风场易出现气旋式环流距平,近地层风速减弱使得气温增暖低于地温,所以春初地-气温差呈上升趋势。
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| 关 键 词： | 西北 干旱区 地-气温差 降水 近地层风速 环流 |
| 收稿时间： | 2009-9-15 |
| 修稿时间： | 2009-12-15 |
Causes of Variation of Earth-Air Temperature Difference in Arid Regions of Northwest China |
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| FU Rui,WEI Zhi-gang,WEN Jun,LI Zhen-chao.Causes of Variation of Earth-Air Temperature Difference in Arid Regions of Northwest China[J].Journal of Desert Research,2010,30(6):1442-1449. |
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| Authors: | FU Rui WEI Zhi-gang WEN Jun LI Zhen-chao |
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| Institution: | 1.Laboratory for Climate Environment and Disasters of Western China, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; 2.Meteorological Sciences Institute of Yunnan Province, Kunming 650034, China; 3.Laboratory for Monsoon and Meteorological Disaster Study, Kunming 650034, China |
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| Abstract: | Causes of variation of earth-air temperature difference(Ts-Ta) in arid regions of Northwest China were analyzed based on the monthly surface temperature, air temperature, precipitation and the wind speed data from 49 weather stations and NCEP/NCAR monthly reanalysis data from 1961 to 2000. The results showed that value of Ts-Ta exhibited a descent tendency in winter during the last 40 years of the 20th century. The reason is the global warming after the 1980s, increasing of height field and temperature, appearing of anticyclone circulation anomaly, decreasing of cold wave activities and wind speed at the surface layer all caused more increase of the air temperature than earth temperature. In early spring, the height field in middle troposphere reduced, and air temperature and precipitation increased, and cyclone circulation anomaly appeared in wind fields, and the wind speed at surface layer decreased to air temperature increased less than surface temperature, so Ts-Ta exhibited a escalation tendency. |
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| Keywords: | arid region Northwest China earth-air temperature difference precipitation wind speed at the surface layer circulation |
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