| 西北东部气候异常特征及其对冬季高原感热的响应 |
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| 引用本文： | 赵庆云,张武,唐杰,李栋梁.西北东部气候异常特征及其对冬季高原感热的响应[J].中国沙漠,2006,26(3):415-420. |
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| 作者姓名： | 赵庆云 张武 唐杰 李栋梁 |
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| 作者单位： | 1.兰州中心气象台, 甘肃 兰州 730020; 2.兰州大学大气科学学院 甘肃干旱气候变化与减灾重点实验室，甘肃 兰州 730000; 3.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： | 中国科学院资助项目;甘肃省气象局青年科技创新基金 |
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| 摘 要： | 利用1960—2000年西北东部100个测站，经过面积权重区域平均的降水、气温资料，对该区域气候异常进行分析。结果表明：①对异常旱涝年,亚洲西风带环流及西太平洋副热带高压的位置最为关键。异常涝年,亚洲地区经向环流占优势，东亚大槽偏东，西太平洋副热带高压偏北；异常旱年，亚洲地区纬向环流占优势，东亚大槽偏西，西太平洋副热带高压偏南。②对异常冷暖年，极涡、西风带环流以及西太平洋副热带高压的状况最为关键。气温异常偏高年，北半球极涡强度及亚洲极涡强度均偏弱，欧亚地区盛行纬向环流，西太平洋副热带高压面积偏大，强度明显偏强，西伸脊点明显偏西，位置偏北；气温异常偏低年，北半球极涡强度及亚洲极涡强度均偏强，欧亚地区盛行经向环流，西太平洋副热带高压面积偏小，强度明显偏弱，西伸脊点明显偏东，位置偏南。③冬季高原感热与滞后一个季度的夏季降水、气温的相关较春季的相关更好。
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| 关 键 词： | 西北东部 气候异常 环流特征 青藏高原 感热通量 |
| 文章编号： | 1000-694X（2006）03-0415-06 |
| 收稿时间： | 2005-04-25 |
| 修稿时间： | 2005-08-16 |
Extreme Climate within Eastern Part of Northwest China and Its Response on Sensible Heat over Qinghai-Tibetan Plateau |
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| ZHAO Qing-yun,ZHANG Wu,TANG Jie,LI Dong-liang.Extreme Climate within Eastern Part of Northwest China and Its Response on Sensible Heat over Qinghai-Tibetan Plateau[J].Journal of Desert Research,2006,26(3):415-420. |
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| Authors: | ZHAO Qing-yun ZHANG Wu TANG Jie LI Dong-liang |
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| Institution: | 1.Center of Lanzhou Meteorological Observatory, Lanzhou 730020, China; 2.Key Laboratory of Arid Climatic Changing and Reducing Disaster of Gansu Province, College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000,China; 3.Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China |
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| Abstract: | The extreme climate has been studied by area-weighted and area-averaged precipitation and mean temperature measured at 100 observational stations within the East part of the North-West China(ENWC).The results support that it is the most important for the extreme drought and flood in the ENWC that the pattern of Westerly belt circulation over the Asia region and the position of the West Pacific Subtropical High(WPSH) at 500hPa.During flood years,the meridional circulation predominates over the Asia region,the size of the trough over East Asian is eastward and WPSH is northward.During drought years,zonal circulation predominates over that of the meridian,the size of the trough over East Asian is more westward,WPSH is more southward.The polar vortex and circulation type over the Europe-Asia region are the same important for the cold and warm in the ENWC,as well as the Westerly belt circulation type over the Asia and the West Pacific Subtropical High(WPSH) at 500hPa.During extremely high temperature years,the polar vortex was weaker than normal.Zonal circulation predominates over that of the meridian over the Europe-Asia region.The WPSH is obviously weaker and smaller than the normal;its position is more southward.During extremely low temperature years,the circulation character is opposed to that of the extremely high temperature years.There is a better correlation between the sensible heat flux over Qinghai-Tibetan Plateau in winter and the precipitation and temperature in summer within ENWC than that of in spring. |
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| Keywords: | the East Part of the North-West of China(ENWC) extreme climate circulation feature Qinghai-Tibetan Plateau sensible heat flux |
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