| 中国西北夏季气温变化及其对青藏高原地面感热异常响应的诊断与数值试验 |
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| 引用本文： | 李栋梁,谢金南,赵仲莲,费晓玲,李耀辉.中国西北夏季气温变化及其对青藏高原地面感热异常响应的诊断与数值试验[J].气候与环境研究,1997,2(4):377-386. |
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| 作者姓名： | 李栋梁 谢金南 赵仲莲 费晓玲 李耀辉 |
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| 作者单位： | 甘肃省气象资料中心，甘肃省气象局，兰州气象学校，兰州干旱气象研究所 |
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| 基金项目： | 国家“九五”重中之重科技项目,甘肃省气象局95－1课题 |
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| 摘 要： | 利用陕、甘、宁、青、新五省（区）９０个测站，１９６０～１９９０年历年夏季月平均气温，采用主成分分析、旋转主成分分析和全球大气环流模式，对中国西北夏季气温变化的时空异常特征及其对青藏高原地面感热通量强弱变化的响应进行了诊断分析和数值试验。结果表明：中国西北地区气温变化在空间上具有较好的一致性，但由于地形和下垫面的影响，夏季气温异常主要表现为６种气候类型（区），即青海高原区、河套区、北疆区、渭水流域区、南疆西部区、东疆－河西走廊区。５０年代以来气温演变的主要特点是除青海高原和北疆外的西北大部分地方夏季由暖变冷。当北半球５００ｈＰａ高度距平场呈欧亚型振荡，则有利于中国西北大范围气温偏高（低）。青藏高原地面感热通量的异常增强，可引起西北夏季西部偏暖，东部偏冷。
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| 关 键 词： | 中国西北 气温异常 青藏高原 地面感热通量 数值试验 |
A Diagnosis and Numerical Experiment of Responses about Summer Temperature Change in Northwest China on Surface Sensible Heat Anomaly in the Qinghai-Xizang Plateau |
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| Li Dongliang,Xie Jinnan,Zhao Zhonglian,Fei Xiaoling and Li Yaohui.A Diagnosis and Numerical Experiment of Responses about Summer Temperature Change in Northwest China on Surface Sensible Heat Anomaly in the Qinghai-Xizang Plateau[J].Climatic and Environmental Research,1997,2(4):377-386. |
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| Authors: | Li Dongliang Xie Jinnan Zhao Zhonglian Fei Xiaoling and Li Yaohui |
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| Abstract: | With principal component analysis, rotated principal component analysis and atmospheric circulation model, the space-time anomaly feature of summer temperature anomaly in Northwest China and the response on surface sensible heat anomaly in the Qinghai-Xizang Plateau are studied by using the temperature data in June, July and August for the period 1960 to 1990 from 90 observational stations. Results show that the summer temperature variations are spatially well consistent, however, impact in topographic and underlying surface, the summer temperature anomaly have six principal climate type areas: the Qinghai Plateau, Hetao, the Northern Xinjiang, the Weishui River basin, west of the Southern Xinjiang, the Eastern Xinjiang-Hexi Corridor. The summer temperature has been becoming colder in greater part of Northwest China except the Qinghai Plateau and the Northern Xinjiang. When 500 hPa height departure in the North Hemisphere appear Eurasian Pattern oscillation, temperature in the greater part of Northwest China is higher (or lower) in summer. When the sensible heat flux anomaly in the underlying surface is stronger (or weaker) in the Qinghai-Xizang Plateau in summer, the western Northwest China is warmer (or colder), and eastern is colder (or warmer) in the same time. |
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| Keywords: | Northwest China temperature anomaly Qinghai-Xizang Plateau surface sensible flux numerical experiment |
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