| 上新世中期中国气候的数值模拟分析 |
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| 引用本文： | 姜大膀.上新世中期中国气候的数值模拟分析[J].第四纪研究,2009,29(6):1033-1043. |
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| 作者姓名： | 姜大膀 |
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| 作者单位： | 中国科学院大气物理研究所竺可桢-南森国际研究中心;中国科学院气候变化研究中心,北京,100029 |
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| 基金项目： | 国家重点基础研究发展规划项目(973项目)，国家科技支撑计划项目，国家自然科学基金项目 |
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| 摘 要： | 使用中国科学院大气物理研究所的全球大气环流模式，曾就上新世中期(距今约3百万年前)气候进行过数值模拟试验，在已有针对全球气候进行分析的工作基础上，集中研究了该地质时期我国气候的变化特征。数值试验结果表明，除了青藏高原地区由于地形海拔高度变化而引起的局地冷却现象以外，上新世中期我国约100°E以东地区地表气温上升4～8℃，升温中心位于江淮流域下游地区； 该经度线以西地区地表气温升幅相对要弱一些，在1～4℃之间。上新世中期年均降水在我国东部地区显著减少，平均减幅在0.5mm/天以上，特别是在长江中游地区； 新疆北部、青海和西藏大部年均降水略有增加，而新疆中部和南部年均降水略有减少。在对流层低层，上新世中期东亚冬季风系统减弱，夏季风系统总体上略有减弱； 在对流层中层，冬季东亚大槽显著减弱，夏季中高纬度地区500hPa位势高度升高。在以上结果中，上新世中期我国气候相对于现在偏暖、东亚冬季风强度减弱得到了代用资料的支持。
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| 关 键 词： | 上新世中期 中国气候 数值模拟 |
NUMERICAL SIMULATION OF THE MIDDLE PLIOCENE CLIMATE IN CHINA |
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| Jiang Dabang.NUMERICAL SIMULATION OF THE MIDDLE PLIOCENE CLIMATE IN CHINA[J].Quaternary Sciences,2009,29(6):1033-1043. |
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| Authors: | Jiang Dabang |
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| Institution: | NansenZhu International Research Centre|Institute of Atmospheric Physics|Chinese Academy of Sciences|Climate Change Research Center|Chinese Academy of Sciences|Beijing 100029 |
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| Abstract: | Numerical experiments of the Middle Pliocene (ca. 3MaB. P.) climate were previously performed by an atmospheric general circulation model developed in Institute of Atmospheric Physics, Chinese Academy of Sciences (hereinafter referred to as IAP-AGCM) ,whose boundary conditions were provided by the U. S. Geological Survey's Pliocene Research, Interpretations, and Synoptic Mapping (PRISM) group. In this paper, such experiments were used to analyze the Middle Pliocene climate in China. The experiment results indicate that except that the annual surface temperature in the Qinghai-Tibetan Plateau has a local decrease due to the change of topographical height, the annual surface temperature of the Middle Pliocene in the region east of about 100～E of the mainland of China would have a rise of 4 ～ 8℃ with respect to the present,with the maximum in the lower reaches of the Yangtze and Huai Rivers and a rise of 1 ～ 4℃ in the region west of about 100° E. The annual precipitation of the Middle Pliocene would have a significant decrease in East China, with an average of above 0.5mm/day, particularly in the middle reach of the Yangtze River, but a slight increase in Northern Xinjiang, Qinghai, and most Tibet except for a little decrease in central and Southern Xinjiang. In the lower troposphere,the East Asian monsoon system of the Middle Pliocene would have a weakening in winter and a slight weakening in summer. In the middle troposphere, the East Asian trough would have a significant weakening in winter, but a rise of geopotential height at 500hPa in summer. The surface warming and the winter weakening of the East Asian monsoon mentioned above are supported by the proxy data. |
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| Keywords: | Middle Pliocene China climate numerical modeling |
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