| 2.6 Ma BP 前后亚洲季风系统的重组 |
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| 引用本文： | 王建,刘泽纯,陈晔,黄巧华,陈霞.2.6 Ma BP 前后亚洲季风系统的重组[J].古地理学报,2000,2(2):73-83. |
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| 作者姓名： | 王建 刘泽纯 陈晔 黄巧华 陈霞 |
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| 作者单位： | 南京师范大学地理科学学院 南京 210097 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，KZ-951-A1-204， |
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| 摘 要： | 根据数值模拟的结果和中国区域环境分异与演化的地质记录，对2.6 Ma BP前后季风系统的调整进行了分析。结果发现，在2.6 Ma BP前后，亚洲季风明显增强，不仅冬季风明显增强，而且夏季风也明显增强；冬季风（东亚冬季风）在中国北方的盛行风向由偏西风转变为偏北风；冬季风（东亚冬季风）的影响范围明显扩大，由中国的西北、华北、东北地区逐步扩大到华中、华东与华南地区；由于受青藏高原的阻挡，热带西南季风对青藏高原北部及西北地区的直接影响大大减弱。这是青藏高原达到了一个重要的临界高度（可能是2000 m）所导致的亚洲季风系统调整的结果。
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| 关 键 词： | 亚洲 季风 青藏高原 环境变迁 气候变化 古地理 古气侯 |
| 修稿时间： | 1999年12月28 |
REORGANIZATION OF THE ASIAN MONSOON SYSTEM AT ABOUT 2.6 Ma AGO |
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| Wang jian,Liu Zechun,Chen Ye,Huang Qiaohua,Chen Xia.REORGANIZATION OF THE ASIAN MONSOON SYSTEM AT ABOUT 2.6 Ma AGO[J].Journal of Palaeogeography,2000,2(2):73-83. |
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| Authors: | Wang jian Liu Zechun Chen Ye Huang Qiaohua Chen Xia |
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| Institution: | Nanjing Normal University Nanjing 210097 |
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| Abstract: | In this paper, the changes of the Asian monsoon system at about 2.6 Ma ago are discussed based on atmospheric simulations and analysis of the geological records. The results show that the Asian monsoon system reorganized at about 2.6 Ma ago. At that time, both winter and summer monsoons being strengthened obviously and the direction of the winter monsoon in North China changed from North West West to North West North. In China, the area influenced by the East Asian monsoon increased, but the area influenced by Indian monsoon decreased. This is attributed to the uplifting of the Qinghai—Xizang Plateau and the southwestward migration of the center of the Asian Low. At some time of the Pliocene, the Tropical Southwest Monsoon had spreaded onto the Qinghai—Xizang region and has influenced areas over the North China and Northwest China. However, after 2.6 Ma BP, the effects of the Tropical Southwest Monsoon on Northwest China and the Northern part of the Qinghai—Xizang Plateau has decreased again. All these suggest that the Qinghai—Xizang Plateau perhaps reached about 2000 meter elevation above sea level at about 2.6 Ma BP. |
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