| 6kaB.P.东亚区域气候模拟及其变化机制探讨 |
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| 引用本文： | 郑益群,于革,薛滨,王苏民.6kaB.P.东亚区域气候模拟及其变化机制探讨[J].第四纪研究,2004,24(1):28-38. |
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| 作者姓名： | 郑益群 于革 薛滨 王苏民 |
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| 作者单位： | 中国科学院南京地理与湖泊研究所,南京,210008;中国人民解放军理工大学气象学院,南京,211101;中国科学院南京地理与湖泊研究所,南京,210008 |
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| 基金项目： | 国家自然科学基金项目 (批准号 :40 2 0 10 48和 40 2 3 10 11)，国家重点基础研究发展规划项目 (批准号 :2 0 0 2CB412 3 0 0 )，中国科学院知识创新工程重大项目 (批准号 :KZCX1-SW -12和KZCX3 -SW -3 2 1)共同资助 |
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| 摘 要： | 中全新世是地质历史上最近的温暖时期。文章利用包含较详细陆面过程的区域气候模式,通过分别加入现代植被和根据花粉化石资料转化的东亚地区古植被,模拟了6kaB.P.东亚季风气候,并研究了植被变化对东亚气候的影响。由区域气候模拟得到的较高分辨率的气候演变图像表明6kaB.P.太阳辐射季节循环增大,高纬度地区积雪、海冰减少,极地海洋升温,导致冬季大陆冷高压减弱,使中国冬季温度降低幅度大大减小。模拟中加入恢复的古植被造成地表反照率减小,使得冬季进一步升温,这不但突破了PMIP众多模拟的东亚6kaB.P.冬季降温的局限,而且使模拟温度变化的季节特征与古地质资料更为吻合。中全新世东亚大陆全年升温导致东亚夏季风强盛、冬季风减弱;降水及有效降水增加,降水带向西、向北扩张。与PMIP模拟相比,由于模式分辨率的提高,该工作模拟出了中国东部区域性降水增加的特征并得到了较为精细的气候变化空间分布。
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| 关 键 词： | 中全新世 区域气候模拟 植被变化 东亚季风 |
| 文章编号： | 1001-7410(2004)01-28-11 |
| 收稿时间： | 2003-05-25 |
| 修稿时间： | 2003年5月25日 |
SIMULATIONS OF EAST ASIAN CLIMATE AT 6kaB.P. |
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| Institution: | 1. Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008;
2. Institute of Meteorology, PLA University of Sciences and Technology, Nanjing 211101 |
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| Abstract: | Using a regional climate model with detailed land surface processes, East Asian monsoon climate at 6kaB.P. is simulated by employing the present day vegetation and the paleovegetation converted from the pollen records in the East Asia region, and the impact of the changes in vegetation on East Asian climate is investigated as well. The climatic evolution figures with a higher resolution obtained from the regional climate simulations show that the enlargement of the seasonal cycle of insolation, the reducing of perpetual snow and sea ice in high latitudes, and the increasing of polar sea temperature at 6kaB.P. led to the weakening of winter continental anticyclones and hence the diminishing of the amplitude of winter temperature decline in China; by the inclusion of paleovegetation in simulation, the surface albedo was reduced, thus further increasing in the winter temperature. This result not only made a break through the limitation of the winter temperature decline (compared with the present) obtained from many simulations of Paleoclimate Modeling Intercomparison Project (PMIP), but also renders the seasonal characters of simulated temperature changes in a better agreement with the geological records. The temperature rise in whole year during the 6kaB.P. over the East Asian continent resulted in the strengthening of the East Asian summer monsoon and the weakening of the winter monsoon; the precipitation and effective precipitation increased, and the monsoon rain belt spread westwards and northwards.$$ |
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| Keywords: | Middle Holocene regional climate simulation vegetation changes East Asian monsoon |
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