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| 晚白垩世(80Ma)CO2浓度对东亚气候影响的数值模拟 | |
| 引用本文： | 陈军明,赵平,王成善,黄永建.晚白垩世(80Ma)CO2浓度对东亚气候影响的数值模拟[J].第四纪研究,2009,29(6):1044-1054. |
| 作者姓名： | 陈军明 赵平 王成善 黄永建 |
| 作者单位： | 1. 中国科学院研究生院,北京,100049;中国气象科学研究院,北京,100081 2. 中国气象局国家气象信息中心,北京,100081 3. 中国地质大学(北京)青藏高原地质研究中心,北京,100083 |
| 基金项目： | 国家重点基础研究发展规划项目(973项目) |
| 摘 要： | 利用美国国家大气研究中心(NCAR)的CCSM2.0全球气候系统模式，并结合重建的古地理资料，研究了晚白垩世(80Ma)东亚气候特征以及CO2浓度变化对东亚气候的影响。模拟结果表明： 与现代气候比较，晚白垩纪时期的东亚大陆冬季风和夏季风都偏强，具有同步变化的特点，并且中高纬度年平均地表气温明显增加，而低纬度地区有所下降，年降水变化的区域性特征明显； 就年平均而言，在 30°～40°N 的内陆地区地面净失去水分、变干燥，而在低纬度、大陆东岸以及高纬度地区，地表获得水分、变湿润。晚白垩纪CO2浓度变化对大气辐射和大气热状况的影响是复杂的； 降低CO2浓度可以导致东亚地区气候显著变化，冬季东亚中纬度地区大陆降温比其附近的海洋大，太平洋中高纬度的低压系统加强，因而造成东亚冬季风偏强； 而在夏季，中纬度大陆地区降温幅度大于海洋，西太平洋副热带高压减弱，因而夏季风减弱。对应于较低的CO2浓度，年降水量在东亚及其沿岸的中、低纬度大部分地区显著减少，在东亚高纬度的大陆和海洋上降水的减少幅度不大，而在 30°N 附近亚洲大陆中部和东部的一些地区降水有所增加； 总体上，地表水分收支在东亚大陆的东部都是以负值为主，地面净失去水分、变干燥，其中 30°N 以南的大陆沿岸最显著； 而在东亚大陆的内陆地区，水分收支差异以0～0.5mm/天的正值为主，东亚大陆的东部是以地面净得到水分、变潮湿为主。 |
| 关 键 词： | 白垩纪 温室气候 古气候模拟 CO2浓度 |
MODELING IMPACTS OF ATMOSPHERIC CO2 CONCENTRATION ON EAST ASIAN CLIMATE DURING THE LATE CRETACEOUS(80Ma) |
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| Chen Junming,Zhao Ping,Wang Chengshan,Huang Yongjian.MODELING IMPACTS OF ATMOSPHERIC CO2 CONCENTRATION ON EAST ASIAN CLIMATE DURING THE LATE CRETACEOUS(80Ma)[J].Quaternary Sciences,2009,29(6):1044-1054. | |
| Authors: | Chen Junming Zhao Ping Wang Chengshan Huang Yongjian |
| Institution: | Graduate University of Chinese Academy of Sciences|Beijing 100049|Chinese Academy of Meteorological Sciences|Beijing 100081|National Meteorological Information Centre|China Meteorological Administration|Beijing 100081|Research Center for Tibetan Plateau Geology|China University of Geosciences(Beijing)|Beijing 100083 |
| Abstract: | In this paper,the characteristics of the East Asian climate and the impacts of atmospheric CO_2 concentration variation on the East Asian climate were examined by using the Community Climate System Model version 2 (CCSM 2.0)developed by the National Center for Atmospheric Research (NCAR)as well as the reconstructed paleogeographic data of the Late Cretaceous (80Ma). The simulation results show that the winter and summer monsoons over East Asia were stronger during the Late Cretaceous than at present, exhibiting a synchronously strengthening variation. Annual mean surface air temperature remarkably increased at the mid and high latitudes and decreased slightly in the low latitudes. The variation of annual total precipitation between the Late Cretaceous and the present day showed a pronounced regional feature. As to the annual average,in inspect to the present-day climate,the soil surface lost water in the inland of the East Asia near 30°- 40°N during the Late Cretaceous, becoming dry and obtained water in the low and high latitudes and the eastern coasts of the East Asian land, becoming wet. During the Late Cretaceous,impacts of the CO_2 concentration variation on atmospheric radiation and thermal conditions were complicated. When reducing the CO_2 concentration, the East Asian climate had a significant change. In the winter, the reduction of air temperature in the mid latitudes of the East Asian land was relatively larger than that in the adjacent oceans, with a stronger low-pressure system at the mid and high latitudes of the North Pacific leading to a strengthened winter monsoon over East Asia. In the summer, the decrease of air temperature at the mid latitude of the Asian continent was also greater than that in the oceans, with a weaker subtropical high over the North West Pacific leading to a weaker summer monsoon over East Asia. Moreover, corresponding to a lower CO_2 concentration,the annual total precipitation reduced significantly in most of East Asia and the mid and low latitudes of the East Asian coasts, but varied little in the high latitudes of land and ocean. On the contrary,the precipitation slightly increased in some areas of the central-Eastern Asian continent near 30°N. Generally speaking, the difference of surface water budget was mainly negative in the eastern part of the East Asian land,especially in the coasts of East Asia south of 30°N. This result implies that the soil surface lost water and became dry. In the inland of the East Asian land, the difference of surface water budget was positive, with the value of 0～0.5mm/d,showing that the soil surface obtained water and became wet. |
| Keywords: | Late Cretaceous greenhouse climate paleoclimate modeling CO_2 concentration |
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