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| Recent Progress in the Impact of the Tibetan Plateau on Climate in China | |
| 作者姓名： | 刘屹岷 包庆 段安民 钱正安 吴国雄 |
| 作者单位： | State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG) Institute of Atmospheric Physics，Chinese Academy of Sciences，State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG)，Institute of Atmospheric Physics，Chinese Academy of Sciences，State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG)，Institute of Atmospheric Physics，Chinese Academy of Sciences，Cold and Arid Regions Environmental and Engineering Research Institute，Chinese Academy of Sciences，State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG)，Institute of Atmospheric Physics，Chinese Academy of Sciences，Beijing 100029，Beijing 100029，Beijing 100029，Lanzhou 730000，Beijing 100029 |
| 基金项目： | The authors thank Ms. Yu Jingjing for drawing Fig. 2. This work was jointly supported by the National Key Basic Research and Development Project of China under Grant Nos. 2006CB403607 and 2004CB418302, and by the Natural Science Foundation of China under Grant Nos. 40475027, 40221503, 40575028, and 40523001. |
| 摘 要： | Studies of the impacts of the Tibetan Plateau （TP） on climate in China in the last four years are reviewed. It is reported that temperature and precipitation over the TP have increased during recent decades. From satellite data analysis, it is demonstrated that most of the precipitation over the TP is from deep convection clouds. Moreover, the huge TP mechanical forcing and extraordinary elevated thermal forcing impose remarkable impacts upon local circulation and global climate. In winter and spring, stream flow is deflected by a large obstacle and appears as an asymmetric dipole, making East Asia much colder than mid Asia in winter and forming persistent rainfall in late winter and early spring over South China. In late spring, TP heating contributes to the establishment and intensification of the South Asian high and the abrupt seasonal transition of the surrounding circulations. In summer, TP heating in conjunction with the TP air pump cause the deviating stream field to resemble a cyclonic spiral, converging towards and rising over the TP. Therefore, the prominent Asian monsoon climate over East Asia and the dry climate over mid Asia in summer are forced by both TP local forcing and Eurasian continental forcing. Due to the longer memory of snow and soil moisture, the TP thermal status both in summer and in late winter and spring can influence the variation of Eastern Asian summer rainfall. A combined index using both snow cover over the TP and the ENSO index in winter shows a better seasonal forecast. On the other hand, strong sensible heating over the Tibetan Plateau in spring contributes significantly to anchor the earliest Asian monsoon being over the eastern Bay of Bengal （BOB） and the western Indochina peninsula. Qualitative prediction of the BOB monsoon onset was attempted by using the sign of meridional temperature gradient in March in the upper troposphere, or at 400 hPa over the TP. It is also demonstrated by a numerical experiment and theoretical study that the heating over the TP lea |
| 关 键 词： | 中国 青藏高原 气候 飓风 半月变化 |
| 收稿时间： | 13 February 2007 |
| 修稿时间： | 2007-02-13 |
Recent progress in the impact of the Tibetan Plateau on climate in China |
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| Liu?Yimin,Bao?Qing,Duan?Anmin,Qian?Zheng’an,Wu?Guoxiong.Recent Progress in the Impact of the Tibetan Plateau on Climate in China[J].Advances in Atmospheric Sciences,2007,24(6):1060-1076. | |
| Authors: | Liu Yimin Bao Qing Duan Anmin Qian Zheng’an Wu Guoxiong |
| Institution: | State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics ( LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics ( LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics ( LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000,State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics ( LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
| Abstract: | Studies of the impacts of the Tibetan Plateau (TP) on climate in China in the last four years are reviewed.It is reported that temperature and precipitation over the TP have increased during recent decades.From satellite data analysis,it is demonstrated that most of the precipitation over the TP is from deep convection clouds.Moreover,the huge TP mechanical forcing and extraordinary elevated thermal forcing impose remarkable impacts upon local circulation and global climate.In winter and spring,stream flow is deflected by a large obstacle and appears as an asymmetric dipole,making East Asia much colder than mid Asia in winter and forming persistent rainfall in late winter and early spring over South China.In late spring,TP heating contributes to the establishment and intensification of the South Asian high and the abrupt seasonal transition of the surrounding circularions.In summer,TP heating in conjunction with the TP air pump cause the deviating stream field to resemble a cyclonic spiral,converging towards and rising over the TP.Therefore,the prominent Asian monsoon climate over East Asia and the dry climate over mid Asia in summer are forced by both TP local forcing and Eurasian continental forcing.Due to the longer memory of snow and soil moisture,the TP thermal status both in summer and in late winter and spring can infuence the variation of Eastern Asian summer rainfall.A combined index using both snow cover over the TP and the ENSO index in winter shows a better seasonal forecast.On the other hand,strong sensible heating over the Tibetan Platean in spring contributes significantly to anchor the earliest Asian monsoon being over the eastern Bay of Bengal (BOB) and the western Indochina peninsula.Qualitative prediction of the BOB monsoon onset was attempted by using the sign of meridional temperature gradient in March in the upper troposphere,or at 400 hPa over the TP.It is also demonstrated by a numerical experiment and theoretical study that the heating over the TP leads to a significant variability in the atmospheric circulation on a quasi-biweekly timescale,bearing much similarity to that found from observational studies.Finally,some important issues for further work in understanding the impacts of the TP are raised. |
| Keywords: | Tibetan Plateau TP-dipole cyclonic spiral quasi-biweekly oscillation |
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