| 有关南半球大气环流与东亚气候的关系研究的若干新进展 |
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| 引用本文： | 范可,王会军.有关南半球大气环流与东亚气候的关系研究的若干新进展[J].大气科学,2006,30(3):402-412. |
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| 作者姓名： | 范可 王会军 |
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| 作者单位： | 1.云南大学大气科学系,昆明,650091 |
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| 基金项目： | 中国科学院知识创新工程主要方向性项目KZCX3SW221，国家自然科学基金资助项目40125014、40475037 |
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| 摘 要： | 南半球大气环流是全球大气环流的重要组成部分,也是影响气候变化和亚洲季风系统的一个重要因素.中国气象学家很早就注意到南半球大气环流对东亚夏季风降水的影响.近年来,有关南半球气候变率的研究目前正受到世界气象学家越来越多的关注.南半球中高纬大气资料的丰富及南极涛动的确定,使得认识南半球高中纬环流的年际变动规律及其与东亚气候关系成为可能.本文主要介绍近年来有关南极涛动的年际变化与沙尘天气发生频次及东亚冬春季气候的关系,古气候资料揭示的南极涛动与华北降水的关系,以及南半球大气环流与长江中下游夏季降水的关系和南极涛动变率的可预测性等方面的研究进展.并对未来研究方向作了初步的展望.
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| 关 键 词： | 南极涛动 东亚气候 沙尘天气发生频次 可预测性 |
| 文章编号： | 1006-9895（2006）03-0402-11 |
| 收稿时间： | 2005-12-14 |
| 修稿时间： | 2005-12-142006-02-23 |
Studies of the Relationship Between Southern Hemispheric Atmospheric Circulation and Climate over East Asia |
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| FAN Ke and WANG Hui-Jun.Studies of the Relationship Between Southern Hemispheric Atmospheric Circulation and Climate over East Asia[J].Chinese Journal of Atmospheric Sciences,2006,30(3):402-412. |
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| Authors: | FAN Ke and WANG Hui-Jun |
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| Abstract: | The Southern Hemisphere(SH) atmospheric circulation is both an important component of the global general circulation and a key factor influencing the global climate change and Asian monsoon systems.In early times,Chinese meteorologists focused the role of SH in the East Asia summer monsoon and obtain important results.Studies of the SH climate variability are currently paid much attention by meteorologists in the world.In recent years,meteorologists have been doing researches on the SH interannal variability and its association with East Asian Climate,with special focus on the Antarctic Oscillation(AAO) and the subtropical high pressure systems in SH.Besides,studies of the relationship between SH and both East Asian climate and dust during boreal winter and spring have been paid much attention as well.This paper introduces recent studies including the relationship between the interannual variability of AAO and dust weather frequency(DWF) in North China and East Asian climate during boreal winter and spring;central North China precipitation based on the reconstructed data from the Qing Dynasty;the summer rainfall over the Yangtze River valley,as well as the reproducibility of variability of AAO.Potential future research focuses are also discussed in the paper.Recent results show that the interannual variation of AAO plays a significant role in the dust-related atmospheric circulation during boreal spring.AAO and DWF correlate well,with positive AAO tending to decrease DWF in North China.Two possible mechanisms for the AAO-DWF coupling are identified: one is related to a meridional teleconnection pattern;the other is related to a regional circulation pattern over the Pacific Ocean.The positive AAO anomaly decreases the cold activity over East Asia during boreal winter and spring.AAO-related barotropic meridional teleconnection from Antarctic to Arctic is found through analysis of mean meridional circulations.This meridional teleconnection is remarkable over Eurasia area during boreal winter and over the Pacific Ocean during boreal spring.Based on analysis of the long-term central North China precipitation(CNCP) time series reconstructed from the Qing Dynasty official document,it is found that the AAO is negatively correlated with the CNCP during JuneJuly.It follows that AAO-related variability of convergence and convection over the tropical western Pacific can exert impact on the circulation condition and precipitation in north China(actually,the precipitation in the Yangtze River valley as well) through atmospheric teleconnection known as the East Asia-Pacific(or Pacific Japan) teleconnection wave pattern.Researches show that the interannual of Mascarene high(MH) and Australian high(AH) in boreal spring may provide some useful information for the East Asian summer monsoon precipitation.With the intensification of MH during boreal spring through summer,the Meiyu rain tends to increase while the effect of AH on summer rain is confined to southern China.Its physical mechanisms are related to change of convection near the Philippines.The reproducibility of variability of AAO is another focus.Using the NCAR CAM2 model forced with the historical sea surface temperature covering the period of 19502000,there would be some predictability to the AAO.The reproducibility is greater during the austral summer than winter,and the source of much of reproducibility is the tropical Pacific SST.Besides,Sea temperature at high latitudes of SH may force the AAO during boreal spring using IAP9L-AGCM model.However,the issues on the relationships between the Southern Hemisphere circulation and East Asian climate still need be studied further. |
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| Keywords: | Antarctic oscillation East Asian climate dust weather frequency predictability |
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