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Influence of atmospheric {1.at sources over t{1. Tibetan Plateau and t{1. tropical western North Pacific on t{1. inter-decadal variations of t{1. stratosp{1.re-troposp{1.re exchange of water vapor

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science {1. Earth {2. 2008年第8期51卷 1179-1193页

作者： zhan ruifen1,2&li jianping2 1Shanghai Typhoon institute of china Meteorological Administration,Shanghai 200030,china 2state key Laboratory of numerical modeling for atmospheric sciences and geophysical fluid dynamics(LASG),institute of atmospheric physics,chinese academy of sciences,beijing 100029,china 1. Shanghai Typhoon institute of {1. Meteorological Administration Shanghai 200030 China 2. state {1. Laboratory of {2. modeling for atmospheric sciences and geophysical fluid dynamics (LASG) Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

This study investigates the Stratosphere-Troposphere Exchange(STE) of water vapor,emphasizes its interdecadal variations over Asia in boreal summer,and discusses the influences of atmospheric heat sources over the Tibetan Plateau and the tropical western North Pacific(WNP) on them by using the Wei method with reanalysis data from the European Centre for Medium-Range Weather Forecasts(ECMWF) for the years of *** climatology shows that the upward transport of water vapor across the tropopause in boreal summer is the most robust over the joining area of the South Asian Peninsula and Indian-Pacific Oceans(defined as AIPO).The upward transport over there can persistently convey the abundant water vapor into the stratosphere and then influence the distribution and variation of the stratospheric water *** analysis shows that interdecadal variations of the water vapor exchange over the AIPO are significant,and its abrupt change occurred in the mid-1970s and the early *** these three periods,as important channels of the water vapor exchange,the effect of Bay of Bengal-East Asia as well as South china Sea was gradually weakening,while the role of the WNP becomes more and more *** studies show that atmospheric heat sources over the Tibetan Plateau and the WNP are two main factors in determining the interdecadal variations of water vapor *** thermal influences over the Tibetan Plateau and the WNP have been greatly adjusted over the pass 44 *** synthesis influences the interdecadal variations of the water vapor exchange by changing the Asian summer monsoon,but their roles vary with time and *** after 1992,the influence of heat source over the Tibetan Plateau remarkably weakens,while the heat source over the WNP dominates the across-tropopause water vapor *** have important implications for understanding the transport of other components in the atmosphere and estimating the impact of human activities(

关键词： Tibetan Plateau tropical western North Pacific atmospheric heat source STE inter-decadal variations

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Statistical characteristics of the double ridges of subtropical high in the Northern hemisphere

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science Bulletin 2005年第20期 82-87页

作者： zhan ruifen1,2.3, li jianping1 & he jinhai2. 1. state key Laboratory of numerical modeling for atmospheric sci- ences and geophysical fluid dynamics (LASG), institute of atmos- pheric physics, chinese academy of sciences, beijing 100029, china 2. Department of atmospheric sciences, institute of Meteorology, Nan- jing University of Information science and Technology, Nanjing 210044, china 3. Graduate School of the chinese academy of sciences, beijing 100039, china

The genera{1.ty and some c{1.matological charac- teristics of the double ridge systems of subtropical high (SH) are investigated statistically by using the daily NCEP/NCAR reanalysis data from 1.58 to 1.98. The results show that the SH double-ridge event is a common phenomenon in the Northern hemisphere, with the distinct seasonal and re- gional features, that is, the majority of SH double-ridge geneses concentrate over the eastern North India Ocean- western North Pacific as well as the central North Pacific in the period from mid-July to mid-September. Especially over the western North Pacific subtropics, the SH double-ridge events are extremely active. It is found that the {1.fe cycle of most double-ridge events of western Pacific subtropical high (WPSH) is shorter but some still last longer. The WPSH dou- ble-ridge events occur most frequently from July to Septem- ber, while there is a paucity of occurrences during Novem- ber-March. Also, it is shown that the WPSH double-ridge events have a strong interannual variation with a certain periodicity which possesses a remarkably abrupt change in the mid-1.70s. Additionally, the relationship between the WPSH double ridges and the meridional movement of WPSH is discussed.

关键词： subtropical high double ridges statistical characteristics meridional movement.

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Statistical characteristics of the double ridges of subtropical high in the Northern hemisphere

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chinese {1.ence Bulletin 2005年第20期50卷 2336-2341页

作者： zhan {1. {2. jianping he jinhai state {1. Laboratory of {2. modeling for atmospheric sciences and geophysical fluid dynamics (LASG) Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Department of atmospheric {1. Institute of Meteorology Nanjing University of Information Science and Technology Nanjing 210044 China Graduate School of the{1. Beijing100039 China

关键词：亚热带高度双脊系统回归线北半球气候学

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