Shift of the principal mode of Pan-Asian monsoon summer precipitation in terms of spatial pattern  

作　　者：GAO Ya 

机构地区：[1]Nansen-Zhu International Research Centre, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China [2]Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing, China

出　　处：《Atmospheric and Oceanic Science Letters》2017年第3期221-227,共7页大气和海洋科学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China[grant number 41505070];the Development Program of China[grant number 2016YFA0600703];the Chinese Academy of Sciences-Peking University Joint Research Program

摘　　要：This paper documents that the principal mode of Pan-Asian monsoon summer precipitation experienced a prominent interdecadal shift around 1992/1993 in terms of spatial pattern and major driving factors. During 1979-1992 （Period 1, P1）, Pan-Asian monsoon summer precipitation anomalies mainly display a meridional dipole pattern from north to south, whereas in the period 1993-2016 （Period 2, P2）, it shows a meridional tripole pattern instead. The summer precipitation in P1 is primarily associated with a combination of the developing phase （central-eastern Pacific type） and decaying phase （eastern Pacific type） of El Nino-Southem Oscillation （ENSO）; while in P2, it is mainly associated with the decaying phase of central-eastern-Pacific-type ENSO.本文揭示了泛亚洲季风区夏季降水主模态在90年代初发生了明显的年代际变化,主要体现在空间型和主要驱动因子的差异上。前期夏季降水主要呈现两极型变化,后期为显著的三极型分布。1979.1992年,泛亚洲季风区主要受到中东太平洋型ENSO的发展位相和东太平洋型ENSO衰退位相两者的共同影响;1992.2016年,夏季降水则对应中东型ENSO的衰退位相。

关 键 词：Pan-Asian monsoon summer precipitation interdecadal shift ENSO phase Maritime Continent SST 

分 类 号：P426.6[天文地球—大气科学及气象学]