Multi-decadal Changes of the Impact of El Niño Events on Tibetan Plateau Summer Precipitation  

作　　者：Weinan Jiang Ning Cao Riga Aze Jianjun Xu 

机构地区：[1]College of Ocean and Meteorology,Guangdong Ocean University,Zhanjiang,Guangdong,524088,China [2]CMA-GDOU Joint Laboratory for Marine Meteorology,Guangdong Ocean University,Zhanjiang,Guangdong,524088,China [3]South China Institute of Marine Meteorology(SIMM),Guangdong Ocean University,Zhanjiang,Guangdong,524088,China [4]Shenzhen Institute of Guangdong Ocean University,Shenzhen,Guangdong,518108,China

出　　处：《Journal of Atmospheric Science Research》2024年第1期90-105,共16页大气科学研究（英文）

基　　金：This research was funded by the Second Tibetan Plateau Scientific Expedition and Research(STEP)program(2019QZKK0105);the Shenzhen Science and Technology Program(JCYJ20210324131810029);the National Natural Science Foundation of China(72293604,42275017);the Guangdong Provincial College Innovation Team Project(060313452101);the Program for scientific research start-up funds of Guangdong Ocean University(R17056).

摘　　要：Precipitation on the Tibetan Plateau(TP)has an important effect on the water supply and demand of the downstream population.Involving recent climate change,the multi-decadal variations of the impact of El Niño-Southern Oscillation(ENSO)events on regional climate were observed.In this work,the authors investigated the changes in summer precipitation over TP during 1950-2019.At the multi-decadal scale,the authors found that the inhabiting impact of El Niño events on the TP summer precipitation has strengthened since the late 1970s.The main factor contributing to this phenomenon is the significant amplification in the decadal amplitude of El Niño during 1978-2019 accompanied by a discernible escalation in the frequency of El Niño events.This phenomenon induces anomalous perturbations in sea surface temperatures(SST)within the tropical Indo-Pacific region,consequently weakening the atmospheric vapor transport from the western Pacific to the TP.Additionally,conspicuous anomalies in subsidence motion are observed longitudinally and latitudinally across the TP which significantly contributes to a curtailed supply of atmospheric moisture.These results bear profound implications for the multi-decadal prediction of the TP climate.

关 键 词：Tibetan plateau Summer precipitation ENSO Multi-decadal changes Climate variability 

分 类 号：P73[天文地球—海洋科学]