Recent Enhanced Deep Troposphere-to-Stratosphere Air Mass Transport Accompanying the Weakening Asian Monsoon  

作　　者：Bin CHEN Jianzhong MA Wei ZHANG Jianchun BIAN Tianliang ZHAO Xiangde XU 

机构地区：[1]State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences,China Meteorological Administration,Beijing100081,China [2]Department of Plants,Soils and Climate,Utah State University,UT84322,USA [3]Key Laboratory of Middle Atmosphere and Global Environment Observation,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China [4]Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration,Nanjing University of Information Science&Technology,Nanjing 210044,China

出　　处：《Journal of Meteorological Research》2024年第4期708-719,共12页气象学报（英文版）

基　　金：Supported by the National Key Research and Development Program of China (2023YFC3010700);Second Tibetan Plateau Comprehensive Scientific Expedition and Research Program (2019QZKK0105);Science and Technology Development Fund of Chinese Academy of Meteorological Sciences (2023KJ027 and 2024KJ012)。

摘　　要：The Asian monsoon(AM) region is a well-known region with prevailing stratosphere–troposphere exchange(STE).However,how the STE across this region changes with the weakening AM remains unclear.Here,we particularly diagnose the air mass transport between the planetary boundary layer(PBL) and the stratosphere over the AM region during 1992–2017 using the Lagrangian particle dispersion model FLEXPART based on the ERA-Interim reanalysis data.The results show that both the downward and upward deep STEs exhibit a detectable increasing trend,while the latter,namely,the deep troposphere-to-stratosphere transport(DTST),is relatively more significant.Further analysis reveals that the long-term trend of DTST over the AM region could be partly attributed to changes in the Pacific Walker circulation and the air temperature(especially at upper levels).Additionally,it is found that DTST increases markedly over the tropical oceanic regions,while the increasing DTST into the stratosphere can be attributed to the enhanced air masses originated from the PBL over the terrestrial regions,where large amounts of pollutant emissions occur.The results imply that the influence of the DTST on the chemical composition and the climate of the stratosphere over the AM region is expected to become increasingly important,and is thereby of relevance to climate projection in an evolving climate.

关 键 词：stratosphere–troposphere exchange(STE) air mass transport deep troposphere-to-stratosphere transport(DTST) Asian monsoon(AM) POLLUTION 

分 类 号：P425.42[天文地球—大气科学及气象学] X51[环境科学与工程—环境工程]