A Diagnostic Study of the Influence of Early Spring Soil Moisture in Southeastern China on Interannual Variability of the East Asian Subtropical Summer Monsoon Onset

作     者：Zifan NING Renhe ZHANG Zifan NING;Renhe ZHANG

作者机构：Department of Atmospheric and Oceanic Sciences&Institute of Atmospheric SciencesFudan UniversityShanghai 200438 China Meteorological Administration-Fudan University Joint Laboratory of Marine MeteorologyShanghai 200438 Innovation Center of Ocean and Atmosphere SystemZhuhai-Fudan Innovation Research InstituteZhuhai 519031 Shanghai Scientific Frontier Base for Ocean-Atmosphere Interaction StudiesFudan UniversityShanghai 200438 

出 版 物：《Journal of Meteorological Research》 (气象学报（英文版）)

年 卷 期：2023年第37卷第1期

页      面：45-57页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

基　　金：Supported by the National Natural Science Foundation of China(42288101) Basic Research Fund of Chinese Academy of Meteorological Sciences(2015Z001) 

主　　题：soil moisture(SM) East Asian subtropical summer monsoon(EASSM) sea-land thermal contrast onset 

摘      要：The effect of soil moisture(SM)on the onset of East Asian subtropical summer monsoon(EASSM)is investigated based on multiple sets of reanalysis data in the period of 1981–*** is found that the EASSM is characterized by persistent 2-m s^(−1) southerly winds for about 3 months in spring at 850 hPa over the subtropical region of East *** this feature of the meridional winds,we define the EASSM onset date,and obtain that the climatological onset date is pentad 17.7,around 26 *** the interannual timescale,the onset date of EASSM exhibits statistically significant correlation with the SM in southeastern China in the month preceding the onset,with wetter(drier)conditions being associated with later(earlier)*** physical process by which the preceding SM affects the EASSM onset is further explored by examining the surface energy balance as well as its ***(negative)SM anomalies in southeastern China in the month before onset may induce negative(positive)surface temperature *** decreased(increased)surface temperature in southeastern China before the EASSM onset weakens(strengthens)the zonal sea–land thermal contrast in the surface and low-level atmosphere in the subtropical East *** zonal sea–land thermal contrast in wetter(drier)years induces anomalous northerly(southerly)winds over southeastern China,which tends to delay(advance)the zonal thermal seasonal transition in spring and is conducive to a later(earlier)onset of *** results are helpful for understanding and prediction of the variability of EASSM and the EASSM onset.