Uncertainties of ENSO-related Regional Hadley Circulation Anomalies within Eight Reanalysis Datasets  

作　　者：Yadi LI Xichen LI Juan FENG Yi ZHOU Wenzhu WANG Yurong HOU 

机构地区：[1]International Center for Climate and Environment Sciences(ICCES),Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China [2]University of Chinese Academy of Sciences,Beijing 101408,China [3]College of Global Change and Earth System Science(GCESS),Beijing Normal University,Beijing 100875,China

出　　处：《Advances in Atmospheric Sciences》2024年第1期115-140,共26页大气科学进展（英文版）

基　　金：supported by the National Key Research and Development Program of China(Grant No.2018YFA0605703);the National Natural Science Foundation of China(Grant Nos.42176243,41976193 and 41676190);supported by National Natural Science Foundation of China(Grant No.41975079)。

摘　　要：El Nino-Southern Oscillation(ENSO),the leading mode of global interannual variability,usually intensifies the Hadley Circulation(HC),and meanwhile constrains its meridional extension,leading to an equatorward movement of the jet system.Previous studies have investigated the response of HC to ENSO events using different reanalysis datasets and evaluated their capability in capturing the main features of ENSO-associated HC anomalies.However,these studies mainly focused on the global HC,represented by a zonal-mean mass stream function(MSF).Comparatively fewer studies have evaluated HC responses from a regional perspective,partly due to the prerequisite of the Stokes MSF,which prevents us from integrating a regional HC.In this study,we adopt a recently developed technique to construct the three-dimensional structure of HC and evaluate the capability of eight state-of-the-art reanalyses in reproducing the regional HC response to ENSO events.Results show that all eight reanalyses reproduce the spatial structure of HC responses well,with an intensified HC around the central-eastern Pacific but weakened circulations around the Indo-Pacific warm pool and tropical Atlantic.The spatial correlation coefficient of the three-dimensional HC anomalies among the different datasets is always larger than 0.93.However,these datasets may not capture the amplitudes of the HC responses well.This uncertainty is especially large for ENSO-associated equatorially asymmetric HC anomalies,with the maximum amplitude in Climate Forecast System Reanalysis(CFSR)being about 2.7 times the minimum value in the Twentieth Century Reanalysis(20CR).One should be careful when using reanalysis data to evaluate the intensity of ENSO-associated HC anomalies.

关 键 词：regional Hadley circulation ENSO atmosphere-ocean interaction reanalysis data 

分 类 号：P73[天文地球—海洋科学]