Tanzanian rainfall responses to El Nino and positive Indian Ocean Dipole events during 1951-2015

作     者：Dickson Mbigi Ziniu Xiao Dickson Mbigi;Ziniu Xiao

作者机构：State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid DynamicsInstitute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina University of Chinese Academy of SciencesBeijingChina Department of PhysicsUniversity of Dar es SalaamDar es SalaamTanzania 

出 版 物：《Atmospheric and Oceanic Science Letters》 (大气和海洋科学快报（英文版）)

年 卷 期：2021年第14卷第6期

页      面：41-47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：the financial support from the Chinese Academy of Sciences"Belt and Road"Masters Fellowship Programme 

主　　题：Rainfall Indian Ocean Dipole El Nino Tanzania 

摘      要：The relative impacts of Indian and Pacific Ocean processes on Tanzanian rainfall was evaluated using composite and correlation *** was found that the seasonal responses of rainfall to positive Indian Ocean Dipole(pIOD)and El Nino events are substantial from September-October-November(SON)to December-January-February(DJF),whereas the Indian Ocean Dipole(IOD)exerts more control than El Nino-Southern Oscillation(ENSO)in both *** associated relationship with the sea surface temperature(SST)and large-scale atmo-spheric circulations revealed distinct *** the pure pIOD years,there is above-normal rainfall over the entire country.A strong rainfall condition is evident over the Lake Victoria basin and coastal and northeastern highland parts of the country during SON,while areas of the central and southern highlands exhibit substantial rains during *** the pure El-Nino events,Tanzania has suffered from insignificant,weak,and non-coherent rainfall conditions during ***,a contrasting insignificant rainfall signature is found between the north-ern and southern parts of the country during the subsequent DJF *** the co-occurrence of pIOD and El Nino,significant,excessive rainfall conditions are restricted to over the northern coast and northeastern areas of the country during SON,consistent with the rainfall pattern for pIOD.A weak,positive rainfall condition is observed over the entire country in the following season of ***,in terms of Tanzanian rainfall,the IOD/ENSO variability and the associated impacts can be explained by the anomalous SST and circulation anomalies.