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《Chinese Journal of Geophysics》 2016-01
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Impact of equatorial MJO activity on summer monsoon onset in the South China Sea

LIN Ai-Lan;GU De-Jun;LI Chun-Hui;ZHENG Bin;Institute of Tropical and Marine Meteorology,Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction,China Meteorological Administration;  
Previous studies show that the interannual and interdecadal variability of sea surface temperature(SST)and the variation of the atmospheric intraseasonal variations are the factors that affect summer monsoon onset in the South China Sea(SCS).However there is little analysis about physical relationship between the equatorial Madden-Julian Oscillation(MJO)activity and the SCS summer monsoon onset.This paper attempts to study the impact of MJO activity on SCS summer monsoon onset and its synergy with tropical SST signal.The 35a(1979—2013)daily mean NCEP-DOE Reanalysis data,daily outgoing longwave radiation(OLR)and monthly extended reconstructed SST(ERSST.v2)from NOAA are used to analyze the impact of MJO activity on SCS summer monsoon onset and its synergy with tropical SST signal.Results show that MJO in the West Pacific phase is favorable to the onset of SCS summer monsoon,and MJO in Indian Ocean phase is unfavorable to SCS summer monsoon onset.WhenMJO is in western Pacific phase,more latent heat releases from enhancing convection,resulting in an anomalous cyclonic circulation at tropospheric low level in SCS to Northwest Pacific as Rossby wave respond.The anomalous cyclonic circulation is favorable to the retreating eastward of subtropical high.On the other hand,the heat source over Philippines vicinity promotes the establishment of South Asia high over Indochina Peninsula and the northern SCS,and wind changes to easterly over SCS at tropospheric high level.Therefore the SCS summer monsoon begins.When MJO is in Indian Ocean phase,tropical western Pacific changes to cold source because of the weakening of convection,the situation opposite with above appears,which is not conducive to the SCS summer monsoon onset.The years which are inconsistent between SCS summer monsoon onset dates and SST signal are basically due to the characteristics of MJO and the cyclone circulation over Bay of Bengal during the seasonal transition period.The equatorial MJO activity is related closely with SCS summer monsoon onset.The physical process in which MJO activity poses impact on SCS summer monsoon onset is primarily the response of atmosphere to the heat source.MJO activity and cyclonic circulation over Bay of Bengal cooperated with interannual SST signal influence the SCS summer monsoon onset.Comprehensive consideration of three factors,which are MJO,SST signal and circulation over Bay of Bengal,has great significance for improving monsoon onset prediction.
【Fund】: 国家重大科学研究计划项目(2014CB953901);; 国家自然科学基金项目(41575043);; 广东省科技计划重点项目(2012A030200006)资助
【CateGory Index】: P461;P425.42
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