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On the relationship between convection intensity of South China Sea summer monsoon and air-sea temperature difference in the tropical oceans

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Acta Oceanologica Sinica 2004年第2期23卷 267-278页

作者： linailan LIANGJianyin GUDejun WANGDongxiao GuangzhouInstituteofTropicalandMarineMeteorologyofChinaMeterologicalAdministration Guangzhou510080China KeyLaboratoryofTropicalMarineEnviromentaldynamics SouthChinaSeaInstituteofOceanologyChineseAcademyofSciencesGuangzhou510301China

The annual, interannual and inter-decadal variability of convection intensity of South China Sea (SCS) summer monsoon and air-sea temperature difference in the tropical ocean is analyzed, and their relationship is discussed using two data sets of 48-a SODA (simple ocean data assimilation) and NCEP/NCAR. Analyses show that in wintertime Indian Ocean (WIO), springtime central tropical Pacific (SCTP) and summertime South China Sea-West Pacific (SSCSWP), air-sea temperature difference is significantly associated with the convection intensity of South China Sea summer monsoon. Correlation of the inter-decadal time scale (above 10 a) is higher and more stable. There is inter-decadal variability of correlation in scales less than 10 a and it is related with the air-sea temperature difference itself for corresponding waters. The inter-decadal variability of the convection intensity during the South China Sea summer monsoon is closely related to the inter-decadal variability of the general circulation of the atmosphere. Since the late period of the 1970s, in the lower troposphere, the cross-equatorial flow from the Southern Hemisphere has intensified. At the upper troposphere layer, the South Asian high and cross-equatorial flow from the Northern Hemisphere has intensified at the same time. Then the monsoon cell has also strengthened and resulted in the reinforcing of the convection of South China Sea summer monsoon.

关键词： tropical oceans air-sea temperature difference South China Sea summer monsoon convection, Convec-tion intensity

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