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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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COMPARATIVE ANALYSIS OF VARIOUS DATA OF air-sea temperature difference AND ITS VARIATION ACROSS SOUTH CHINA sea IN THE PAST 35 YEARS

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Journal of Tropical Meteorology 2017年第3期23卷 292-301页

作者： XU Feng XIA Tian-zhu WANG Hui LIU Ke-xiu College of Oceanography and Meteorology Guangdong Ocean UniversityZhanjiang 524088 China Tianjin Binhai New Area Meteorological Bureau Tianjian 300457 China National Marine Data&Information Service Tianjin 300171 China

Using the International Comprehensive Ocean-Atmosphere Data Set(ICOADS) and ERA-Interim data, spatial distributions of air-sea temperature difference(ASTD) in the South China sea(SCS) for the past 35 years are compared,and variations of spatial and temporal distributions of ASTD in this region are addressed using empirical orthogonal function decomposition and wavelet analysis methods. The results indicate that both ICOADS and ERA-Interim data can reflect actual distribution characteristics of ASTD in the SCS, but values of ASTD from the ERA-Interim data are smaller than those of the ICOADS data in the same region. In addition, the ASTD characteristics from the ERA-Interim data are not obvious inshore. A seesaw-type, north-south distribution of ASTD is dominant in the SCS; i.e., a positive peak in the south is associated with a negative peak in the north in November, and a negative peak in the south is accompanied by a positive peak in the north during April and May. Interannual ASTD variations in summer or autumn are decreasing. There is a seesaw-type distribution of ASTD between Beibu Bay and most of the SCS in summer, and the center of large values is in the Nansha Islands area in autumn. The ASTD in the SCS has a strong quasi-3a oscillation period in all seasons, and a quasi-11 a period in winter and spring. The ASTD is positively correlated with the Nio3.4 index in summer and autumn but negatively correlated in spring and winter.

关键词： marine meteorology air-sea temperature difference comparison of data empirical orthogonal function decomposition wavelet analysis ERA-Interim

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