CHARACTERISTICS OF THE NORTHERN HEMISPHERE SUB-TROPICAL HIGH SEASONAL SPLITTING OVER THE ASIAN MONSOON SECTORS AND ITS POSSIBLE MECHANISM  

作　　者：祝从文 何金海 谭言科 

机构地区：[1]Chinese Academy of Meteorological Sciences, Beijing 100081 China LASG, IAP, Chinese Academy of Sciences, Beijing 100029 China [2]Nanjing University of Information Engineering, Nanjing 210044 China [3]Meteorological

出　　处：《Journal of Tropical Meteorology》2004年第2期160-170,共11页热带气象学报（英文版）

基　　金：Project "863" (2002AA135360); Key Project from the National Natural Science Foundation ofChina (40135020); National Natural Science Foundation of China (40375014); Funding Program for OutstandingYoung Teachers from the Ministry of Education; Open Project from LASG of the Institute of AtmosphericPhysics of the Chinese Academy of Sciences

摘　　要：The splitting of the Northern Hemisphere sub-tropical high (SH) during spring to summer and its possible mechanisms has been analyzed. Results indicate that the splitting of SH occurs over the Bay of Bengal to the Indo-China peninsula. However, remarkable contrast exists in the Hadley cell at the lower and upper levels over these sectors during March to May. The land surface sensitive/latent heating both play an important role, and decay the local Hadley cell over the Indo-China peninsula by enhancing the upwelling. In contrast, the dominant land surface sensitive heating over the Bay of Bengal only damages the low-level Hadley cell. Thus, the splitting of SH should occur over the Indo-China peninsula, rather than the Bay of Bengal at lower levels. In addition, the analysis suggests that the faster seasonal snow melting in the east of Indo-China peninsula can enhance the land surface sensitive heating atmosphere and weaken the local Hadley cell, such seasonal change benefits the splitting of the SH.The splitting of the Northern Hemisphere sub-tropical high (SH) during spring to summer and its possible mechanisms has been analyzed. Results indicate that the splitting of SH occurs over the Bay of Bengal to the Indo-China peninsula. However, remarkable contrast exists in the Hadley cell at the lower and upper levels over these sectors during March to May. The land surface sensitive/latent heating both play an important role, and decay the local Hadley cell over the Indo-China peninsula by enhancing the upwelling. In contrast, the dominant land surface sensitive heating over the Bay of Bengal only damages the low-level Hadley cell. Thus, the splitting of SH should occur over the Indo-China peninsula, rather than the Bay of Bengal at lower levels. In addition, the analysis suggests that the faster seasonal snow melting in the east of Indo-China peninsula can enhance the land surface sensitive heating atmosphere and weaken the local Hadley cell, such seasonal change benefits the splitting of the SH.

关 键 词：seasonal transition sub-tropical high splitting mechanism analysis 

分 类 号：P424.4[天文地球—大气科学及气象学]