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1 September 2006 Characteristics of convective activities over Sumatra areas and its possible factors
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Abstract
Based on TBB data from GMS of Japan, NCEP/NCAR reanalysis data and precipitation data from CPC Merged Analysis of Precipitation (CMAP), an investigation is carried out of seasonal changes of precipitation and convection over Asian-Australian "land bridge" areas and its possible factors. The results show that the precipitation and convection over Sumatra take on clearly seasonal changes with abundant (less) rainfall in winter (summer). The convection over Sumatra moves northwestward rapidly along "land bridge" in the late-April and the early-May (the 25th pentad) and the rainfall shows similar variations. It is the rapid northwestward shifting of convection that affects directly the subsequent enhancement of the convection over Indo-China Peninsula (ICP) area followed by the rupture of the subtropical high (SH) bands in this region leading to South China Sea (SCS) summer monsoon establishment. The zonal wind at lower troposphere in the equatorial Indian Ocean and the cross equatorial flow in 105°E are the main factors associated with the rapid northwestward shifting of convection along "land bridge".
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Lijuan Wang, Zhaoyong Guan, Jinhai He, and Jiangjin Lu "Characteristics of convective activities over Sumatra areas and its possible factors", Proc. SPIE 6301, Atmospheric and Environmental Remote Sensing Data Processing and Utilization II: Perspective on Calibration/Validation Initiatives and Strategies, 63010L (1 September 2006); https://doi.org/10.1117/12.677339
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