热带气象学报2011，Vol.27Issue(2)：209-218,10.DOI:10.3969/j.issn.1004-4965.2011.02.009
东亚下垫面热力异常与南海夏季风爆发早晚和强弱的关系
THE RELATION BETWEEN THE UNDERLYING SURFACE THERMAL ANOMALIES AND THE ONSET AND INTENSITY OF THE SOUTH CHINA SEA SUMMER MONSOON
摘要
Abstract
The earlier and later onset years and stronger and weaker years of the South China Sea summer monsoon(SCSSM) are picked out with the SCSSM Index defined by moist potential vorticity(MPV). By means of EOF, the surface temperature differences of spatial and temporal variations between earlier and later onset years of the SCSSM are analyzed. Three types of years with early, normal, and late EASM onset are selected and the EASM regimes are numerically simulated. It is revealed that when the land surface temperature is higher in the eastern part from 40 °N to north and lower in the western part, and it rises faster in eastern coastal regions and Indian Peninsula during 18-28 pentads, while sea surface temperature in Taiwan Strait is lower, the early onset of the EASM can be expected. The composite analysis of the anomaly fields of the surface sensible heat flux(SHF) and the surface latent heat flux(LHF) in these strong and weak years is conducted. The anomaly fields of the SHF and the LHF in the previous winters occur over and close to the ocean and show the banded distribution going through northeast to southwest along the coastline. There are the positive anomaly fields in these strong and the negative anomaly fields in these weak years. The anomaly fields in spring is usually opposite in winter. The previous analysis validates that the change of the land-sea thermal contrast caused by the underlying surface thermal anomalies have important effect on the onset and intensity of the SCSSM.关键词
气候学/数值试验/南海夏季风/早晚年和强弱年/表面温度和表面通量Key words
climatology/ numerical simulations/ South China Sea summer monsoon/ earlier and later onset years and stronger and weaker years/ surface temperature and surface flux分类
天文与地球科学引用本文复制引用
刘鹏,钱永甫,严蜜..东亚下垫面热力异常与南海夏季风爆发早晚和强弱的关系[J].热带气象学报,2011,27(2):209-218,10.基金项目
科技部公益性行业专项(GYHY200906016) （GYHY200906016）
国家自然科学基金青年项目(41005047) （41005047）
南京信息工程大学科研基金共同资助 （）
