1998年地面加热场的基本特征及其与南海夏季风爆发的可能联系  

BASIC CHARACTERISTIC OF SURFACE HEAT FIELD IN 1998 AND THE POSSIBLE CONNECTIONS WITH THE SCS SUMMER MONSOON ONSET

作　　者：王世玉[1] 钱永甫[1] 

机构地区：[1]南京大学大气科学系,南京210093

出　　处：《气象学报》2001年第1期31-40,共10页Acta Meteorologica Sinica

基　　金：国家攀登项目"南海季风试验";高等学校博士学科点专项科研基金资助课题"南海季风区海气相互作用机制研究"联合资助

摘　　要：文中对 1 998年 1月 1日到 8月 31日共 2 4 3d的南海季风试验再分析资料的地面感热场和潜热场进行 EOF分析 ,由感热的第一特征向量场发现 ,中南半岛地区、青藏高原的东北部和印度半岛的大部分是感热通量大值区 ,而海洋上是小值区 ,海陆热力差异十分明显 ,这种海陆感热对比是促使季风爆发的大背景。由感热的时间经度演变图可以看出 ,中南半岛所在经度范围内南北连续的感热分布对南海季风的早爆发具有重要作用。由温度平流项的分布可发现 ,中南半岛的加热作用明显早于青藏高原地区 ,使得中南半岛对南海季风的早期爆发有重要作用 ,而青藏高原对于南海季风的维持具有重要意义。由于印度半岛与中南半岛的海陆分布的差异 。The fluxes of sensible heat and latent heat in the South China Sea(SCS) and its neighboring regions are expanded by means of EOF in this paper based on the reanalyzed data of the SCSMEX from Jan.1 to Aug.31,1998.It is found that there exist three areas with higher values of sensible heat in the Indochina Peninsula ,the northeastern Tibetan Plateau and the most part of the Indian Peninsula, whereas the area with lower values is located in the sea, therefore the land sea thermal contrast is very obvious. It is the background of monsoon onset. The continuous sensible heat distribution from south to north within the longitude of Indochina Peninsula makes the monsoon firstly onset in SCS region. The heating effect of the Indochina Peninsula is evidently earlier than that of the Tibetan Plateau, therefore, the Indochina Peninsula has an important function in the early onset of the SCS monsoon, while the Tibetan Plateau has an important effect on the maintenance of the monsoon. The temperature advection in the Indian Peninsula and the Indochina Peninsula are different because of the land sea thermal differences in these two regions.

关 键 词：南海 季风 海陆热力差异 1998年 地面加热场 地面感热场 潜热场 海气相互作用 

分 类 号：P732.6[天文地球—海洋科学]