2007年海气热通量影响南海夏季风爆发数值试验  

A Numerical Study on the Impact of Air-Sea Heat Fluxes on the Onset of Summer Monsoon of South China Sea in 2007

作　　者：梁卫[1] 李秀珍[1] 

机构地区：[1]中山大学季风与环境研究中心/大气科学系,广州510275

出　　处：《中山大学研究生学刊（自然科学与医学版）》2009年第3期82-89,共8页Journal of the Graduates Sun YAT-SEN University(Natural Sciences.Medicine)

摘　　要：本文利用RegCM3区域气候模式对2007年季风爆发前后南海海气热通量进行了数值模拟试验,探讨海气热通量对南海地区季风爆发以及相应变量场的影响得出以下结论:(1)RegCM3对南海降水、地面气温、500hPa位势高度场以及850hPa风场模拟整体偏弱,但是对各变量场的空间分布形势具有较好的模拟能力。(2)潜热、感热通量的变化对季风的爆发以及相应的变量场有重要影响,当去除潜热、感热通量后,南海低层基本受较强偏东风控制,500hPa位势高度有所偏高,副高偏西偏强,季风爆发严重偏晚,不利于南海地区水汽辐合抬升,使得降水大幅减少,大片海域甚至无降水出现;当潜热、感热加倍后,南海低层120°E以西基本受偏西风控制,风速明显加大,同时500hPa位势高度明显偏低,副高偏东偏弱,季风爆发偏早,有利于水汽在南海地区辐合,造成降水显著增多。Using a region climate model RegCM3, a control experiment and sensitive experiments are run to simulate the impact of sir-sea heat fluxes on the onset of summer monsoon of South China Sea （SCS） in 2007, It is shown that ： （ 1 ） The precipitation, surface temperature, 500hPa geopotential height and the 850hPa wind of SCS are simulated weak by the model RegCM3, but their spatial distribution are well simulated; （2） sensitive heat flux and latent heat flux show great impact on the onset of summer monsoon of SCS, without them, SCS is controlled by easterlies, 500hPa geopotential height is higher than normal, the subtropical high is stronger and on the west, the onset date is late, when the latent heat and sensible heat are doubled, it almost Shows the contrary.

关 键 词：区域气候模式REGCM3 海气热通量 季风 降水场 500hPa位势 高度场 850hPa风场 

分 类 号：P425.4.2[天文地球—大气科学及气象学] P404