摘要
就一次出梅时西太平洋副热带高压北进过程，用数值试验的方法，对副高北进的原因进行了分析研究，重点分析了非绝热过程在副高北进过程中所起的作用。结果表明：１）对应出梅时的环流形势，大气内部的动力调整过程具有使副高增强北进的趋势，是副高北进的主导因子。２）在３～５天时间尺度上，非绝热过程的作用不可忽视，其总效应使副高减弱。就各非绝热因子而言，净辐射过程的总效应使副高减弱，不利副高北进；降水凝结潜热释放有利副高的维持和增强，有利副高北进。就地区而言，南亚季风区加热具有同副高南侧热带辐合带加热相同的作用，正的加热增强有利副高增强北进。
As far as one case is concerned, during which the subtropical high over the western Pacific(SH) moved to northwest and Meiyu at the Yangtze River valley ended up, the causes of enhance of SHare studied by means of numerical experiments; especially the roles of diabatic processes such as radiation, precipitation and heating over South--Asia monsoon area are analyzed. The results indicate: (1 ) forthe circulation pattern in which Meiyu will end, adiabatic dynamic adjusting processes tends to enhanceSH and are the main cuase of SH moved to northwest, (2) diabatic heating plays unignoredly roles inenhancing the subtropical high on medium--range scales of 3~ 5 days, and the net effect of diabaticheating lessens SH. As for the factors of diabatic heating, total effect of radiation processes lessens thesubtropical high, the latent heating released by precipitation benefits on the maintenance and enhanceof the subtropical high. As for the location, the heating over South--Asia monsoon area plays the samerole as that in the ITCZ to south of the subtropical high, and is in favor of the enhancement ofsubtropical high and northwest movement
出处
《大气科学》
CSCD
北大核心
1999年第3期296-307,共12页
Chinese Journal of Atmospheric Sciences
基金
中国科学院大气物理研究所所长基金
国家自然科学基金!49505068
关键词
副高带高压
增强北进
个例数值研究
气压
subtropical high ,western Pacific, movement to north, numerical experiment
