摘要
计算了１９９１年７月４－９日的梅雨锋强降水过程的热源Ｑ１和水汽汇Ｑ２。结果表明，存在着两类云系即对流云和层状云对Ｑ１和Ｑ２的结构产生影响。对流加热发生在强降水区上空，而层状云加热发生在对流区周围的弱降水区上空。在对流加热区，大量的潜热释放形成深厚的热源和水汽汇，热源峰值出现在上部对流层，水汽汇峰值出现在下部对流层；在层状云区，通常０℃层以上为热源和水汽汇，０℃层以下为热汇和水汽源，层状云引起的Ｑ１和Ｑ２比对流云系的要弱。
The main goal of this study is to make a detail investigation of the apparent heat source Q1and apparent moisture sink Q2 on the Meiyu front during the period from 4 to 9 July,1991,when Eastern China had experienced a heavy rain and torrential flood process.Results show that generally there are two types of clouds which have influences on the structure of Q1 and Q2,i.e.convective clouds and stratiform clouds.The convective heating takes place over the heavy rain region,but the stratiform heating occurs over the light precipitation region just next to the convective region.In the convectively heating region latent heat release causes a heating peak in the upper troposphere and a moisture sink in the lower troposphere.In the stratiform region heating and drying occur above the 0℃ level and cooling and moistenning below it.Q1 and Q2 associated with stratiform clouds are smaller than those associated with convective clouds.
出处
《热带气象学报》
CSCD
1995年第1期86-91,共6页
Journal of Tropical Meteorology
基金
85-906攻关项目
08-01
08-05专题
关键词
热源
对流加热
层状云加热
梅雨锋
暴雨过程
Heat source,Moisture sink,Convective heating,Stratiform heating
