中尺度对流系统红外云图云顶黑体温度的分析

CLOUD TOP BLACKBODY TEMPERATURE ANALYSIS OF INFRARED SATELLITE IMAGE FOR MESOSCALE CONVECTIVE SYSTEM

中文关键词:  卫星云图  中尺度对流复合体  云顶温度

英文关键词:Satellite cloud picture  Mesoscale convective complex  Cloud top temperature

中文摘要:

      采用GMS卫星红外云图的云顶黑体温度(TBB)等值线分析方法,对1992年8月初在中国3个地区,不同环流背景下发生的中尺度对流系统(MCS),即西南低涡内、西太平洋副热带高压的西北边缘和副高内部的MCS进行了分析。结果表明,TBB等值线分析方法能较细致地揭示MCS的形成过程。冷云盖周围TBB等值线疏密所反映的云顶温度梯度,对MCS的发展有很好的指示意义。文中还给出了一个在消散阶段出现涡旋状结构的MCS.这种涡旋结构不同与北美发现的中层中尺度气旋,它可能是凝结加热所产生的对流层高层的高压反气旋环流的反映。

英文摘要:

      The blackbody temperature (TBB) of GMS satellite infrared images was analyzed for mesoscale convective systems (MCS) occuring in different regions of China in early August 1992. The evolution of three cases of MCSs,which located in the vortex of southwestern China,around the northwesternborder of the subtropical high and within the subtropical high,are given by the TBB isoline maps in detial. The results suggest that the density of the TBB isolines around the cold cloud top is a available clue to the nowcasting of MCS. One of MCS,which evolved into a vortex when it entered into the dissipating phase,was documented in this paper. The spirlling banded structure of the dissipating MCS reflects the upper level mesoscale high caused by the convective latent heating associated with the MCS.