基于MODIS多通道合成的江淮暴雨云系分析方法

卫星多通道合成能直观反映出卫星云图上的一些特性,通过采用经过预处理后的MODIS多通道数据,利用“白天自然色”、“白天微物理”、“白天太阳”和“空气团”4种多通道组合,结合实况降水分布和地面气象观测站点资料,以2010年7月13日江淮流域的一次特大暴雨过程为例,定性分析暴雨云系微观物理性质,推断云粒子大小和相态等,并对比高时空分辨率的局地分析预报系统(LAPS)中尺度物理量场以及不同研究个例的多通道合成图分析。结果表明：卫星多通道RGB合成图能以色彩的形式有针对性地突出对流系统、云粒子微观物理性质等属性,具有一定的精确度和普适性,有利于暴雨等中尺度强对流天气的监测。

Based on the MODIS Multi-channel Synthetic of the Jianghuai Rainstorm Cloud Systems Analysis Methods

Satellite multi-channel synthetic can reflect some features on the meteorological satellite imagery directly.This paper adopts MODIS multi-channel data after pretreatment,and uses "Day natural colors","Day microphysical","Day solar","Air mass" multi-channel RGB synthetic methods.This study combines with the actual rainfall distribution and the ground meteorological observation station data,taking once heavy rainstorm process in jianghuai river on July 13,2010 for example to qualitative analysis the microcosmic physical properties of severe convective process cloud systems on the satellite cloud picture and deduce cloud particles size and phasestate et al,also contrasts high temporal and spatial resolutions "Local Analysis Prediction System(LAPS)" mesoscale physical quantity fields and multi-channel combining analysis.The results show that satellite multi-channel RGB synthetic images can make pointed references extrude convection systems,cloud particles microcosmic physical properties etc in the form of color,and have definite accuracy and applicability,in favor of mesoscale severe convective weather monitoring such as heavy rainstorm.