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基于CloudSat卫星观测的贵州冻雨形成机制分析
杨寅1, 赵春霞2, 宫宇1
(1.国家气象中心;2.贵州省毕节市气象局)
Analysis on Mechanisms of Freezing Precipitation in Gui Zhou Province Using CloudSat Data
yangyin1, Zhao chunxia2, Gong yu1
(1.National Meteorological Center;2.Bijie meteorological observatory, Guizhou)
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投稿时间:2017-08-10    修订日期:2018-02-11
中文摘要: 利用CloudSat卫星观测资料,从云物理观测和温度垂直结构角度对贵州地区冻雨形成机制进行分析。结果表明,对冰相机制的冻雨,CloudSat卫星的CPR雷达反射率、云冰含量和温度廓线产品能够描述冰相降水粒子在融化层中相变为液态水的“融冰”过程,雷达反射率回波零度层亮带是该过程的直接反映,云冰含量产品也能够反映融化层对冰相降水粒子的融化作用。对“过冷暖雨”机制的冻雨,CloudSat卫星能够描述降水粒子在整层气温低于0℃的环境中保持过冷水状态下落的过程。研究基于云物理观测证实贵州冻雨存在一种具有融化层的暖雨机制,其大气存在着具有融化层的逆温结构,降水粒子在融化层中为普通液态水,在温度略低于0℃的环境中为过冷水,过冷水下落经过融化层时升温变为普通液态水,再继续下落进入次冻层冷却,最后与低于0℃的地面物体碰并冻结形成冻雨。冻雨形成机制不能通过融化层区分。
Abstract:The observation of satellite CloudSat were used to analysis the mechanisms of freezing precipitation in Guizhou province. Result shows that, to freezing precipitation of Guizhou which belonged to the ice-phased mechanism, reflectivity of cloud profile radar, ice water content and temperature profile of CloudSat data could make the processes of ice phase particle melting into liquid depicted clearly. Bright band of reflectivity at 0℃ of cloud profile radar were the reflection of melting process and ice water content data could represent the melting process in melting layer also. To the super-cooled warm rain mechanism of freezing rain, CloudSat data could depict the process of precipitation particle kept in liquid of super-cooled in environment of temperature blew 0℃ vertically. This research proved that Guizhou province had a mechanism of freezing precipitation based on observation of cloud-physics, which could be named as warm rain mechanism with melting layer. With the existence of melting layer in vertical temperature profile, precipitation particles existed with status of liquid in melting layer and kept in super-cooled in environment of temperature blew 0℃. Liquid precipitation particles of super-cooled could be heated when falling into melting layer and frosted to super-cooled droplet in freezing layer below, collided and frosted with surface objects with temperature below 0℃ at last. Melting layer could not be used to distinguish mechanism of freezing precipitation.
文章编号:201708100382     中图分类号:    文献标志码:
基金项目:国家重点研发计划(2016YFC0402702)、安徽省自然科学基金青年项目(1708085QD89)、国家自然科学基金项目(51509043、41775111)和国家气象中心水文气象预报团队项目
引用文本:
杨寅,赵春霞,宫宇,0.[en_title][J].Meteor Mon,():-.
yangyin,Zhao chunxia,Gong yu,0.Analysis on Mechanisms of Freezing Precipitation in Gui Zhou Province Using CloudSat Data[J].Meteor Mon,():-.