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地面激光雨滴谱仪反演降水参量的特性探究
沙修竹, 丁建芳
(河南省人工影响天气中心)
Study on the Characteristics of Precipitation Parameters Reflected by Ground Laser Raindrop Spectrometer
SHA Xiuzhu, DING Jianfang
(The Weather Modification Center of Henan Province)
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投稿时间:2018-09-28    修订日期:2019-04-03
中文摘要: 采用河南省2016~2017年100个日降水资料,对比分析雨滴谱反演回波与雷达回波的差异、雨滴谱反演降水强度与雨量计观测降水强度的差异;进行雨滴谱Gamma拟合,以探究河南省雨滴谱分布及降水云系类型;进行Z-I关系拟合,以探究河南省降水回波与降水强度的关系。结果表明:(1)雨滴谱反演回波、雷达观测回波的变化趋势具有较好一致性。而前者普遍小于后者,其可能原因:一是雷达通过最低仰角观测到的地面雨滴谱仪上方回波与地面雨滴谱仪之间存在一定高度差,二是雨滴下落时的蒸发、破碎过程,使到达地面的雨滴直径减小。(2)雨滴谱反演的降水强度与雨量计观测的降水强度相比,存在一定差异,但无显著偏大或偏小规律性特征。(3)对流云及层积混合云的雨滴谱宽大于层状云,中等尺度雨滴数密度较大。层状云的小水滴数密度较大。河南省大部分降水过程为雨滴谱较窄的层状云降水。(4)河南省降水回波与降水强度的拟合公式:Z=262?I1.34,层状云拟合公式:Z=219?I1.30,对流云拟合公式:Z=307?I1.38。(5)雨滴数浓度较高月份为6~7月(1500个?m-3左右),降水强度较高月份为8~10月(>60mm?h-1),雨滴最大直径较高月份为4~8月(4.3~4.8mm),雨滴平均直径较高月份为3~4月(3mm左右)。雨滴数浓度、降水强度、最大直径、平均直径的月份特征变化无一致性。
Abstract:The precipitation data of 100 days from 2016 to 2017 in Henan province was adopted. The difference of raindrop spectrum inversion echo and radar echo, raindrop spectrum inversion precipitation intensity and rain gauge observation precipitation intensity, was used for comparative analysis. Gamma fitting of raindrop spectrum was used to explore raindrop spectrum distribution and precipitation cloud types in Henan province. Z-I fitting was used to explore fitting relationship between precipitation echo and precipitation intensity in Henan province. Results show that: (1)The variation trend of raindrop spectrum inversion echo and radar echo have good consistency. The former is generally less than the latter, possible causes: There was a certain height difference between radar echo above ground raindrop spectrometer that observed through the lowest elevation angle and ground raindrop spectrometer, or the evaporation process when raindrops fell, could reduce the diameter of raindrops reached the ground. (2) There was a certain difference between raindrop spectrum inversion precipitation intensity and rain gauge observation precipitation intensity, but there was no obvious large or small regularity. (3) The raindrop spectrum of convective cloud and laminar mixed cloud was wider than that of laminar cloud, the density of medium scale raindrops was larger. The density of small droplets in laminar cloud was larger. Most precipitation processes in Henan province were Stratiform precipitations with narrower raindrops spectrum. (4)The fitting formula of precipitation echo and precipitation intensity in Henan province: Z=262?I1.34, the fitting formula of laminar cloud:Z=219?I1.30, the fitting formula of convective cloud:Z=307?I1.38. (5) The raindrop concentrations between June and July were higher(about 1500 ?m-3), the precipitation intensitys between August and October were higher(>60mm?h-1), the maximum diameters of raindrops between April and August were higher(4.3~4.8mm), the mean diameters of raindrops between March and April were higher(approximately 3mm). There was no consistency in the monthly feature changes of four precipitation microphysical quantities.
文章编号:201809280423     中图分类号:    文献标志码:
基金项目:基于多探测方式的人工增雨物理检验方法建立与应用(KM201923)、河南省层状云(层积混合云)降水地面雨滴谱特征的观测研究专项(Z201507)共同资助
引用文本:
沙修竹,丁建芳,0.[en_title][J].Meteor Mon,():-.
SHA Xiuzhu,DING Jianfang,0.Study on the Characteristics of Precipitation Parameters Reflected by Ground Laser Raindrop Spectrometer[J].Meteor Mon,():-.