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《Journal of Arid Meteorology》 2017-04
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Characteristics of Cloud Vertical Structure Based on Threshold Method of Relative Humidity in Shenyang

SUN Li;ZHAO Shuhui;ZHANG Jinguang;YUAN Jian;JIN Bo;SONG Huaiyu;QIN Xin;LIU Yang;FANG Bin;Weather Modification Office of Liaoning Province;Hunnan Meteorological Station of Liaoning Province;  
Based on L-band sounding data and cloud ground observation data at Shenyang station from 2006 to 2015,the reliability of using threshold method of relative humidity to recognize cloud in Shenyang region was discussed,and then the vertical structure of cloud parameters including the location and thickness of cloud layers,cloud-top height,cloud-base height,etc,was quantitatively analyzed based on this method. The results show that the accuracy of cloud identification in Shenyang region based on the threshold method of relative humidity was above 75%,which was consistent well with the observation. About 60. 7% sounding profiles could identify the cloud in Shenyang,and the frequency of cloud occurrence was the highest in summer(75. 7%) and the lowest in autumn(52. 6%). In general,the single-layer clouds were dominant under the cloudy condition,but the occurrence frequency of multi-layer clouds was higher than that of single-layer clouds in summer,and the frequency of multi-layer clouds decreased with the increase of cloud layer number. The differences of cloud vertical structure were significant with the change of seasons and number of cloud layers. Moreover,the thickness of clouds and their interlayer was below 2 km,which decreased with the increase of cloud layers number.
【Key Words】: L-band sounding cloud identification cloud vertical structure cloud occurrence frequency
【Fund】: 辽宁省青年英才科研专项“辽宁省人工增雨作业云系性质和垂直结构特征研究”;; 辽宁省气象局科研项目“辽宁省云宏微观特征分析及其与降水的相关性研究”和“GPS/PWV资料在辽宁省强对流天气中的应用研究”共同资助
【CateGory Index】: P426.5
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