广州双偏振天气雷达在短时强降水中的初步应用
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摘要
利用广州双偏振天气雷达和自动气象站资料,对2016年5月10日影响广州地区的一次短时强降水过程的双偏振参量进行了分析,结果表明:短时强降水的差分反射率因子(ZDR)、差分相移率(KDP)都随着回波强度(ZH)的增加而增大,最大值分别达到了4 d B和4(°)/km;选择了10个1 h雨量>50 mm的自动站点,计算其对应的ZDR平均值在1.25~1.66 d B之间,最大值在1.65~3.19 d B之间;KDP的平均值在0.8~1.48(°)/km、最大值在1.8~2.4(°)/km之间;相关系数的平均值都在0.95以上,最大值接近于1。较大的ZDR和KDP值表明降水粒子谱中含有大量较大的水滴,是造成该次短时强降雨的主要原因。
With the data of a dual polarization weather radar and automatic weather stations( AWSs) in Guangzhou,we analyzed the dual polarization parameters of a short-range intensive rain that affected the metropolis on May 10,2016. The result is shown as follows. During the rain,both the factors of differential reflectivity( ZDR) and differential phase shift( KDP) increased with the increase of echo intensity( ZH),with the maximum reaching 4 d B and 4( °)/km respectively. Ten AWSs for which 1 h rainfall > 50 mm were selected to determine their corresponding mean values,which were between 1. 25 and 1. 66 d B,with the maximum between 1. 65 and 3. 19 d B. The mean value of KDPranged from 0. 8 to 1. 48,with the maximum between 1. 8 and 2. 4( °)/km. The mean value of correlation coefficient was all above 0. 95,with the maximum close to 1. The main cause of this short-range intensive rain was that the spectrum of rain particulates contains a large amount of relatively large-sized raindrops,as shown in the relatively large values of Z_(DR) and K_(DP).
With the data of a dual polarization weather radar and automatic weather stations( AWSs) in Guangzhou,we analyzed the dual polarization parameters of a short-range intensive rain that affected the metropolis on May 10,2016. The result is shown as follows. During the rain,both the factors of differential reflectivity( ZDR) and differential phase shift( KDP) increased with the increase of echo intensity( ZH),with the maximum reaching 4 d B and 4( °)/km respectively. Ten AWSs for which 1 h rainfall > 50 mm were selected to determine their corresponding mean values,which were between 1. 25 and 1. 66 d B,with the maximum between 1. 65 and 3. 19 d B. The mean value of KDPranged from 0. 8 to 1. 48,with the maximum between 1. 8 and 2. 4( °)/km. The mean value of correlation coefficient was all above 0. 95,with the maximum close to 1. The main cause of this short-range intensive rain was that the spectrum of rain particulates contains a large amount of relatively large-sized raindrops,as shown in the relatively large values of Z_(DR) and K_(DP).
引文
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[3]胡胜,胡东明,汪巧,等.双线偏振多普勒雷达及其探测技术的应用[J].广东气象,2006,28(4):12-16.
[4]王致君.偏振气象雷达发展现状及其应用潜力[J].高原气象,2002,21(5):495-500.
[5]董振贤,李妙英.双偏振多普勒天气雷达的偏振量及其应用[J].解放军理工大学学报(自然科学版),2004,5(3):98-102.
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[7]张杰,田密,朱克云,等.双偏振雷达基本产品和回波分析[J].高原山地气象研究,2010,30(2):36-41.
[8]郑佳锋,张杰,朱克云,等.双偏振天气雷达测雨误差及水凝物识别分析[J].气象科技,2014,42(3):364-372.
[9]吴林林.利用雨滴谱对移动双偏振雷达进行质量控制及降水估测[D].北京:中国气象科学研究院与南京信息工程大学,2014.
[10]杜牧云,刘黎平,胡志群,等.C波段双线偏振多普勒雷达资料质量分析[J].暴雨灾害,2011,30(4):328-334.
[11]王林,刘八一,黄应喜,等.一次暴雨天气过程的双偏振多普勒天气雷达资料分析[J].气象与减灾,2011专刊.