doi:  10.3878/j.issn.1006-9895.1805.17307
利用微雨雷达研究一次冷锋云系降水的垂直结构分布及演变特征

Vertical structure distribution and evolution of a cold front cloud system precipitation based on micro rain radar
摘要点击 161  全文点击 55  投稿时间:2017-12-27  修订日期:2018-04-20
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基金:  国家重点基础研究发展计划
中文关键词:  微雨雷达  雨滴谱 垂直分布  微物理过程
英文关键词:  Micro-rain  radar, Drop  size distribution, Vertical  profile, Microphysical  processes
        
作者中文名作者英文名单位
崔云扬Cui Yunyang南京信息工程大学
周毓荃Zhou Yuquan中国气象科学研究院
蔡淼Cai Miao中国气象科学研究院;
引用:崔云扬,周毓荃,蔡淼.2018.利用微雨雷达研究一次冷锋云系降水的垂直结构分布及演变特征[J].大气科学
Citation:Cui Yunyang,Zhou Yuquan,Cai Miao.2018.Vertical structure distribution and evolution of a cold front cloud system precipitation based on micro rain radar[J].Chinese Journal of Atmospheric Sciences (in Chinese)
中文摘要:
      本文利用位于河北邢台测站的Ka波段微雨雷达(MRR)观测到的一次冷锋云系降水过程分析降水垂直分布及演变特征。将MRR与天气雷达、地面雨滴谱仪、雨量计观测结果进行对比以检验MRR数据的可靠性。同时将MRR与雨滴谱仪和激光云高仪结合,研究了不同相对湿度阶段特征量和雨滴谱的平均垂直分布特征和降水特征量随时间和高度的演变特征。结果表明:相比雨量计,MRR和雨滴谱仪探测得到的累计雨量偏小,但三种仪器观测结果较为接近,趋势一致。MRR 200m雨强值与地面雨滴谱仪雨强值偏差最小,平均偏差为0.05mm·h-1,相关系数为0.93。相比雨滴谱仪,MRR观测到的小滴数浓度出现高估,大滴数浓度出现低估,中滴数浓度较为一致。MRR 100m雨滴谱和特征量观测结果均与雨滴谱仪偏差较大,可能是由于受到近地层的干扰。在环境湿度较低时降水受蒸发过程影响很大。降水在云内和云外受不同微物理过程影响,垂直变化特征不同。在降水初期平均反射率和雨强在云底以下明显减小,小滴和中滴平均数浓度明显减小,蒸发作用影响较强。而其余时间段在云底以上随高度降低平均反射率和雨强略有增加,小滴平均数浓度变化较小,中滴大滴平均数浓度增加,表明云底以上有云滴与雨滴间的碰并发生。而在低层,随高度降低平均有效直径明显增加,平均雨滴总数浓度明显减小,小滴平均数浓度显著减小,大滴平均数浓度显著增加,表明在低层雨滴间的碰并作用较强。
Abstract:
      Date collected by the micro rain radar(MRR) which situated in Xingtai city, Hebei province, were used to explore the vertical profile and evolution characteristics of a cold front clouds precipitation event. To examine the dependability, the MRR was compared with the disdrometer, the rain gauge and the result of weather radar. Combining the MRR with the disdrometer and the laser ceilometer, the average vertical profile of the raindrop-size distribution and the characteristic quantity during different relative humidity periods and the evolution characters of the characteristic quantity go with the altitude and time during precipitation has been studied. The main results were obtained that: the cumulative rainfall of the MRR and disdrometer is lower than the rain gauge. But the tendency is same. The rainfall intensity deviation between MRR 200m and the disdrometer is minimum. The mean deviation is 0.05 mm·h-1, the correlation coefficient is 0.93. The large drop concentration and small drop concentration was underestimated and overestimated, respectively, by MRR compared with the disdrometer. Precipitation is greatly affected by the evaporation process at low ambient humidity. Precipitation is affected by different microphysical processes within and outside the cloud, and the vertical variation are different.During the initial stage of precipitation, the average of Z and R was decreases obviously below cloud base height, the average concentration of small and medium drops decreases rapidly in case of the influence of evaporation. At other times the average of Z and R was increased slightly and the average concentration of small drops changed slightly, the mean concentration of medium increased with height above the cloud base height. It indicates that the collisional and coalescence processes have happened between raindrops and cloud droplets above the cloud base height. The average effective diameter increases obviously and the average total concentration of raindrops decreases obviously with decreased in height in the lower height. It shows that the collisional and coalescence processes between raindrops below the cloud base height is stronger.
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