摘要
利用机载Ka波段云雷达(an airborne Ka-band Precipitation cloud Radar,KPR)与DMT(Droplet Measurement Technologies)粒子测量系统对山东一次积层混合云进行同步穿云观测。对获取的KPR资料进行飞行轨迹误差订正和数据插值处理,与DMT粒子测量系统计算的云中的液态含水量进行相关性研究。从试验飞行云层中选取了两段云区,共划分成9个时段(累计飞行18 min)展开讨论,其中有3个时段相关性比较好,相关系数超过0.7,并且利用相关系数最大的时段拟合出KPR反射率与云中液态含水量之间的关系式。针对每个时段的粒子特征参数、云滴谱型、冰晶谱型及典型粒子图像展开详细分析,结果表明,较强相关性时段内,大云滴浓度要高于小云滴,且观测粒子多为小于100μm的小粒子;较弱相关性时段,CIP(Cloud Imaging Probe)探头观测到的粒子多为针状或板状冰晶,尺度为毫米量级。
An in-situ observation cross convective-stratiform mixed clouds in Shandong is carried out using an airborne Ka-band Precipitation cloud Radar(KPR)and DMT(Droplet Measurement Technologies)particle measurement system.The correlation is researched between the obtained KPR data,which is processed using flight track error correction and data interpolation,and the liquid water content in the clouds calculated by the DMT particle measurement system.Two cloud fields are selected from the clouds of test flight and the flight are divided into 9 periods(cumulative flight of 18 min).Three of them are relatively well correlated with correlation coefficients exceeding 0.7,and the correlation formula between KPR reflectivity and the liquid water content in the clouds is fitted using the period with the maximum correlation coefficient.Based on the analysis of characteristic parameters,cloud drop size spectrum,ice crystal spectrum,and typical particle images in each period,it is found that the concentration of large cloud droplets is higher than that of small cloud droplets during strongly correlated periods,and the observed particles are mostly smaller than 100μm;while during weakly correlated periods,the particles observed by the CIP(cloud Imaging Probe)are mostly needle-like or plate-like millimeter-sized crystals,which results in relatively big error in the calculation of liquid water content.
作者
王烁
张佃国
郭学良
崔雅琴
樊明月
刘泉
WANG Shuo;ZHANG Dianguo;GUO Xueliang;CUI Yaqin;FAN Mingyue;LIU Quan(Weather Modification Office of Shandong Province, Jinan 250031, China;Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;Shandong Meteorological Information Center, Jinan 250031, China)
出处
《海洋气象学报》
2020年第2期103-112,共10页
Journal of Marine Meteorology
基金
山东省气象局科研项目(2016sdqxm09)
国家自然科学基金项目(41475028,41875172)。
关键词
机载Ka波段云雷达
雷达反射率
液态含水量
airborne Ka-band precipitation cloud radar
radar reflectivity
liquid water content
