基于云雷达资料的那曲对流云粒子相态识别研究  

Recognition of particles phase in convective clouds over Nagqu by using millimeter-wave radar measurements

作　　者：任涛 郑佳锋[1,2] 杨吉 曾正茂 陈绍婕 REN Tao;ZHENG Jiafeng;YANG Ji;ZENG Zhengmao;CHEN Shaojie(School of Atmospheric Sciences,Chengdu University of Information Technology,Chengdu 610225,China;Key Laboratory of Transportation Meteorology,China Meteorology Administration,Nanjing 210019,China;Nanjing Joint Institute for Atmospheric Sciences,Nanjing 210041,China;Fujian Meteorological Information Center Fuzhou 350001,China;Laboratory of Straits Meteorology,Xiamen Meteorological Bureau,Fujian Xiamen 362012,China)

机构地区：[1]成都信息工程大学大气科学学院,成都610225 [2]中国气象局交通气象重点开放实验室,南京210019 [3]南京气象科技创新研究院,南京210041 [4]福建省气象信息中心,福州350001 [5]厦门市气象局海峡气象开放实验室,福建厦门362012

出　　处：《气象科学》2024年第2期382-390,共9页Journal of the Meteorological Sciences

基　　金：基金资助项目(2023J011337);成都信息工程大学人才引进资助项目(KYTZ201728)。

摘　　要：本文利用第三次青藏高原大气科学试验的Ka波段云雷达资料,结合微波辐射计和探空资料,提出了以模糊逻辑算法为框架的相态识别方法,并利用那曲两个典型对流云个例对方法效果进行了分析。通过与前人方法的对比和对不同相态粒子回波强度谱的统计,进一步验证了本文方法的可靠性。结果表明:利用雷达功率谱资料反演下落末速度并代替径向速度作为相态识别的参量之一,可提升对流云内粒子相态分类结果的合理性。零度层亮带和抬升凝结高度参量的使用,能够进一步优化相态识别的初步结果。固态云粒子的下落末速度远低于相同反射率因子的降水粒子,多模态/多谱峰的谱形态特征能够帮助识别混合相态粒子。Based on Doppler spectra of a Ka-band cloud radar in the third Tibetan Plateau Experiment of Atmospheric Sciences Project,relevant microwave radiometer and radiosonde data,an algorithm for identifying particle phase by using fuzzy logic algorithm was proposed,and the effects of the algorithm were analyzed using two typical convective cases.Finally,the method presented in this paper is reliable by comparing with the previous methods and counting intensity spectra of diverse particles.The main findings are as follows:the rationality of phase classification results of particles in convective clouds can be improved by using the particle terminal velocity instead of radial velocity as one of parameters of the phase identification.The preliminary results of phase identification can be further optimized by using the parameters,such as bright band and lifting condensation level.The particle terminal velocity of solid particles is much lower than precipitation particles with the same reflectivity factor.The mixed phase with large particles can be recognized by the multiple modals and multiple peaks of power spectra.

关 键 词：毫米波雷达 相态分类 功率谱 青藏高原地区 对流云 

分 类 号：P412.25[天文地球—大气科学及气象学]