Cloud type identification for a landfalling typhoon based on millimeter-wave radar range-height-indicator data  

作　　者：Zhoujie CHENG Ming WEI Yaping ZHU Jie BAI Xiaoguang SUN Li GAO 

机构地区：[1]Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science&Technology,Nanjing 210001,China [2]Beijing Institute of Aviation Meteorology,Beijing 100085,China [3]Beijing Marine Hydrometeorologic Centre,Beijing 100071,China [4]Beijing Meteorological Centre,Beijing 100038,China [5]Taizhou Meteorological Bureau of Zhejiang Province,Taizhou 317000,China

出　　处：《Frontiers of Earth Science》2019年第4期829-835,共7页地球科学前沿（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(Grant No.41675029);the National Basic Research Program of China(No.2013CB430102).

摘　　要：As a basic property of cloud,accurate identification of cloud type is useful in forecasting the evolution of landfalling typhoons.Millimeter-wave cloud radar is an important means of identifying cloud type.Here,we develop a fuzzy logic algorithm that depends on radar range-height-indicator(RHI)data and takes into account the fundamental physical features of different cloud types.The algorithm is applied to a ground-based Ka-band millimeter-wave cloud radar.The input parameters of the algorithm include average reflectivity factor intensity,ellipse long axis orientation,cloud base height,cloud thickness,presence/absence of precipitation,ratio of horizontal extent to vertical extent,maximum echo intensity,and standard variance of intensities.The identified cloud types are stratus(St),stratocumulus(Sc),cumulus(Cu),cumulonimbus(Cb),nimbostratus(Ns),altostratus(As),altocumulus(Ac)and high cloud.The cloud types identified using the algorithm are in good agreement with those identified by a human observer.As a case study,the algorithm was applied to typhoon Khanun(1720),which made landfall in south-eastern China in October 2017.Sequential identification results from the algorithm clearly reflected changes in cloud type and provided indicative information for forecasting of the typhoon.

关 键 词：landfalling typhoon identification of cloud type millimeter-wave cloud radar RHI data fuzzy logic 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]