海洋气象学报2024，Vol.44Issue(3)：14-22,9.DOI:10.19513/j.cnki.hyqxxb.20230129002
两次森林火灾的双偏振雷达探测特征分析
Analysis on detection characteristics of two forest fires using dual-polarization radars
摘要
Abstract
Two forest fires occurred in Yantai and Qingdao,Shandong on 17 March and 23 April 2020,respectively,and the detection data using dual-polarization radars are analyzed.The results are as follows.(1)Ashes from forest fires rise up into the air and drift downstream to form a smoke plume,whose radar reflectivity is around 20 dBZ,with a maximum of 36 dBZ in the small range above the fire spot.(2)The farthest distance of the two wildfires'floating objects spreading downstream in the environmental wind direction is 65 km and 94 km,respectively,and the highest rising height reaches 3.7 km and 4.8 km,respectively.(3)The environmental wind speed of corresponding altitude can be estimated by tracking the plume's front edge.Both wildfires occur on sunny days,the environmental wind speed is not large,and except for the large velocity spectrum width at the plume's edge,the velocity spectrum width is very small,mostly at 1-2 m·s-1.(4)The ranges detected by correlation coefficient(Cc),differential reflectivity(ZDR)and differential phase shift(ΦDP)are close to the evolution and area of the radar reflectivity,and also increase gradually along with the diffusion of the plume.The value of C is very small with the values of most sites less than 0.9 and the values of a few range bins under 0.5.There is a part of relatively small ZDR over the fire spot between 2 dB and 3 dB,while in the downwind direction,ZDR is large,mostly over 5 dB.(5)The detection characteristics of the two forest fires using dual-polarization radars show that the reflectors of generating echoes are mainly non-spherical particle reflectors with large horizontal scale produced by ashes such as hay and pine needles.关键词
山火烟羽/双偏振雷达/相关系数(Cc)/差分反射率(ZDR)/探测特征Key words
smoke plume of wildfire/dual-polarization radar/correlation coefficient(Cc)/differential reflectivity(ZDR)/detection characteristics分类
天文与地球科学引用本文复制引用
朱君鉴,苏添记,龚佃利,张持岸,孙剑..两次森林火灾的双偏振雷达探测特征分析[J].海洋气象学报,2024,44(3):14-22,9.基金项目
山东省气象局科研项目(2021sdqxz09) （2021sdqxz09）
