Relationship between cloud characteristics and radar reflectivity based on aircraft and cloud radar co-observations

被引:7
|
作者
Zong Rong [1 ,2 ]
Liu Liping [2 ]
Yin Yan [1 ]
机构
[1] Nanjing Univ Informat Sci & Technol, Key Lab Atmospher Phys & Environm, China Meteorol Adm, Nanjing 210044, Jiangsu, Peoples R China
[2] Chinese Acad Meteorol Sci, State Key Lab Severe Weather, Beijing 100081, Peoples R China
基金
中国国家自然科学基金;
关键词
aircraft; millimeter wavelength cloud radar; droplet size distribution; reflectivity; liquid water content; MICROPHYSICAL PROPERTIES; STRATOCUMULUS CLOUDS; STRATIFORM CLOUDS; EFFECTIVE RADIUS; CUMULUS CLOUDS; DOPPLER RADAR; WATER-CONTENT; LIQUID WATER; DRIZZLE; PRECIPITATION;
D O I
10.1007/s00376-013-2090-7
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
Cloud properties were investigated based on aircraft and cloud radar co-observation conducted at Yitong, Jilin, Northeast China. The aircraft provided in situ measurements of cloud droplet size distribution, while the millimeter-wavelength cloud radar vertically scanned the same cloud that the aircraft penetrated. The reflectivity factor calculated from aircraft measurements was compared in detail with simultaneous radar observations. The results showed that the two reflectivities were comparable in warm clouds, but in ice cloud there were more differences, which were probably associated with the occurrence of liquid water. The acceptable agreement between reflectivities obtained in water cloud confirmed that it is feasible to derive cloud properties by using aircraft data, and hence for cloud radar to remotely sense cloud properties. Based on the dataset collected in warm clouds, the threshold of reflectivity to diagnose drizzle and cloud particles was studied by analyses of the probability distribution function of reflectivity from cloud particles and drizzle drops. The relationship between reflectivity factor (Z) and cloud liquid water content (LWC) was also derived from data on both cloud particles and drizzle. In comparison with cloud droplets, the relationship for drizzle was blurred by many scatter points and thus was less evident. However, these scatters could be partly removed by filtering out the drop size distribution with a large ratio of reflectivity and large extinction coefficient but small effective radius. Empirical relationships of Z-LWC for both cloud particles and drizzle could then be derived.
引用
收藏
页码:1275 / 1286
页数:12
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