气候变化领域集成服务门户(CCPortal): An improved hydrometeor identification method for X-band dual-polarization radar and its application for one summer Hailstorm over Northern China

CCPortal

DOI	10.1016/j.atmosres.2020.105075
	An improved hydrometeor identification method for X-band dual-polarization radar and its application for one summer Hailstorm over Northern China
	Zhao C.; Zhang Y.; Zheng D.; Zhou Y.; Xiao H.; Zhang X.
发表日期	2020
ISSN	0169-8095
卷号	245
英文摘要	Currently, high-resolution severe storm observations obtained by vehicle-mounted mobile X-band dual-polarization radar (X-pol) are widely used in severe storm structure and dynamics studies; however, the identification of hailstones based on X-pol is still rare, leading to the limited application of X-pol in identifying hydrometeors in the microphysical processes of severe storms. Based on previous works, this study constructs an improved X-pol hydrometeor identification (HID) method for hailstorms; the hydrometeor categories include a rain-hail mixtures (RH) category indicating hailstones are melting or experiencing wet growth, and the correlation coefficient between horizontally and vertically polarized echoes (ρHV) is used to locate the local mixed phase region in storms to avoid misclassifications of hydrometeors resulted by environmental temperature in this local mixed phase region. The improved HID method can see liquid water information above the melting layer; it provides a possibility to observe the microphysical process of hailstones wet growth above the melting layer. Furthermore, this improved HID method was utilized to study the high spatiotemporal resolution data collected by the Institute of Atmospheric Physics of Chinese Academy of Sciences (IAP) X-pol for one summer hailstorm over northern China. The results indicate that the identified RH is consistent with the surface hail record of National weather observatory of China Meteorological Administration (CMA), the specific differential phase (KDP) column is more sensitive than the differential reflectivity (ZDR) column for indicating the updraft zone movement, and we considered that the relative position between the key area of hail (KAH, where above the ZDR column, ZDR ~ −2 to 0 dB, ZH ~ ≥ 50 dBZ) and the updraft zone (indicated by the ZDR, KDP column) will determine the evolution of hail. Furthermore, high-density graupels (HDGs) in the upper layer of the KAH may be the source of RH embryos, and these HDGs collect liquid droplets from the liquid water-rich (LWR) area located behind the KAH to form a large number of RH in the lower layer of the KAH. These characteristics are important for hailstone forecasting and warnings. © 2020 Elsevier B.V.
关键词	Clouds Geophysics Liquids Melting Polarization Precipitation (meteorology)Radar Chinese Academy of Sciences Correlation coefficient Differential reflectivity Environmental temperature Microphysical process Spatio-temporal resolution Specific differential phase X-band dual-polarization radars Storms atmospheric dynamics forecasting method hail hydrometeorology image resolution radar imagery seasonal variation spatiotemporal analysis storm track China
语种	英语
来源机构	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132384
推荐引用方式 GB/T 7714	Zhao C.,Zhang Y.,Zheng D.,et al. An improved hydrometeor identification method for X-band dual-polarization radar and its application for one summer Hailstorm over Northern China[J]. Atmospheric Research,2020,245.
APA	Zhao C.,Zhang Y.,Zheng D.,Zhou Y.,Xiao H.,&Zhang X..(2020).An improved hydrometeor identification method for X-band dual-polarization radar and its application for one summer Hailstorm over Northern China.,245.
MLA	Zhao C.,et al."An improved hydrometeor identification method for X-band dual-polarization radar and its application for one summer Hailstorm over Northern China".245(2020).