A Real-Time Algorithm to Identify Convective Precipitation Adjacent to or within the Bright Band in the Radar Scan Domain

doi:10.1175/JHM-D-20-0005.1

	A Real-Time Algorithm to Identify Convective Precipitation Adjacent to or within the Bright Band in the Radar Scan Domain
	Zhang, Zhe 2,3; Qi, Youcun 2,3; Li, Donghuan 2,3; Zhu, Ziwei 2,3; Yang, Meilin 4; Wang, Nan 1; Yang, Yin 5; Hu, Qiyuan 1
刊名	JOURNAL OF HYDROMETEOROLOGY
	2021-05-01
卷号	22 期号:5 页码:1139-1151
关键词	Algorithms Radars Radar observations Remote sensing Precipitation
ISSN号	1525-755X
DOI	10.1175/JHM-D-20-0005.1
通讯作者	Qi, Youcun(youcun.qi@igsnrr.ac.cn)
英文摘要	Hydrological hazards usually occur after heavy precipitation, especially during strong convection. Therefore, accurately identifying convective precipitation is very helpful for hydrological warning and forecasting. However, separating the convective, bright band (BB), and stratiform precipitation is found to be challenging when the convection is adjacent to or within the BB region. A new convection/BB/stratiform precipitation segregation algorithm is proposed in this study to resolve this challenging issue. This algorithm is applicable for a single radar volume scan data in native (polar) coordinates and consists of four processes: 1) check the freezing (0 degrees C) level to roughly assess whether convection is occurring or not; 2) identify the convective cores through analyzing composite reflectivity (maximum reflectivity for a given range gate among all the sweeps), vertically integrated liquid water (VIL), VIL horizontal gradient, and reflectivity at the levels of 0 degrees, -10 degrees, and above -10 degrees C; 3) delineate the whole convective region through the seeded region growing method by taking account of the microphysical differences between the BB and convective regions; and 4) delineate BB features in the stratiform region. The proposed algorithm utilizes the physical characteristics of different precipitation types for precisely segregating the convective, BB, and stratiform precipitation. This algorithm has been tested with radar data of different precipitation events and evaluated with three months of rain gauge data. The results show that the proposed algorithm performs consistently well for challenging precipitation events with the convection adjacent to or within a strong BB. Furthermore, the proposed algorithm could be used to improve the vertical profile of reflectivity (VPR) correction and reduce the overestimation of rainfall in the BB precipitation region.
资助项目	National Key Research and Development Project[2018YFC1507505] ; National Key Research and Development Project[2018YFC1505803] ; National Key Research and Development Project[2016YFC0400902] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDA2006040101] ; Hundred Talent Program
WOS关键词	ECHO CLASSIFICATION
WOS研究方向	Meteorology & Atmospheric Sciences
语种	英语
出版者	AMER METEOROLOGICAL SOC
WOS记录号	WOS:000651501500005
资助机构	National Key Research and Development Project ; Strategic Priority Research Program of Chinese Academy of Sciences ; Hundred Talent Program
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/162854]
专题	中国科学院地理科学与资源研究所
通讯作者	Qi, Youcun
作者单位	1.Shaanxi Meteorol Bur, Xian, Shaanxi, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing, Peoples R China 4.China Meteorol Adm, Inst Urban Meteorol, Beijing, Peoples R China 5.Natl Meteorol Ctr, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Zhe,Qi, Youcun,Li, Donghuan,et al. A Real-Time Algorithm to Identify Convective Precipitation Adjacent to or within the Bright Band in the Radar Scan Domain[J]. JOURNAL OF HYDROMETEOROLOGY,2021,22(5):1139-1151.
APA	Zhang, Zhe.,Qi, Youcun.,Li, Donghuan.,Zhu, Ziwei.,Yang, Meilin.,...&Hu, Qiyuan.(2021).A Real-Time Algorithm to Identify Convective Precipitation Adjacent to or within the Bright Band in the Radar Scan Domain.JOURNAL OF HYDROMETEOROLOGY,22(5),1139-1151.
MLA	Zhang, Zhe,et al."A Real-Time Algorithm to Identify Convective Precipitation Adjacent to or within the Bright Band in the Radar Scan Domain".JOURNAL OF HYDROMETEOROLOGY 22.5(2021):1139-1151.