气候变化领域集成服务门户(CCPortal): An improved self-consistent approach to attenuation correction for C-band polarimetric radar measurements and its impact on quantitative precipitation estimation

CCPortal

DOI	10.1016/j.atmosres.2019.03.006
	An improved self-consistent approach to attenuation correction for C-band polarimetric radar measurements and its impact on quantitative precipitation estimation
	Gou Y.; Chen H.; Zheng J.
发表日期	2019
ISSN	0169-8095
起始页码	32
结束页码	48
卷号	226
英文摘要	Attenuation correction of measured reflectivity (ZH) and differential reflectivity (ZDR) is critical in short-wavelength radar applications, especially during extreme precipitation events such as heavy rain. This paper develops an improved self-consistent approach (improved ZPHI method) for attenuation correction in practical environment. In particular, a non-negative constraint is imposed on the specific attenuation, which is inferred from the monotonic increasing characteristic of differential propagation phase (ΦDP). The copolar correlation coefficient (ρHV) is used to partition the ΦDP profiles into independent range segments, which are featured by different hydrometeor phases such as liquid rain or mixed-phase precipitation. Additional minimization constraint is imposed on the cost function of the difference between preprocessed ΦDP and reconstructed ΦDPto ensure its appropriate convergence. In addition, an exponential ZDR − ZH relation derived from local raindrop size distribution (DSD) data is applied in the procedure of ZDR correction. Polarimetric measurements from a C-band radar (CPOL) in Hangzhou of China during two extreme precipitation events are used to demonstrate the improved attenuation correction method. DSD observations from disdrometers and radar data from a nearby system operating at non-attenuated frequency (i.e., S-band) at Huangshan Mountain are used to evaluate the attenuation correction performance. This paper also studies the impact of attenuation correction on the radar-derived quantitative precipitation estimation (QPE) product, through cross-comparison with rain gauge observations. Results show that the polarimetric observations from CPOL radar are effectively enhanced and more consistent with collocated S-band measurements and the simulated radar moments based on DSD data. Hourly rainfall products derived from R(ZH) and R(ZH, ZDR) are significantly improved, which are comparable to R(KDP) after attenuation correction. © 2019 Elsevier B.V.
英文关键词	Attenuation correction; C-band; Polarimetric radar; Quantitative precipitation estimation
语种	英语
scopus关键词	Cost functions; Polarimeters; Radar; Rain; Rain gages; Reflection; Soil moisture; Attenuation correction; Attenuation correction method; C-bands; Differential propagation phase; Extreme precipitation events; Polarimetric radar measurements; Polarimetric radars; Quantitative precipitation estimation; Radar measurement; correction; estimation method; extreme event; precipitation assessment; quantitative analysis; radar; raindrop; rainfall; size distribution; Anhui; China; Hangzhou; Mount Huang; Zhejiang
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/162076
作者单位	Hangzhou Meteorological Bureau, Hangzhou, 310051, China; Zhejiang Institute of Meteorological Sciences, Hangzhou, 321000, China; Physical Sciences Division, NOAA/Earth System Research Laboratory, Boulder, CO 80305, United States; Cooperative Institute for Research in the Atmosphere, Colorado State University, Fort Collins, CO 80523, United States; School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu, 610225, China
推荐引用方式 GB/T 7714	Gou Y.,Chen H.,Zheng J.. An improved self-consistent approach to attenuation correction for C-band polarimetric radar measurements and its impact on quantitative precipitation estimation[J],2019,226.
APA	Gou Y.,Chen H.,&Zheng J..(2019).An improved self-consistent approach to attenuation correction for C-band polarimetric radar measurements and its impact on quantitative precipitation estimation.Atmospheric Research,226.
MLA	Gou Y.,et al."An improved self-consistent approach to attenuation correction for C-band polarimetric radar measurements and its impact on quantitative precipitation estimation".Atmospheric Research 226(2019).