沙漠与绿洲气象2026，Vol.20Issue(1)：100-106,7.DOI:10.12057/j.issn.2097-6801.2403.20004
鄂北短时强降水特征及双偏振雷达预警指标
Characteristics of Short-Duration Heavy Rainfall and Early Warning Indicators with Dual-Polarization Radar in Northern Hubei
摘要
Abstract
Using hourly precipitation data and dual-polarization radar observations from 2019 to 2023 in Suizhou City,Hubei Province,this study statistically analyzes the distribution of short-duration heavy rainfall and the characteristics of dual-polarization radar parameters.The results show that:(1)Short-duration heavy rainfall is concentrated from June to August,with the highest frequency in June and July.Diurnally,it exhibits a triple-peak pattern:the primary peak occurs from 05:00 to 08:00BT followed by a secondary peak from 22:00 to 01:00(the next day),and a tertiary peak from 13:00 to 18:00.Spatially,the southern part of the region is more prone to short-duration heavy rainfall than the central and northern parts,with southern Suixian County being the high-frequency center.(2)Radar parameters exhibiting high positive correlations with rainfall intensity include composite reflectivity(CR),vertically integrated liquid(VIL),and horizontal reflectivity(ZH)and specific differential phase(KDP)at heights below 2.5 km.Differential reflectivity(ZDR)and echo top(ET)also show moderate positive correlations.This indicates that more intense rainfall is associated with stronger radar echoes,higher concentrations of liquid hydrometeors at low levels,higher echo tops,and larger diameters of oblate liquid particles.In contrast,the correlation coefficient(CC)and the maximum echo height show no significant correlation with rainfall intensity.(3)The inferred particle size shows no significant difference between rainfall intensity ranges of 20-30 mm·h-1 and 30-40 mm·h-1,but increases markedly for intensities above 40 mm·h-1.Both the median and mean KDP values exhibit a sharp jump at intensities≥50 mm·h-1,indicating a significant increase in the concentration of liquid hydrometeors at low levels.(4)The increasing trends of the early warning thresholds for CR,ET,VIL,and for ZH,ZDR,and KDP at low levels are not pronounced between the 20-30 mm·h-1 and 30-40 mm·h-1 intensity ranges,but become more substantial above 40 mm·h-1.关键词
短时强降水/分布特征/偏振参量/预警阈值Key words
short-duration heavy rainfall/distribution characteristics/polarization parameters/warning threshold分类
天文与地球科学引用本文复制引用
贺晓露,秦幼文,李格,郝元甲,杨涛..鄂北短时强降水特征及双偏振雷达预警指标[J].沙漠与绿洲气象,2026,20(1):100-106,7.基金项目
2022年湖北省气象局面上项目(2022Y20) （2022Y20）
