气象2026，Vol.52Issue(1)：29-43,15.DOI:10.7519/j.issn.1000-0526.2025.051901
"海葵"残涡的雨滴谱特征及其对S/X波段定量降水估测算法的影响
Characteristics of Raindrop Size Distribution of the Residual Vortex of Typhoon Haikui and Its Impact on the S/X-band QPE Algorithms
摘要
Abstract
Multiple DSG5 raindrop disdrometers are utilized to analyze the raindrop size distribution of the residual vortex of Typhoon Haikui in 2023 in the Pearl River Delta,and the performance of radar quantita-tive precipitation estimation(QPE)algorithms based on observed raindrop size distribution in the S/X-bands is evaluated.The results indicate that the impact of the residual vortex of Haikui on rainfall in the Pearl Riv-er Delta can be divided into two main stages.The first stage is primarily influenced by the convergence of the southwest monsoon and easterly airflow on the eastern side of the vortex itself,with a deep moisture convergence layer.The microphysical processes of rainfall are relatively uniform with higher number con-centrations and relatively small particle sizes of raindrops.The second stage is characterized by severe rain-fall caused by the convergence of southerly winds in the boundary layer on the outskirts of the residual vor-tex,with a shallower moisture convergence layer.The rainfall particles are more dispersed,with more rainfall events featuring large diameters and low number concentration of raindrops.Overall,medium-sized raindrops make a major contribution to the total rainfall amount,but as rainfall intensity increases,the contribution of extremely large raindrops to rainfall intensity at the second stage is significantly higher than that at the first stage.The dual-polarization parameters derived from raindrop size distribution of this process shows that,under the same rainfall intensity(R),horizontal reflectivity factor(ZH),specific dif-ferential phase(KDP),and differential reflectivity(ZDR)at the first stage are smaller than those at the sec-ond stage.The deviation of QPE algorithms in the S/X-bands calculated based on disdrometers data shows that,R(ZH)has relatively large biases in both the S-band and X-band,while the bias of R(ZH,ZDR)is rel-atively small in the S-band but increases significantly with increasing rainfall intensity in the X-band while R(KDP)has better performance in the X-band.R(KDP,ZDR)performs the best in both the S/X-band and is minimally affected by changes in raindrop size distribution,with little difference between the two stages.关键词
海葵/台风残涡/雨滴谱分布/双偏振参量/雷达定量降水估测Key words
Typhoon Haikui/typhoon residual vortex/raindrop size distribution/dual-polarization para-meter/radar quantitative precipitation estimation分类
天文与地球科学引用本文复制引用
吴若婷,杨思晓,黄楚贤,甘泉,王刚.."海葵"残涡的雨滴谱特征及其对S/X波段定量降水估测算法的影响[J].气象,2026,52(1):29-43,15.基金项目
广东省气象局科研项目(GRMC2023Q02)、惠州市科技计划项目(2021SC010303001)、惠州市气象局科技项目(2022Q01)和广州气象卫星地面站研究项目(2302)共同资助 （GRMC2023Q02）
