气象2024，Vol.50Issue(8)：929-940,12.DOI:10.7519/j.issn.1000-0526.2023.071002
多源观测资料在六盘山西侧一次强对流暴雨中的应用
Application of Muti-Source Observation Data in a Severe Convective Rainstorm on the West Side of Liupan Mountains
摘要
Abstract
The severe convective rainstorm that occurred on the west side of Liupan Mountains on 15 July 2022,which is missed by both the numerical weather prediction models and the subjective forecast of fore-casters,is analyzed based on the data from regional weather stations,X-band dual-polarization weather radar,C-band Doppler weather radar,wind profiler radar,and the ERA5 hourly reanalysis and conventional ob-servation data.The results show that the rainstorm occurred in the northwest side of the western Pacific subtropical high.The main area of severe rainfall was the south side of the low-level shear line and the left-front side of the low-level jet.Affected by the terrain of Liupan Mountains,the mesoscale ground conver-gence line,mesoscale low-level southwest jet and mesoscale vortex might be important systems of trigge-ring,maintaining and enhancing of the process.The rainstorm was caused by two mesoscale echo bands,on which the convective cells propagated backward,forming obvious train effect.The strengthening low-level jet,the increasing vertical wind shear,the downward disturbance of wind speed in the jet,and the dry intrusion appeared 1-2 h ahead of the increase in 5 min precipitation,which has a certain reference value for rainstorm forecast and early warning.The center of severe rainfall has a better corresponding re-lationship with the echo area with intensity ≥50 dBz and the large value area of vertical integrated liquid water,the echo tops,the large ranges of differential phase shift(KDP)and differential reflectivity(ZDR).KDP is a good indicator for intensity of severe rainfall.The maximum values of KDP and ZDR appeared 10 min earlier than the maximum rainfall in five minutes.The ZDR arc and ZDR column also appear 10-20 min earlier than the maximum rainfall.During the heaviest rainfall period,the KDP was 3.0-4.0 °·km-1,the ZDR was 3.0-3.3 dB,and the correlation coefficient was 0.90-0.95,which suggests that the spectrum of rain particulates contained a large amount of relatively large-sized raindrops,increasing the ex-tremity of precipitation.关键词
对流性暴雨/低空急流/中尺度地面辐合线/X波段双偏振雷达/风廓线雷达Key words
convective rainstorm/low-level jet/mesoscale ground convergence line/X-band dual-polariza-tion weather radar/wind profiler radar分类
天文与地球科学引用本文复制引用
张晓茹,苏洋,丁永红,薛宏宇,贾乐,孙艳桥..多源观测资料在六盘山西侧一次强对流暴雨中的应用[J].气象,2024,50(8):929-940,12.基金项目
宁夏回族自治区第五批青年科技人才托举工程项目(NXKJTJGC2021089)、中国气象局2023年复盘总结专项(FPZJ2023-147)、宁夏回族自治区重点研发计划项目(2022BBF02014)和宁夏自然科学基金项目(2022AAC03670、2023A0897)共同资助 （NXKJTJGC2021089）
