大气科学2025，Vol.49Issue(2)：406-418,13.DOI:10.3878/j.issn.1006-9895.2312.23095
基于多源资料的东北冷涡降水垂直结构分析
Analysis of the Vertical Structure of the Northeast China Cold Vortex Precipitation Based on Multisource Data
摘要
Abstract
Herein,to further study the vertical structure of the northeast cold vortex cloud system precipitation,the microphysical characteristics of three northeast China cold vortex precipitation events in Fuxin since 2020 are analyzed using a Micro rain radar(MRR)and laser disdrometer deployed at the national ground observation station of Fuxin Mongol Autonomous County,Liaoning Province.Results show that the raindrop size distributions(RSDs)measured by the MRR and disdrometer have high consistency in cases dominated by stable precipitation of stratus clouds and that the average RSDs only show high agreement in the medium particle size range(1-2.5 mm)in cases with a higher proportion of convective precipitation.During stratiform precipitation,the smaller ice crystal particles begin to melt faster through the 0℃layer,the small liquid droplets accumulate below the 0℃layer,and the extreme value of the droplet concentration appears.Conversely,the larger ice crystal particles experience a longer melting distance and become larger raindrops.Moreover,the accumulation of small liquid droplets below the 0℃layer further promotes the collection and collision of large droplets,which is conducive to the formation of larger raindrops.Furthermore,an extreme value of the width of RSD appears below the melting layer,manifesting as a"bulge"whose entire lifecycle,from the onset of its formation to decay,occurs within a 2-3 minute timeframe..Whether the broadening of RSD in the vertical direction can considerably increase rainfall intensity on the ground depends on the water vapor content in the near-surface atmosphere.In the dry spring of western Liaoning,the relative humidity of the atmosphere is low,and the existing of melting layer has no obvious help for broadening the ground RSD.However,in summer,when the water vapor is relatively abundant,the downward movement of the"bulge"to a certain extent leads to the widening of the near-ground RSD and an increase in rain intensity.Compared with the number concentration of rain droplets in other regions,that in western Liaoning is smaller.Still,the average concentrations of stratus and convective precipitation are not considerably different;moreover,the difference in mass-weighted diameter of rain droplets leads to a difference in rain intensity.关键词
东北冷涡/微雨雷达/雨滴谱垂直结构Key words
Northeast China cold vortex/Micro rain radar/Vertical structure of drop size distribution分类
大气科学引用本文复制引用
李遥,张铁凝,赵姝慧,孙丽,翟晴飞..基于多源资料的东北冷涡降水垂直结构分析[J].大气科学,2025,49(2):406-418,13.基金项目
中国气象局沈阳大气环境研究所联合开放基金课题 2022SYIAEKFZD03、2023SYIAEKFMS13,中国气象局云降水物理与人工影响天气重点开放实验室创新基金项目2023CPML-B04,中国气象局创新发展专项CXFZ2022J059 Funded by China Meteorological Administration Shenyang Institute of Atmospheric Environment Joint Open Fund Project(Grants 2022SYIAEKFZD03,2023SYIAEKFMS13),Innovation Foundation of Key Laboratory of Cloud-Precipitation Physics and Weather Modification(CPML),China Meteorological Administration(Grant 2023CPML-B04),China Meteorological Administration Innovation and Development Project(Grant CXFZ2022J059) （Grants 2022SYIAEKFZD03,2023SYIAEKFMS13）
