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作 者:贾旭轩 纪永明 段云霞[5] 刘晓初 梁军 JIA Xuxuan;JI Yongming;DUAN Yunxia;LIU Xiaochu;LIANG Jun(Institute of Atmospheric Environment,China Meteorological Administration,Shenyang 110166,China;State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences,Beijing 100081,China;Dalian Meteorological Observatory,Dalian 116001,China;Liaoning Meteorological Disaster Monitoring and Early Warning Centre,Shenyang 110166,China;Shenyang Meteorological Observatory,Shenyang 110168,China)
机构地区:[1]中国气象局沈阳大气环境研究所,辽宁沈阳110166 [2]中国气象科学研究院灾害天气国家重点实验室,北京100081 [3]大连市气象台,辽宁大连116001 [4]辽宁省气象灾害监测预警中心,辽宁沈阳110166 [5]沈阳市气象台,辽宁沈阳110168
出 处:《气象与环境学报》2024年第6期1-9,共9页Journal of Meteorology and Environment
基 金:中国气象局沈阳大气环境研究所联合开放基金课题(2021SYIAEKFMS01);灾害天气国家重点实验室开放课题(2024LASW-B14);环渤海区域科技创新基金(QYXM202108、QYXM202208);中国气象局创新发展专项(CXFZ2023J014)共同资助。
摘 要:选用大连市和丹东市SA多普勒天气雷达资料,结合地面观测和ERA5再分析资料,对比分析2020年9月11日(过程Ⅰ)和2021年9月10日(过程Ⅱ)辽东半岛两次微湿下击暴流天气过程的环流背景及成因。结果表明:两次过程均发生在东北冷涡背景下,过程Ⅰ为北上台风变性后的冷涡,过程Ⅱ为切断低压。两次过程的大气层结均为“上干下湿”的不稳定层结,探空曲线呈向上开口喇叭型,近地面温度垂直递减率接近干绝热,整层大气可降水量大于30 mm,抬升凝结高度较低,CAPE和DCAPE较小;0~6 km风切变强度为过程Ⅱ明显强于过程Ⅰ。两次过程的雷暴大风均由微湿下击暴流引发,过程Ⅰ为孤立风暴产生的微湿下击暴流,过程Ⅱ为飑线系统内嵌的微湿下击暴流。两次过程在微湿下击暴流发生前,多普勒天气雷达高仰角大于45 dBz的强反射率因子缺口均先于低仰角出现。The study utilizes SA Doppler weather radar data from Dalian and Dandong,combined with surface observations and ERA5 reanalysis data,to conduct a comparative analysis of the synoptic background and mechanisms of two mild-wet downburst events over the Liaodong Peninsula:the first on September 11,2020(Event I),and the second on September 10,2021(Event II).Results indicate that both events occur under the influence of a Northeast Cold Vortex.Event I is associated with a cold vertex transformed from a northward typhoon,while Event II involves a cut-off low.Both events are characterized by unstable atmospheric stratifications of"upper-wet and lower-dry",with skew-T diagrams showing an upward-opening"bell-shaped"structure.Near-surface temperature lapse rates are nearly dry-adiabatic.The precipitable water content exceeds 30 mm.The lifting condensation level is low,with CAPE and DCAPE values being relatively small.The 0-6 km wind shear intensity is significantly stronger in Event II than in Event I.The thunderstorm gale events in both cases are induced by wet microbursts,with Event I involving an isolated storm and Event II embedded within a squall line system.In both cases,the Doppler radar reflectivity notches exceeding 45 dBz appear earlier at higher elevation angles than at lower elevation angles prior to the wet microbursts.
分 类 号:P458.2[天文地球—大气科学及气象学]
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