中昆仑山北坡持续性暴雨的水汽输送及其大气三维结构特征

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万方数据
维普

中文摘要：利用基于拉格朗日方法的 HYSPLIT_4轨迹模式,结合地基 GPS-MET观测资料,对 2019年 6月24～26日中昆仑山北坡一次持续性暴雨天气大尺度水汽输送特征及水汽源地进行分析,阐明了干旱区强降水期间大尺度环流异常与水汽持续接力输送过程的关系.结果表明:(1)降水前副热带高压(简称副高)位置异常偏西,副高外围偏南气流造成高原增湿明显.强降水期间,副高继续向西北伸展,低纬度水汽沿印度夏季风环流向北输送,经青藏高原接力输送至暴雨区,与塔什干低涡前偏南气流共同构成了中昆仑山北坡持续性强降水的水汽输送通道,水汽持续接力输送造成暴雨区可降水量(PWV)出现两次急剧增湿过程,测站PWV峰值达到气候平均值近 2倍.(2)300 hPa温度异常对于本次中昆仑山北坡持续性大暴雨天气水汽输送具有重要的作用.降水前和降水期间,300 hPa暖异常中心激发 200 hPa反气旋式环流异常和经向风正异常中心,同时,在暖异常中心南侧(印度半岛北部)和西侧,激发 500 hPa反气旋式环流异常中心和气旋式环流异常中心,反气旋式环流后部经向风正异常中心将低纬度地区暖湿气流向北输送,与气旋式环流东部偏南气流在暴雨区汇合,为持续性暴雨的发生提供充沛的水汽供应.

外文标题：Characteristic of Water Vapor Transportation and Three-Dimensional Atmospheric Structure during a Persistent Heavy Rain Event in the Northern Slope of the Middle Kunlun Mountains

外文摘要：Combining ground-based GPS-MET observation data with the HYSPLIT_4 trajectory model based on the Lagrange method,this study analyzed the large-scale water vapor transport characteristics and sources during a persistent heavy rainstorm event on the northern slope of the middle Kunlun Mountains.The relation between the large-scale circulation anomaly and water vapor continuous relay transport during heavy rainfall in arid areas was clarified.The results showed that:(1)Before precipitation,the subtropical high was abnormally westward,and the southward airflow on the periphery of the subtropical high caused obvious humidification over the Tibet Plateau.During the heavy rainfall,the subtropical high extended northwest,and water vapor from low latitude was conveyed to heavy rainfall areas along the Indian summer monsoon circulation and Tibet Plateau.This water vapor converged with the southern airflow in front of the Tashkent low vortex,which constituted the water vapor transport channel for this heavy rainstorm.This mechanism resulted in two rapid humidification events over the heavy rainstorm station.The peak precipitable water vapor levels of the station were nearly two times the climatic average.(2)Temperature anomalies at 300 hPa played an important role in the water vapor transport during the heavy rainstorm.Before and during the event,the 300-hPa warm anomaly center excited the 200-hPa anticyclonic circulation anomaly center and meridional wind positive anomaly center.Meanwhile,the 500-hPa anticyclonic circulation anomaly center and cyclonic circulation anomaly center were excited in the south and west of the warm anomaly center(north of the Indian Peninsula).At the back of anticyclonic circulation at 500 hPa,warm and wet air was transported northward along the positive windward anomaly center at low altitudes.This air then converged with southern airflows from the east of cyclonic circulation in the rainstorm area,providing an abundant water vapor supply for persistent rainstorms.

外文关键词：

Northern slope of the middle Kunlun MountainsPersistent precipitationWater vapor transportAtmospheric circulation anomaly

作者：

刘晶、周雅蔓、李建刚、曾勇、仝泽鹏、江雨霏、杨莲梅、周玉淑

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作者单位：

中国气象局乌鲁木齐沙漠气象研究所,乌鲁木齐 830002

新疆云降水物理与云水资源开发实验室,乌鲁木齐 830002

西天山云降水物理野外科学观测基地,乌鲁木齐 830002

新疆气象台,乌鲁木齐 830002

中国科学院大气物理研究所云降水物理与强风暴实验室,北京 100029

中国科学院大学地球科学学院,北京 100049

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关键词：

中昆仑山北坡持续性暴雨水汽输送大气环流异常

基金：

新疆维吾尔自治区自然科学基金项目新疆维吾尔自治区自然科学基金项目新疆气象局引导性项目天山英才培养计划项目新疆维吾尔自治区重点研发任务专项项目

项目编号：

2023D01B062022D01D86YD20230012022TSYCLJ00032023B03019-1

出版年：

2024

DOI：

10.3878/j.issn.1006-9895.2212.22097

大气科学

中国科学院大气物理研究所

大气科学

CSTPCD北大核心

影响因子：2.11

ISSN：1006-9895

年,卷(期)：2024.48(5)