| 2017年“海棠”台风影响辽宁不同区域极端暴雨成因分析 |
| |
| 引用本文： | 杨磊,孙丽,王东东,陈传雷,王瀛,才奎志,张岳.2017年“海棠”台风影响辽宁不同区域极端暴雨成因分析[J].气象与环境学报,2020,36(1):1-10. |
| |
| 作者姓名： | 杨磊 孙丽 王东东 陈传雷 王瀛 才奎志 张岳 |
| |
| 作者单位： | 1. 辽宁省气象灾害监测预警中心, 辽宁 沈阳 1101662. 辽宁省人工影响天气办公室, 辽宁 沈阳 1101663. 中国气象局沈阳大气环境研究所, 辽宁 沈阳 1101664. 中国气象局科技与气候变化司, 北京 100081 |
| |
| 基金项目： | 中国气象局预报员专项(CMAYBY2017-015、CMAYBY2018-016);气象预报业务关键技术发展专项(YBGJXM2019-01-05);辽宁省自然科学基金项目(20180540086、20180540093、20180551130);气象关键技术集成与应用项目(CMAGJ2015M15);2015年辽宁省气象局强对流创新团队项目;辽宁省气象局气象科研项目(201508、201611、201901);国家自然科学基金(41705127)共同资助 |
| |
| 摘 要： | 利用常规观测、NCEP FNL、葵花8号卫星、GNSS反演大气可降水量、智能网格实况产品等资料，分析2017年“海棠”台风造成辽宁西部朝阳地区和东南部岫岩县的极端暴雨成因。结果表明：辽宁西部和东南半岛均出现区域性的极端特大暴雨，岫岩县小时雨强更大，最大雨强达到113 mm·h-1，对流性降水特征明显。两个区域暴雨过程均受到热带、副热带、西风带系统共同作用，狭长型“海棠”台风沿着副热带高压西侧逐渐北上，并且与西风带短波槽相互作用，导致辽宁西部出现强降水，随后加强的涡旋系统后侧干冷空气与低空暖湿水汽输送带相互作用，导致岫岩县出现极端暴雨过程。热带台风“奥鹿”对副热带高压南落东退起到阻挡作用。两个区域均具有来自于南海的水汽通道，另外东南半岛也受到了“奥鹿”台风北侧水汽输送的影响。朝阳市和岫岩县大气可降水量值长时间接近65 mm和70 mm，异常指数最高达到3.0和2.5，表明此次暴雨水汽条件的极端性。辽宁西部降水期间动力不稳定更强，辐合层由地面伸展到500 hPa，而东南半岛降水期间上干下湿的水汽分布以及更强的冷暖空气交汇，有利于产生对流性降水。两个区域均受到多个中尺度云团的共同影响，朝阳地区初期降水由中γ尺度辐合线触发，后期台风在北上过程中与高空槽后部的干冷空气相互作用，形成的暖锋云系以及冷锋云系导致朝阳地区出现持续性强降水；加强的涡旋后部干空气侵入到暖湿水汽输送带中，配合岫岩县山区地面辐合线稳定不动，不断有积云触发并且直接影响岫岩县，导致岫岩县产生极端对流性暴雨。
|
| 关 键 词： | 台风 极端暴雨 葵花8号 水汽图像 大气可降水量 |
| 收稿时间： | 2018-12-02 |
Formation of an extreme rainstorm in different regions of Liaoning province affected by typhoon "Haitang" in 2017 |
| |
| YANG Leil,SUN Li,WANG Dong-dong,CHEN Chuan-leil,WANG Ying,CAI Kui-zhil,ZHANG Yue.Formation of an extreme rainstorm in different regions of Liaoning province affected by typhoon "Haitang" in 2017[J].Journal of Meteorology and Environment,2020,36(1):1-10. |
| |
| Authors: | YANG Leil SUN Li WANG Dong-dong CHEN Chuan-leil WANG Ying CAI Kui-zhil ZHANG Yue |
| |
| Institution: | 1. Liaoning Meteorological Disaster Monitoring and Early Warning Centre, Shenyang 110166, China2. Liaoning Weather Modification Office, Shenyang 110166, China3. Institute of Atmospheric Environment, China Meteorological Administration, Shenyang 110166, China4. Science and Technology&Climate Change Department, China Meteorological Administration, Beijing 100081, China |
| |
| Abstract: | We analyzed the formation of an extreme rainstorm event over the Chaoyang area in the western region of Liaoning province and the Xiuyan County in the Southeastern Peninsula,caused by the typhoon"Haitang"in2017,mainly using the conventional observation data,Final(FNL)reanalysis data from National Center of Environment Prediction(NCEP),Himawari-8 satellite data,Precipitable Water Vapor(PWV)retrieved from Global Navigation Satellite Systems(GNSS),and real-time products in smart grids.The results indicated that regional extreme heavy rainstorms occur in both of the western regions of Liaoning province and the Southeastern Peninsula.The Xiuyan County has larger hourly precipitation,with the maximum precipitation reaching 113 mm per hour,which shows obvious characteristics of convective precipitation.The rainstorm processes in both regions are influenced by systems from the tropical and subtropical zones and the westerlies.Typhoon"Haitang",showing a long and narrow shape,gradually moves northward along the western side of the Subtropical High,and interacts with a short wave trough of the westerlies,which results in the heavy precipitation in the western region of Liaoning province.Subsequently,dry cold air behind the strengthened vortex system interacts with warm and moist air in the low altitudes,leading to the extreme rainstorm event in Xiuyan County.Tropical typhoon"Aolu"blocks the retreat of the Subtropical High.Both regions have water vapor channels from the South China Sea,and the Southeastern Peninsula is also affected by the water vapor transport from the northern side of Typhoon"Aolu".The PWV in Chaoyang and Xiuyan almost reaches 65 mm and 70 mm in a long time period,respectively,and the maximum anomaly index is approximately 3.0 and 2.5,indicating the extreme condition for water vapor loading in the atmosphere during this rainstorm process.The dynamic instability is stronger in the western region of Liaoning province during the precipitation period.The convergence layer extends from the ground up to 500 hPa.The"upper dry and lower wet"distribution of water vapor in the Southeastern Peninsula and the stronger convergence of cold and warm air are more favorable to forming the convective precipitation.Multi-mesoscale clouds also affect the precipitation processes in both regions.The precipitation in Chaoyang County is caused by cumulus triggered by a meso-γ-scale convergence line during the early period,thereafter,the continuous heavy precipitation is related to the cold-front cloud system and the warm-front cloud system that is due to the interaction between the northward-moving typhoon and dry,cold air behind an upper trough.The intruding of dry air in the rear of the strengthened vortex into the transport belt of warm and wet water vapor is combined with a stable convergence line over the Xiuyan mountain area,which makes cumulus trigger continuously and directly affect the Xiuyan County and results in the extreme convective rainstorm in this region. |
| |
| Keywords: | Typhoon Extreme heavy rainstorm Himawari-8 satellite Water vapor imagery Precipitable water vapor(PWV) |
| 本文献已被 维普 万方数据 等数据库收录！ |
| 点击此处可从《气象与环境学报》浏览原始摘要信息 |
| 点击此处可从《气象与环境学报》下载免费的PDF全文 |
|
