陕西榆林一次大暴雨成因分析
|
摘要
利用常规气象观测资料、陕西区域自动站观测资料、NCEP 1°×1°再分析资料和卫星雷达探测资料,对2017年7月25—26日陕北榆林一次大暴雨进行了诊断分析,结果表明:本次过程以对流性强降水为主,在副热带高压控制下,300 hPa高空急流增强南压、河套地区弱的高空短波槽东移配合低层偏南风增大为本次大暴雨产生提供了有利的背景场。远距离台风外围偏南气流为强降水提供了充沛的水汽和能量,东路水汽输送进一步增强了大气整层可降水量。高层有值为0.2 PVU正值位涡扰动沿假相当位温密集区下滑,与低层东路冷空气共同加剧了大气的对流不稳定性,导致若干个中小尺度对流系统合并发展成一椭圆形MCS,MCS最强时段TBB≤52℃冷云罩面积达1.6×105 km~2,强降水区位于MCS合并处及中心附近。对流单体造成榆林市子洲县第一阶段强降水",列车效应"是造成子洲第二阶段强降水主要原因。
In this study,we analyzed a regional rainstorm of Yulin City,Shaanxi during 25 th-26 th July 2017 with the conventional data,regional automatic station data,NCEP 1°×1°reanalysis data and the observations of satellite and radar,the results show that: this weather process was dominated by convective heavy precipitation. Under the control of subtropical high,the 300 hPa jet stream was strengthened and moving southward. Meanwhile, the southerly airflow around the long-distance typhoon provides abundant water vapor and energy for heavy precipitation,and the water vapor transport along the east road further enhances the atmospheric precipitable water. The convective instability was enhanced by the decline of upper-level positive potential vorticity was about 0.2 PVU disturbance along the intensive areas of the potential pseudo-equivalent temperature and the low-level cold air from the east,which resulted in the merging of small mesoscale systems,and developed into the mesoscale system. In the mature stage,the area of cold cloud cover the area 6×105 km~2,and the TBB was less than -52℃. The heavy rainfall was located at the merging area and the center of mesoscale system. The first stage of the precipitation process in Zizhou County of Yulin was caused by convective monomer,furthermore,the second stage is caused by"Train Effect".
In this study,we analyzed a regional rainstorm of Yulin City,Shaanxi during 25 th-26 th July 2017 with the conventional data,regional automatic station data,NCEP 1°×1°reanalysis data and the observations of satellite and radar,the results show that: this weather process was dominated by convective heavy precipitation. Under the control of subtropical high,the 300 hPa jet stream was strengthened and moving southward. Meanwhile, the southerly airflow around the long-distance typhoon provides abundant water vapor and energy for heavy precipitation,and the water vapor transport along the east road further enhances the atmospheric precipitable water. The convective instability was enhanced by the decline of upper-level positive potential vorticity was about 0.2 PVU disturbance along the intensive areas of the potential pseudo-equivalent temperature and the low-level cold air from the east,which resulted in the merging of small mesoscale systems,and developed into the mesoscale system. In the mature stage,the area of cold cloud cover the area 6×105 km~2,and the TBB was less than -52℃. The heavy rainfall was located at the merging area and the center of mesoscale system. The first stage of the precipitation process in Zizhou County of Yulin was caused by convective monomer,furthermore,the second stage is caused by"Train Effect".
引文
[1]彭军,周雪英,赵威,等.新疆巴州“6·4”罕见大暴雨中尺度特征分析[J].沙漠与绿洲气象,2016,10(1):68-75.
[2]陶林科,杨侃,胡文东,等.“7·30”大暴雨的数值模拟及贺兰山地形影响分析[J].沙漠与绿洲气象,2014,8(4):32-39.
[3]张俊兰,魏荣庆,杨柳.2013年南疆两场罕见暴雨落区和强度的对比分析[J].沙漠与绿洲气象,2014,8(5):1-9.
[4]孟丽霞,许东蓓,狄潇泓,等.甘肃省短时强降水的时空特征[J].沙漠与绿洲气象,2017,11(6):34-39.
[5]白晓平,王式功,赵璐,等.西北地区东部短时强降水概念模型[J].高原气象,2016,35(5):1248—1256.
[6]韩宁,苗春生.近6年陕甘宁三省5-9月短时强降水特征统计[J].应用气象学报,2012,23(6):691—701.
[7]侯建忠,张弘,李明娟,等.台风活动对陕西重大洪灾事件影响的综合分析[J].气象,2010,36(9):94—99.
[8]李明,高维英,李萍云.陕西关中西北部一次短时强降水过程的成因分析[J].气象科学,2016,36(5):689—696.
[9]张雅斌,马晓华,薛谌彬,等.“0812”关中盛夏突发性暴雨中尺度特征分析[J].热带气象学报,2017,33(2):187—200.
[10]梁生俊,马晓华.西北地区东部两次典型大暴雨个例对比分析[J].气象,2012,38(7):804—813.
[11]崔强,王春明,张云.干侵入对江淮流域一次强飑线过程的作用分析[J].沙漠与绿洲气2016,10(2):18-24.
[12]张玉峰,张潜玉.2013年8月6—7日华北大暴雨过程的诊断分析[J].气象与环境科学,2015,38(3):114-119.
[13]陶诗言.中国之暴雨[M].北京:科学出版社,1980:176—177.
[14]丁一汇.陶诗言先生在中国暴雨发生条件和机制研究中的贡献[J].大气科学,2014,38(4):616—626.
[15]陕西省气象局.1977年7月4-6日延河流域大暴雨个例分析—材料之一[J].陕西气象,1978(5):1-24.
[16]陕西省气象局.77.7延河大暴雨的次天气尺度系统分析—材料之二[J].陕西气象,1978(5):25-34.
[17]王宁,王秀娟,张硕,等.吉林省一场持续性暴雨成因及MCC特征分析[J].气象,2016,42(7):809-818.
[18]俞小鼎,姚秀萍,熊廷南,等.多普勒天气雷达原理与业务分析[M].北京:气象出版社,2006:171.
[19]夏冠聪,寿绍文.一次梅雨锋暴雨的数值模拟及位涡诊断[J],南京气象学院学报,2007,30(4):538-545.
[20]吴国雄,蔡雅萍,唐晓菁.湿位涡和倾斜涡度发展[J],气象学报,1995,53(4):387-404.
[21]赵桂香,杜莉,卫丽萍,等.一次持续性区域雾霾天气的综合分析[J],干旱区研究,2011,28(5):871-878.
[2]陶林科,杨侃,胡文东,等.“7·30”大暴雨的数值模拟及贺兰山地形影响分析[J].沙漠与绿洲气象,2014,8(4):32-39.
[3]张俊兰,魏荣庆,杨柳.2013年南疆两场罕见暴雨落区和强度的对比分析[J].沙漠与绿洲气象,2014,8(5):1-9.
[4]孟丽霞,许东蓓,狄潇泓,等.甘肃省短时强降水的时空特征[J].沙漠与绿洲气象,2017,11(6):34-39.
[5]白晓平,王式功,赵璐,等.西北地区东部短时强降水概念模型[J].高原气象,2016,35(5):1248—1256.
[6]韩宁,苗春生.近6年陕甘宁三省5-9月短时强降水特征统计[J].应用气象学报,2012,23(6):691—701.
[7]侯建忠,张弘,李明娟,等.台风活动对陕西重大洪灾事件影响的综合分析[J].气象,2010,36(9):94—99.
[8]李明,高维英,李萍云.陕西关中西北部一次短时强降水过程的成因分析[J].气象科学,2016,36(5):689—696.
[9]张雅斌,马晓华,薛谌彬,等.“0812”关中盛夏突发性暴雨中尺度特征分析[J].热带气象学报,2017,33(2):187—200.
[10]梁生俊,马晓华.西北地区东部两次典型大暴雨个例对比分析[J].气象,2012,38(7):804—813.
[11]崔强,王春明,张云.干侵入对江淮流域一次强飑线过程的作用分析[J].沙漠与绿洲气2016,10(2):18-24.
[12]张玉峰,张潜玉.2013年8月6—7日华北大暴雨过程的诊断分析[J].气象与环境科学,2015,38(3):114-119.
[13]陶诗言.中国之暴雨[M].北京:科学出版社,1980:176—177.
[14]丁一汇.陶诗言先生在中国暴雨发生条件和机制研究中的贡献[J].大气科学,2014,38(4):616—626.
[15]陕西省气象局.1977年7月4-6日延河流域大暴雨个例分析—材料之一[J].陕西气象,1978(5):1-24.
[16]陕西省气象局.77.7延河大暴雨的次天气尺度系统分析—材料之二[J].陕西气象,1978(5):25-34.
[17]王宁,王秀娟,张硕,等.吉林省一场持续性暴雨成因及MCC特征分析[J].气象,2016,42(7):809-818.
[18]俞小鼎,姚秀萍,熊廷南,等.多普勒天气雷达原理与业务分析[M].北京:气象出版社,2006:171.
[19]夏冠聪,寿绍文.一次梅雨锋暴雨的数值模拟及位涡诊断[J],南京气象学院学报,2007,30(4):538-545.
[20]吴国雄,蔡雅萍,唐晓菁.湿位涡和倾斜涡度发展[J],气象学报,1995,53(4):387-404.
[21]赵桂香,杜莉,卫丽萍,等.一次持续性区域雾霾天气的综合分析[J],干旱区研究,2011,28(5):871-878.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |