热带气旋西行造成的远距离降雨特征分析
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摘要
2018年7月27～28日凉山州地区出现了持续性的强降水天气过程,本文运用水平分辨率为1°×1°的NECP6小时再分析资料、新型监测资料及常规观测资料进行分析。发现此次过程不同于常规的降水过程,环流背景上受副高外围的东南气流和热带气旋形成的东风波倒槽共同作用形成的急流轴影响,为降水地提供充足的水汽和能量补充,从而形势上形成了热带气旋远距离降水,同时副热带高压的稳定维持也阻挡了高原上的低值系统快速东移,使得降水机制长时间停滞,对降水地造成影响。
Continuous heavy rainfall occurred in Liangshan from July 27 to 28, 2018. In this paper, the NECP 6-hour reanalysis data, new monitoring data and conventional observation data with horizontal resolution of 1°×1° are used for analysis. It is found that this process is different from the conventional precipitation process. The circulation background is influenced by the jet axis formed by the southeast airflow around the subtropical high and the easterly wind wave inverted trough formed by the tropical cyclone, which provides sufficient water vapor and energy for the precipitation area, thus forming the long-distance precipitation of the tropical cyclone and the subtropical high. Pressure stability also prevents the low-value system from moving eastward rapidly, which makes the precipitation mechanism stagnate for a long time and affects the precipitation land.
Continuous heavy rainfall occurred in Liangshan from July 27 to 28, 2018. In this paper, the NECP 6-hour reanalysis data, new monitoring data and conventional observation data with horizontal resolution of 1°×1° are used for analysis. It is found that this process is different from the conventional precipitation process. The circulation background is influenced by the jet axis formed by the southeast airflow around the subtropical high and the easterly wind wave inverted trough formed by the tropical cyclone, which provides sufficient water vapor and energy for the precipitation area, thus forming the long-distance precipitation of the tropical cyclone and the subtropical high. Pressure stability also prevents the low-value system from moving eastward rapidly, which makes the precipitation mechanism stagnate for a long time and affects the precipitation land.
引文
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[10] 刘武,李耀东,史小康.FY-2G地表温度反演产品改变模式初值对一次台风暴雨模拟的影响[J].气象与环境科学,2017,40(1):26-34
[11] 章国材.强对流天气分析与预报[M].北京:气象出版社,2011:58-75
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[13] 孙继松,戴建华,何立富,等.强对流天气预报的基本原理与技术方法[M].北京:气象出版社,2014:22-58
[14] 张杰.中小尺度天气学[M].北京:气象出版社,2006:53-78
[2] 许爱华,孙继松,许东蓓,等.中国中东部强对流天气的天气形势分类和基本要素配置特征[J].气象,2014,40(4):400-411
[3] 李洪权,陈中,范广州.远距离台风外围偏东气流中的降雨成因分析[A]//中国气象学会台风委员会、中国气象局上海台风研究所.第26届中国气象学会年会热带气旋科学研讨会分会场论文集[C].2009:8
[4] 丁治英,赵晓慧,邢蕊,等.2000—2009年夏季东亚热带气旋远距离暴雨统计分析及个例的数值模拟[J].热带气象学报,2014,30(2):229-238
[5] 李媛,张泽铭,高广强,等.台风环流对远距离暴雨水汽输送影响研究[J].海洋气象学报,2017,37(1):111-117
[6] 魏晓雯,梁萍,何金海.上海地区不同类型短时强降水的大尺度环流背景特征分析[J].气象与环境科学,2016,39(2):69-75
[7] 张雅斌,武麦凤,侯建忠,等.陕西4次台风远距离暴雨过程的水汽条件对比[J].干旱气象,2014,32(5):788-797
[8] 陈联寿,许映龙.中国台风特大暴雨综述[J].气象与环境科学,2017,40(1):3-10
[9] 郭大梅,方建刚,侯建忠.陕西一次远距离台风暴雨天气分析[J].干旱气象,2013,31(1):138-143
[10] 刘武,李耀东,史小康.FY-2G地表温度反演产品改变模式初值对一次台风暴雨模拟的影响[J].气象与环境科学,2017,40(1):26-34
[11] 章国材.强对流天气分析与预报[M].北京:气象出版社,2011:58-75
[12] 姚学祥.天气预报技术与方法[M].北京:气象出版社,2011:286-311
[13] 孙继松,戴建华,何立富,等.强对流天气预报的基本原理与技术方法[M].北京:气象出版社,2014:22-58
[14] 张杰.中小尺度天气学[M].北京:气象出版社,2006:53-78
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