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| 一次台风远距离暴雨中的干侵入分析 | |
| 引用本文： | 李媛,赵宇,李婷,李敏,侯红运.一次台风远距离暴雨中的干侵入分析[J].气象科学,2014,34(5):536-542. |
| 作者姓名： | 李媛 赵宇 李婷 李敏 侯红运 |
| 作者单位： | 1. 南京信息工程大学大气科学学院,南京210044;济宁市气象局,山东济宁272000 2. 南京信息工程大学大气科学学院,南京,210044 3. 南京信息工程大学大气科学学院,南京210044;宁夏回族自治区气象台,银川750002 4. 济宁市气象局,山东济宁,272000 |
| 基金项目： | 南京信息工程大学科研基金项目（20100314）；水利部公益性行业科研专项经费资助项目（201201063）；国家自然科学基金项目（41075069；41175056）；江苏高校优势学科建设工程资助项目（PAPD） |
| 摘 要： | 利用常规观测资料和NCEP再分析资料,对2008年7月17—19日发生在山东地区的台风远距离暴雨过程进行了观测分析和模拟研究。结果表明:降水期间有来自中高层的干冷空气的侵入,主要有两种表现形式:对流层顶附近向下的干空气侵入和对流层低层由西北向南的干空气侵入。干侵入存在于300~600 hPa之间,高层略微落后于低层,不利于对流不稳定的发展。但干冷空气侵入使得等相当位温面倾斜,有利于条件性对称不稳定的发展。干侵入使原来不饱和湿空气出现饱和,有利于降水增幅,雨区始终位于500 hPa干区前沿。高层正位涡扰动沿相当位温密集带向低层输送,500 hPa位涡高值区与降水有较好的同位相关系,对降水的发展和移动有一定的指示意义。 |
| 关 键 词： | 台风 干空气侵入 位涡 湿对称不稳定 |
| 收稿时间： | 2013/2/20 0:00:00 |
| 修稿时间： | 2013/7/13 0:00:00 |
Analysis on dry intrusion of a remote typhoon rain |
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| LI Yuan,ZHAO Yu,LI Ting,LI Min and HOU Hongyun.Analysis on dry intrusion of a remote typhoon rain[J].Scientia Meteorologica Sinica,2014,34(5):536-542. | |
| Authors: | LI Yuan ZHAO Yu LI Ting LI Min and HOU Hongyun |
| Institution: | College of Atmospheric Sciences, Nanjing University of Information Science & Technology. Nanjing 210044, China;Jining Meteorological Bureau, Shandong Jining 272000, China;College of Atmospheric Sciences, Nanjing University of Information Science & Technology. Nanjing 210044, China;College of Atmospheric Sciences, Nanjing University of Information Science & Technology. Nanjing 210044, China;Ningxia Meteorological Observatory, Yinchuan 750002, China;Jining Meteorological Bureau, Shandong Jining 272000, China;Jining Meteorological Bureau, Shandong Jining 272000, China |
| Abstract: | By using routine observation and NCEP reanalysis data, a typhoon remote heavy rainfall in Shandong province during 17-19 July, 2008 was diagnostically analyzed and simulated. The results show that the dry cold air intrusion process from mid-high level happened in this rainfall process can be classified into two forms: one is the dry intrusion from the top of troposphere while the other is from the lower layer of troposphere in the direction of northwest-north. The dry intrusion was located between 300-600 hPa,and the upper levels are slightly behind the low ones, it was not good for the unstable development of convection. The unsaturated moist air turns to be saturated because of the dry intrusion, which led to the precipitation increasing, and the rain area was always located in the forefront of 500 hPa dry area. The disturbance of positive potential vorticity in the upper troposphere transporting downwards to the lower level along the intensive band of pseudo-equivalent potential temperature stimulated the development of the low-level mesoscale vortex. The in-phase relation between large-value potential vorticity at 500 hPa and precipitation implies the development and movement of the precipitation. |
| Keywords: | Typhoon Dry air intrusion Potential vorticity Conditional symmetric instability |
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