台风“珍珠”(2006)螺旋雨带发展机制的数值模拟研究
投稿时间: 2017-03-01  最后修改时间: 2017-03-01  点此下载全文
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作者单位E-mail
王咏青 南京信息工程大学气象灾害教育部重点实验室太平洋台风研究中心 yongqing@ nuist.edu.cn 
蔡敏敏 南京信息工程大学气象灾害教育部重点实验室太平洋台风研究中心  
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:本文通过使用分辨率为2km 的ARW-WRF数值模拟资料,讨论了台风“珍珠”(2006)螺旋雨带中对流单体以及内雨带的发展机制。结果表明,模式很好地再现了台风的路径和强度。作为雨带中仅仅存在于眼壁外侧的内雨带,发现其传播机制和重力波, 涡旋Rossby波以及混合波都没有联系。可能仅仅和眼壁中产生的平流有关。同时,对于组成螺旋雨带中精细的对流单体的发展而言,通过对涡度收支方程的定量分析发现其主要通过两种方式获得垂直涡度: 通过水平涡度倾斜为垂直涡度;上升运动拉伸垂直涡度的。随着平流输送,对流单体会在眼壁附近合并和汇聚。
中文关键词:台风  数值模拟  螺旋雨带  发展机制
 
Propagation of Spiral Rainbands in a Numerical Simulation of Typhoon Chanchu (2006)
Abstract:In this study, propagation mechanism of convective cells in spiral rainbands and development of inner rainbands in super Typhoon Chanchu (2006) are examined using a Advanced Research Weather Research and Forecast (WRF-ARW) model simulation with the finest grid size of 2 km. Results show that the WRF model reproduces well the track and intensity. Development of inner rainbands, which is just outside the eyewall is not related with the gravity waves, the vortex Rossby waves or the mixed Rossby-Gravity Waves. It may be only associated with convection derived from the eyewall. In terms of the propagation mechanism of convective cells composing the spiral rainbands, They acquire their vertical vorticity through tilting of horizontal vorticity and stretching of vertical vorticity by quantitatively analyzing the vorticity budget equation. Convective cells in different spiral rainbands merges with each other because of the advection.
keywords:typhoon, numerical study, spiral rainbands, propagation mechanism
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