收稿日期: 2010-11-15
修回日期: 2011-07-22
网络出版日期: 2012-10-24
基金资助
国家自然科学基金项目(40765002); 公益性行业(气象)科研专项(GYHY200906002); 海南省自然科学基金项目(0807073)
Simulation on evolution of the inner-core structure of typhoon Damrey over Hainan Island
Received date: 2010-11-15
Revised date: 2011-07-22
Online published: 2012-10-24
利用非静力中尺度数值模式WRF (V2.2)对0518号台风“达维”(Damrey)经过海南岛过程进行了模拟。模式较好地再现了“达维”经过岛屿过程的移动路径、强度变化、环流结构以及降水分布。基于模拟结果, 分析了台风内核区的动、热力场演变特征, 结果如下:1)经过岛屿期间, 台风内核区高、低层切向风速变化不大, 贴地层与中间层切向风速在登陆过程及岛上移动前期减小, 岛上移动后期到离岛入海期间增大。2)台风内核区高、低层分别存在主体出流及回流入流、主体入流及回流出流。登陆过程及岛上移动前期, 主体入流速度变化不大, 主体出流明显减弱。岛上移动后期到离岛入海期间, 主体出流与回流出流明显加大并出现合并趋势。3)经过岛屿期间, 台风环流区的环境风垂直切变没有像大多数热带气旋登陆一样出现增大的趋势, 反而减小。切变下风方向先顺转后逆转, 切变下风方向左侧与降水区有较好对应。4)登陆过程及岛上移动前期, 台风高、低层的垂直速度及凝结加热均显著减小; 岛上移动后期, 高层垂直运动及凝结潜热释放继续减小, 低层则明显增大。
许向春 , 于玉斌 , 王式功 , 李勋 , 田光辉 . 台风“达维”经过海南岛过程内核结构演变的数值分析*[J]. 热带海洋学报, 2012 , 31(4) : 66 -74 . DOI: 10.11978/j.issn.1009-5470.2012.04.009
Using the non-hydrostatic model WRF V2.2, Typhoon Damrey (0518) that moved over Hainan Island is simulated. The results show well simulated track, intensity, circulation and precipitation characteristics of the typhoon. Based on the model output, the dynamic and thermodynamic characteristics of its inner-core area are analyzed. The results are as follows. 1) When Damrey moved over Hainan Island, the inner-core tangential wind speed changed little in the lower and upper levels. The speed decreased near the surface and middle levels during its landfall and the earlier stage when it passed the island. And the speed increased during the later stage while passing the island and its movement off the island and into the sea. 2) There existed main outflow, return inflow, main inflow and return outflow in the lower and upper troposphere. During the landfall and the earlier stage as a topical cyclone (TC) that passed the island, velocity of the main inflow varied little while the main outflow decreased remarkably. During the later stage of the TC that passed the island and its movement off the island and into the sea, the main outflow and return outflow significantly increased and exhibited a merging trend. 3) When it moved over Hainan Island, the vertical wind shear decreased instead of increasing over the typhoon circulation that usually occurs in the TC that moves from sea to land. The downshear direction shifted clockwise first, and then counter-clockwise. The precipitation area coincided well with the downshear’s left-hand side. 4) During the landfall and the earlier stage of the TC that passed the island, the vertical velocity and condensational heat decreased significantly in the lower and upper troposphere. During the later stage of the TC that passed the island, it continued to decrease in the upper troposphere but increase largely in the lower troposphere.
Key words： Typhoon Damrey; landfall; Hainan Island; inner-core; structure evolution
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