内核及外围尺度对热带气旋强度影响的数值试验

吴联要; 雷小途; 汤杰

内核及外围尺度对热带气旋强度影响的数值试验

1.
浙江省气象台, 浙江杭州 310017
2.
中国气象局上海台风研究所, 上海 200030

基金项目: 国家重点基础研究发展计划(973计划)项目(2013CB430300,2015CB452800);公益性行业(气象)科研专项经费项目(GYHY201406010);浙江省气象科技计划项目(2014ZD03-1,2013ZD03)。

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出版历程
- 收稿日期: 2014-08-20
- 修回日期: 2015-06-05

Numerical simulation on how the inner core and outer size of tropical cyclones influence the intensity

1.
Zhejiang Meteorological Observatory, Hangzhou 310017, China
2.
Shanghai Typhoon Institute Of China Meteorological Administration, Shanghai 200030, China

摘要

摘要: 采用WRF数值模式模拟并对热带气旋尺度与强度关系进行了探讨,且初步诊断分析了内核及外围尺度对热带气旋强度影响的可能机制,结果表明:(1)内核区较大时的缩放引起角速度变化是其影响热带气旋强度的机制之一;(2)内核区较小时的进一步收缩引起的眼区次级环流破坏是其影响热带气旋强度的一种机制;(3)外围尺度变化造成低层上升至高层的水汽总量变化,是其影响热带气旋强度的一种机制;另一方面,外围尺度发生变化使得低层气流向热带气旋内的辐合减少,亦是其影响热带气旋强度的机制之一。
- 热带气旋 /
- 尺度 /
- 强度 /
- 数值试验
Abstract: Via WRF numerical simulation experiments,this paper discusses the relationship between tropical cyclone(TC) size and intensity,and diagnose the possible mechanism of how TC inner core and outer size influence TC intensity. Results show that: (1) while TC has large inner core,the balance of angular momentum explains that why changing of inner core will course TC intensifying or weakening. (2) While TC has small inner core,the reason why zoom out(zoom in)of inner core leads to TC weakening (intensifying) might be the damage of secondary circulation. (3) the changing of humidity supply and convergence area in low level may be the mechanism for that outer size increment(decrease) helps TC intensifying(weakening).
- tropical cyclone /
- size /
- intensity /
- numerical simulation

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参考文献(12)

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