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DOI | 10.1175/JAS-D-18-0042.1 |
A Dynamical Mechanism for Secondary Eyewall Formation in Tropical Cyclones | |
Miyamoto, Yoshiaki1,2,4; Nolan, David S.1; Sugimoto, Norihiko3 | |
2018-11-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2018 |
卷号 | 75期号:11页码:3965-3986 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Japan |
英文摘要 | This study proposes that secondary eyewall formation (SEF) of tropical cyclones (TCs) can be attributed to an instability of flow in the free atmosphere coupled with Ekman pumping. Unstable solutions of a 1.5-layer shallow-water system are obtained under fast-wind speed conditions in the free atmosphere. The instability condition derived in the linear model indicates the importance of the ratio of angular velocity to vorticity, and the condition is more likely to be satisfied when the ratio is large and its radial gradient is positive. Thus, fast angular velocity, low absolute vertical vorticity, small negative radial gradient of angular velocity, and large negative gradient of vertical vorticity are favorable. Eigenvalue analyses are performed over a wide range of parameters using a vorticity profile with an infinitesimal secondary maximum. The growth rate increases with vorticity outside the radius of maximum wind (RMW), the radius of the secondary vorticity maximum, its magnitude, and the Rossby number defined bymaximumtangential velocity, the RMW, and the Coriolis parameter. Further more, the growth rate is positive only between 2 and 7 times the RMW, and it is negative close to or far outside the RMW. These features are consistent with previous studies on SEF. A dimensionless quantity gamma obtained from the unstable condition in the linear theory is applied to SEF events simulated by two different full-physics numerical models; gamma increases several hours before a secondary peak of tangential velocity forms, suggesting that the initial process of SEF can be attributed to the proposed mechanism. |
英文关键词 | Ekman pumping transport Hurricanes Ekman pumping Hurricanes typhoons Tropical cyclones Hurricanes typhoons |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000448364800003 |
WOS关键词 | HURRICANE INTENSITY ; BOUNDARY-LAYER ; WIND-FIELD ; PART II ; EVOLUTION ; VORTEX ; SIMULATION ; STABILITY ; CYCLE ; JET |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/29537 |
专题 | 地球科学 |
作者单位 | 1.Univ Miami, Rosenstiel Sch Marine & Atmospher Sci, 4600 Rickenbacker Causeway, Miami, FL 33149 USA; 2.RIKEN, Adv Inst Computat Sci, Kobe, Hyogo, Japan; 3.Keio Univ, Dept Phys, Fujisawa, Kanagawa, Japan; 4.Keio Univ, Fac Environm & Informat Studies, Fujisawa, Kanagawa, Japan |
推荐引用方式 GB/T 7714 | Miyamoto, Yoshiaki,Nolan, David S.,Sugimoto, Norihiko. A Dynamical Mechanism for Secondary Eyewall Formation in Tropical Cyclones[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(11):3965-3986. |
APA | Miyamoto, Yoshiaki,Nolan, David S.,&Sugimoto, Norihiko.(2018).A Dynamical Mechanism for Secondary Eyewall Formation in Tropical Cyclones.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(11),3965-3986. |
MLA | Miyamoto, Yoshiaki,et al."A Dynamical Mechanism for Secondary Eyewall Formation in Tropical Cyclones".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.11(2018):3965-3986. |
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