Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-17-0077.1 |
Time and Space Scales in the Tropical Cyclone Boundary Layer, and the Location of the Eyewall Updraft | |
Kepert, Jeffrey D.1,2 | |
2017-10-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2017 |
卷号 | 74期号:10 |
文章类型 | Article |
语种 | 英语 |
国家 | Australia |
英文摘要 | The transient response of the tropical cyclone boundary layer is studied using linearized and nonlinear models, with particular focus on the frictionally forced vertical motion. The impulsively started, linearized tropical cyclone boundary layer is shown to adjust to its equilibrium solution via a series of decaying oscillations with the inertial period 2p/ I. In the nonlinear case, the oscillation period is slightly lengthened by inward advection of the slower-evolving flow from larger radii, but the oscillations decay more quickly. In an idealized cyclone with small sinusoidal oscillations superimposed on the gradient wind, the equilibrium nonlinear boundary layer acts as a low-pass filter with pass length scaling as 2u10/ I, where 2u10 is the 10-m frictional inflow. This filter is absent from the linearized boundary layer. The eyewall frictional updraft is similarly displaced inward of the radius of maximum winds (RMW) by a distance that scales with 2u10/ I, owing to nonlinear overshoot of the inflowing air as it crosses the relatively sharp increase in I near the eyewall. This displacement is smaller (other things being equal) when theRMWis small, and greater when it is large, including in secondary eyewalls. The dependence of this distance on 2u10/ I may explain, at least partially, why observedRMWare seldom less than 20 km, why storms with relatively peaked radial profiles of wind speed can intensify more rapidly, and why some secondary eyewalls initially contract rapidly with little intensification, then contract more slowly while intensifying. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000411637700010 |
WOS关键词 | PART I ; HURRICANE-ISABEL ; MODEL ; CORE ; DYNAMICS ; INTENSIFICATION ; SIMULATION ; CONVECTION ; VORTEX ; FLOWS |
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/29806 |
专题 | 地球科学 |
作者单位 | 1.Bur Meteorol, Res & Dev, Melbourne, Vic, Australia; 2.Bushfire & Nat Hazards Cooperat Res Ctr, Melbourne, Vic, Australia |
推荐引用方式 GB/T 7714 | Kepert, Jeffrey D.. Time and Space Scales in the Tropical Cyclone Boundary Layer, and the Location of the Eyewall Updraft[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2017,74(10). |
APA | Kepert, Jeffrey D..(2017).Time and Space Scales in the Tropical Cyclone Boundary Layer, and the Location of the Eyewall Updraft.JOURNAL OF THE ATMOSPHERIC SCIENCES,74(10). |
MLA | Kepert, Jeffrey D.."Time and Space Scales in the Tropical Cyclone Boundary Layer, and the Location of the Eyewall Updraft".JOURNAL OF THE ATMOSPHERIC SCIENCES 74.10(2017). |
条目包含的文件 | 条目无相关文件。 |
个性服务 |
推荐该条目 |
保存到收藏夹 |
查看访问统计 |
导出为Endnote文件 |
谷歌学术 |
谷歌学术中相似的文章 |
[Kepert, Jeffrey D.]的文章 |
百度学术 |
百度学术中相似的文章 |
[Kepert, Jeffrey D.]的文章 |
必应学术 |
必应学术中相似的文章 |
[Kepert, Jeffrey D.]的文章 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论