Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-18-0070.1 |
A Hypothesis for the Intensification of Tropical Cyclones under Moderate Vertical Wind Shear | |
Rios-Berrios, Rosimar1,2; Davis, Christopher A.2; Torn, Ryan D.1 | |
2018-12-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2018 |
卷号 | 75期号:12页码:4149-4173 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | A major open issue in tropical meteorology is how and why some tropical cyclones intensify under moderate vertical wind shear. This study tackles that issue by diagnosing physical processes of tropical cyclone intensification in a moderately sheared environment using a 20-member ensemble of idealized simulations. Consistent with previous studies, the ensemble shows that the onset of intensification largely depends on the timing of vortex tilt reduction and symmetrization of precipitation. A new contribution of this work is a process-based analysis following a shear-induced midtropospheric vortex with its associated precipitation. This analysis shows that tilt reduction and symmetrization precede intensification because those processes are associated with a substantial increase in near-surface vertical mass fluxes and equivalent potential temperature. A vorticity budget demonstrates that the increased near-surface vertical mass fluxes aid intensification via near-surface stretching of absolute vorticity and free-tropospheric tilting of horizontal vorticity. Importantly, tilt reduction happens because of a vortex merger processnot because of advective vortex alignmentthat yields a single closed circulation over a deep layer. Vortex merger only happens after the midtropospheric vortex reaches upshear left, where the flow configuration favors near-surface vortex stretching, deep updrafts, and a substantial reduction of low-entropy fluxes. These results lead to the hypothesis that intensification under moderate shear happens if and when a restructuring process is completed, after which a closed circulation favors persistent vorticity spinup and recirculating warm, moist air parcels. |
英文关键词 | Wind shear Precipitation Tropical cyclones Vorticity Cloud resolving models |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000450060500001 |
WOS关键词 | HURRICANE EDOUARD 2014 ; MIDLEVEL DRY AIR ; RAPID INTENSIFICATION ; PART I ; EXTRATROPICAL TRANSITION ; ENVIRONMENTAL HELICITY ; MULTISCALE STRUCTURE ; CONVECTIVE BURSTS ; ENSEMBLE APPROACH ; INTENSITY CHANGE |
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/29353 |
专题 | 地球科学 |
作者单位 | 1.SUNY Albany, Dept Atmospher & Environm Sci, Albany, NY 12222 USA; 2.Natl Ctr Atmospher Res, POB 3000, Boulder, CO 80307 USA |
推荐引用方式 GB/T 7714 | Rios-Berrios, Rosimar,Davis, Christopher A.,Torn, Ryan D.. A Hypothesis for the Intensification of Tropical Cyclones under Moderate Vertical Wind Shear[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(12):4149-4173. |
APA | Rios-Berrios, Rosimar,Davis, Christopher A.,&Torn, Ryan D..(2018).A Hypothesis for the Intensification of Tropical Cyclones under Moderate Vertical Wind Shear.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(12),4149-4173. |
MLA | Rios-Berrios, Rosimar,et al."A Hypothesis for the Intensification of Tropical Cyclones under Moderate Vertical Wind Shear".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.12(2018):4149-4173. |
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