DOI: 10.1002/jgrd.50830
论文题名: Synoptic and dynamical analysis of subtropical cyclone Anita (2010) and its potential for tropical transition over the South Atlantic Ocean
作者: Dias Pinto J.R. ; Reboita M.S. ; Da Rocha R.P.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 19 起始页码: 10870
结束页码: 10883
语种: 英语
英文关键词: energetics
; South Atlantic Ocean
; subtropical cyclones
; tropical transitions
; turbulent fluxes
Scopus关键词: Heat flux
; Hurricanes
; Oceanography
; Storms
; energetics
; South Atlantic
; Subtropical cyclones
; Tropical transition
; Turbulent flux
; Tropics
; disturbance
; energy efficiency
; environmental conditions
; flux measurement
; heat flux
; hurricane event
; subtropical region
; tropical cyclone
; turbulence
; Atlantic Ocean
; Atlantic Ocean (South)
英文摘要: Subtropical cyclogenesis and tropical transitions (TT) over the South Atlantic Ocean only received attention after the first documented Hurricane Catarina occurred close to the southern Brazilian coast in March 2004. However, due to the lack of studies in this part of the Atlantic Ocean, it is still unclear what the main environmental conditions and dynamical processes associated with TT or even subtropical cyclogenesis are over the region. This study presents a synoptic and dynamical analysis of the subtropical cyclone Anita which occurred in March 2010 near the Brazilian coast. This system started as a pure subtropical cyclone, evolved to a condition favorable to TT, later developed into a cold-core structure, and decayed as an extratropical cyclone. During the period favorable for TT, the turbulent heat fluxes (latent plus sensible) from the ocean decreased, and Anita started interacting with another extratropical disturbance, preventing the TT to happen. This interaction, in turn, increased the vertical wind shear, allowed the extratropical transition to occur, and promoted the westward displacement of Anita to colder waters, thus decreasing the turbulent heat fluxes. The results suggest that the combination of a dipole blocking pattern aloft, with contribution from barotropic energy conversions, and strong turbulent fluxes is an important ingredient for tropical storm development. Hybrid storms in such environmental conditions can be one form of precursors of hurricanes over the South Atlantic. Key Points Indicates environmental conditions that may favor TT over SAO Suggests importance of the diabatic contribution from the air-sea interaction Shows the Rossby wave breaking event as an important dynamical forcing ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63252
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Institute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo, Rua do Matão, 1226, Cidade Universitária, 05508-090 São Paulo, Brazil; Institute of Natural Resources, Federal University of Itajubá, Itajubá, Brazil
Recommended Citation:
Dias Pinto J.R.,Reboita M.S.,Da Rocha R.P.. Synoptic and dynamical analysis of subtropical cyclone Anita (2010) and its potential for tropical transition over the South Atlantic Ocean[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(19)