| DOI: | 10.1175/JCLI-D-11-00212.1
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| Scopus记录号: | 2-s2.0-84870015448
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| 论文题名: | A climatology of subtropical cyclones in the South Atlantic |
| 作者: | Evans J.L.; Braun A.
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| 刊名: | Journal of Climate
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| ISSN: | 8948755
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| 出版年: | 2012
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| 卷: | 25, 期:21 | | 起始页码: | 7328
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| 结束页码: | 7340
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| 语种: | 英语
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| Scopus关键词: | Atlantic Ocean
; Brazil Current
; Climate classification/regimes
; Climate variability
; Cyclogenesis
; East coast
; Eastern Australia
; Formation mechanism
; Hybrid structure
; North Atlantic
; Rossby wave
; Seasonal variability
; South Atlantic
; Subtropics
; Tropical cyclone
; Warm seasons
; Hurricanes
; Ocean currents
; Storms
; Tropics
; Climatology
; climate variation
; climatology
; cyclogenesis
; lee cyclogenesis
; Rossby wave
; seasonal variation
; subtropical region
; tropical cyclone
; vorticity
; wave breaking
; Atlantic Ocean
; Atlantic Ocean (North)
; Atlantic Ocean (South)
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| 英文摘要: | A 50-yr climatology (1957-2007) of subtropical cyclones (STs) in the South Atlantic is developed and analyzed. A subtropical cyclone is a hybrid structure (upper-level cold core and lower-level warm core) with associated surface gale-force winds. The tendency for warm season development of North Atlantic STs has resulted in these systems being confused as tropical cyclones (TCs). In fact, North Atlantic STs are a regular source of the incipient vorticesleading to North Atlantic TC genesis. In 2004, Hurricane Catarina developed in the South Atlantic and made landfall in Brazil. A TC systemhad been previously unobserved in the South Atlantic, so the incidence of Catarina highlighted the lack of an ST climatology for the region to provide a context for thelikelihood of future systems. Sixty-three South Atlantic STs are documented over the 50-yr period analyzed in this climatology. In contrast to the North Atlantic, South Atlantic STs occur relatively uniformly throughout the year; however, their preferred location of genesis and mechanisms for this genesis doexhibit some seasonal variability. Rossby wave breaking was identified as the mechanism for the ST vortex initiation for North Atlantic STs. Asubset ofSouth Atlantic STs forms via this mechanism, however, an additional mechanism for ST genesis is identified here: lee cyclogenesis downstream of the Andes in the Brazil Current region-an area favorable for convection. This formation mechanism is similar to development of type-2 east coast lows in the Tasman Seaoff eastern Australia. © 2012 American Meteorological Society. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/52134
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| Appears in Collections: | 气候变化事实与影响
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作者单位: | Department of Meteorology, The Pennsylvania State University, University Park, PA, United States
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| Recommended Citation: | |
Evans J.L.,Braun A.. A climatology of subtropical cyclones in the South Atlantic[J]. Journal of Climate,2012-01-01,25(21)
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