Subtropical Cyclones over the Southwestern South Atlantic: Climatological Aspects and Case Study

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dc.contributor.authorGozzo, Luiz Felippe
dc.contributor.authorRocha, Rosmeri P. da
dc.contributor.authorReboita, Michelle S.
dc.contributor.authorSugahara, Shigetoshi [UNESP]
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniv Itajuba
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2015-03-18T15:55:44Z
dc.date.available2015-03-18T15:55:44Z
dc.date.issued2014-11-15
dc.description.abstractHurricane Catarina (2004) and subtropical storm Anita (2010) called attention to the development of subtropical cyclones (SCs) over the South Atlantic basin. Besides strong and organized storms, a large number of weaker, shallower cyclones with both extratropical and tropical characteristics form in the region, impacting the South American coast. The main focus of this study is to simulate a climatology of subtropical cyclones and their synoptic pattern over the South Atlantic, proposing a broader definition of these systems. In addition, a case study is presented to discuss the main characteristics of one weak SC. The Interim ECMWF Re-Analysis (ERA-Interim) and NCEP-NCAR reanalysis are used to construct the 33-yr (1979-2011) climatology, and a comparison between them is established. Both reanalyses show good agreement in the SCs' intensity, geographical distribution, and seasonal variability, but the interannual variability is poorly correlated. Anomaly composites for austral summer show that subtropical cyclogenesis occurs under a dipole-blocking pattern in upper levels. Upward motion is enhanced by the vertical temperature gradient between a midtropospheric cold cutoff low/trough and the intense low-level warm air advection by the South Atlantic subtropical high. Turbulent fluxes in the cyclone region are not above average during cyclogenesis, but the subtropical high flow advects great amounts of moisture from distant regions to fuel the convective activity. Although most of the SCs develop during austral summer (December-February), it is in autumn (March-May) that the most tropical environment is found (stronger surface fluxes and weaker vertical wind shear), leading to the most intense episodes.en
dc.description.affiliationUniv Sao Paulo, Dept Atmospher Sci, Sao Paulo, Brazil
dc.description.affiliationUniv Itajuba, Nat Resources Inst, Itajuba, MG, Brazil
dc.description.affiliationUNESP, Inst Pesquisas Meteorol, Bauru, Brazil
dc.description.affiliationUNESP, Programa Posgrad, Fac Ciencias, Bauru, Brazil
dc.description.affiliationUnespUNESP, Inst Pesquisas Meteorol, Bauru, Brazil
dc.description.affiliationUnespUNESP, Programa Posgrad, Fac Ciencias, Bauru, Brazil
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipIdCNPq: 558121/2009-8
dc.description.sponsorshipIdCNPq: 307202/2011-9
dc.description.sponsorshipIdCNPq: 140839/2011-9
dc.description.sponsorshipIdCNPq: 481942/2013-0
dc.format.extent8543-8562
dc.identifierhttp://dx.doi.org/10.1175/JCLI-D-14-00149.1
dc.identifier.citationJournal Of Climate. Boston: Amer Meteorological Soc, v. 27, n. 22, p. 8543-8562, 2014.
dc.identifier.doi10.1175/JCLI-D-14-00149.1
dc.identifier.issn0894-8755
dc.identifier.lattes2360487877381570
dc.identifier.urihttp://hdl.handle.net/11449/117295
dc.identifier.wosWOS:000344774200016
dc.language.isoeng
dc.publisherAmer Meteorological Soc
dc.relation.ispartofJournal Of Climate
dc.relation.ispartofjcr4.661
dc.relation.ispartofsjr3,854
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectCyclogenesisen
dc.subjectcyclolysisen
dc.subjectSubtropical cyclonesen
dc.subjectClimatologyen
dc.titleSubtropical Cyclones over the Southwestern South Atlantic: Climatological Aspects and Case Studyen
dc.typeArtigo
dcterms.rightsHolderAmer Meteorological Soc
unesp.author.lattes2360487877381570[1]
unesp.campusUniversidade Estadual Paulista (Unesp), Centro de Meteorologia (IPMet), Baurupt

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