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dc.contributor.author
Machado Crespo, Natalia
dc.contributor.author
da Rocha, Rosmeri Porfirio
dc.contributor.author
Sprenger, Michael
dc.contributor.author
Wernli, Heini
dc.date.accessioned
2021-01-08T14:01:58Z
dc.date.available
2020-06-20T02:55:14Z
dc.date.available
2020-06-22T06:59:00Z
dc.date.available
2021-01-08T14:01:58Z
dc.date.issued
2021-01
dc.identifier.issn
0899-8418
dc.identifier.issn
1097-0088
dc.identifier.other
10.1002/joc.6644
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/421440
dc.description.abstract
This study investigates the influence of upper‐level potential vorticity (PV) structures on surface cyclogenesis in central‐eastern South America using 1979–2017 ERA‐Interim reanalysis data. Surface cyclones are identified in three regions (Argentina, Uruguay and SEBrazil) and it is quantified how often PV streamers and PV cutoffs co‐occur with cyclogenesis events. There are interesting regional and seasonal differences: in Argentina PV streamers occur mainly with cyclogenesis in summer, and in Uruguay and SEBrazil in both summer and winter. In the three regions, PV streamers associated with cyclogenesis occur most frequently at 320 K, except for summer in SEBrazil, where they predominate at 340 K. PV cutoffs occur with lower frequencies than PV streamers during cyclogenesis, and they occur more often in summer than in winter in all three regions. The dynamics of cyclogenesis differs among the three regions in some important aspects. In Argentina, the environment is slightly more baroclinic in summer and genesis occurs beneath the equatorial entrance of a jet streak. In this season, the anomalous PV associated with a PV streamer is important to favour ascent in the baroclinic environment contributing to surface cyclogenesis. Similar patterns occur for cyclogenesis in summer and winter in Uruguay, and in winter in SEBrazil. In Argentina during winter, cyclogenesis is located beneath the poleward exit of a jet streak, with a weaker PV streamer upstream. In SEBrazil during summer, the jet stream is far displaced from the genesis region and cyclogenesis occurs in a more barotropic environment.
en_US
dc.language.iso
en
en_US
dc.publisher
Wiley
en_US
dc.subject
Cyclogenesis
en_US
dc.subject
Potential vorticity
en_US
dc.subject
PV cutoffs
en_US
dc.subject
PV streamers
en_US
dc.subject
South America
en_US
dc.title
A potential vorticity perspective on cyclogenesis over centre-eastern South America
en_US
dc.type
Journal Article
dc.date.published
2020-05-13
ethz.journal.title
International Journal of Climatology
ethz.journal.volume
41
en_US
ethz.journal.issue
1
en_US
ethz.journal.abbreviated
Int. j. climatol.
ethz.pages.start
663
en_US
ethz.pages.end
678
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Chichester
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02717 - Institut für Atmosphäre und Klima / Inst. Atmospheric and Climate Science::03854 - Wernli, Johann Heinrich / Wernli, Johann Heinrich
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02717 - Institut für Atmosphäre und Klima / Inst. Atmospheric and Climate Science::03854 - Wernli, Johann Heinrich / Wernli, Johann Heinrich
ethz.date.deposited
2020-06-20T02:55:19Z
ethz.source
WOS
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2021-01-08T14:02:06Z
ethz.rosetta.lastUpdated
2021-01-08T14:02:06Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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