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dc.contributor.author
Muller, Gabriela Viviana  
dc.contributor.author
Ambrizzi, T.  
dc.contributor.author
Ferraz, S. E.  
dc.date.available
2019-07-29T14:43:55Z  
dc.date.issued
2008-06  
dc.identifier.citation
Muller, Gabriela Viviana; Ambrizzi, T.; Ferraz, S. E.; The role of the observed tropical convection in the generation of frost events in the southern cone of South America; Copernicus Publications; Annales Geophysicae; 26; 6; 6-2008; 1379-1390  
dc.identifier.issn
1432-0576  
dc.identifier.uri
http://hdl.handle.net/11336/80471  
dc.description.abstract
Based on previous results obtained from observations and linear wave theory analysis, the hypothesis that large-scale patterns can generate extreme cold events in southeast South America through the propagation of remotely excited Rossby waves was already suggested. This work will confirm these findings and extend their analysis through a series of numerical experiments using a primitive equation model where waves are excited by a thermal forcing situated in positions chosen according to observed convection anomalies over the equatorial region. The basic state used for these experiments is a composite of austral winters with maximum and minimum frequency of occurrence of generalized frosts that can affect a large area known as the Wet Pampas located in the central and eastern part of Argentina. The results suggest that stationary Rossby waves may be one important mechanism linking anomalous tropical convection with the extreme cold events in the Wet Pampas. The combination of tropical convection and a specific basic state can generate the right environment to guide the Rossby waves trigged by the tropical forcing towards South America. Depending on the phase of the waves entering the South American continent, they can favour the advection of anomalous wind at low levels from the south carrying cold and dry air over the whole southern extreme of the continent, producing a generalized frost in the Wet Pampa region. On the other hand, when a basic state based on the composites of minimum frosts is used, an anomalous anticyclone over the southern part of the continent generates a circulation with a south-southeast wind which brings maritime air and therefore humidity over the Wet Pampas region, creating negative temperature anomalies only over the northeastern part of the region. Under these conditions even if frosts occur they would not be generalized, as observed for the other basic state with maximum frequency of occurrence of generalized frosts.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Copernicus Publications  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by/2.5/ar/  
dc.subject
Climatology  
dc.subject
General Circulation  
dc.subject
Middle Atmosphere Dynamics  
dc.subject.classification
Meteorología y Ciencias Atmosféricas  
dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente  
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS  
dc.title
The role of the observed tropical convection in the generation of frost events in the southern cone of South America  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2019-07-26T13:36:22Z  
dc.journal.volume
26  
dc.journal.number
6  
dc.journal.pagination
1379-1390  
dc.journal.pais
Alemania  
dc.journal.ciudad
Gottingen  
dc.description.fil
Fil: Muller, Gabriela Viviana. Provincia de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Universidad Autónoma de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción; Argentina  
dc.description.fil
Fil: Ambrizzi, T.. Universidade de Sao Paulo; Brasil  
dc.description.fil
Fil: Ferraz, S. E.. Universidade Federal de Santa Maria; Brasil  
dc.journal.title
Annales Geophysicae  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.5194/angeo-26-1379-2008  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.ann-geophys.net/26/1379/2008/