Revisiting wintertime cold air intrusions at the east of the Andes: propagating features from subtropical Argentina to Peruvian Amazon and relationship with large-scale circulation patterns

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dc.contributor.authorEspinoza, Jhan Carlo
dc.contributor.authorRonchail, Josyane
dc.contributor.authorLengaigne, Matthieu
dc.contributor.authorQuispe, Nelson
dc.contributor.authorSilva Vidal, Yamina
dc.contributor.authorBettolli, María Laura
dc.contributor.authorAvalos, Grinia
dc.contributor.authorLlacza, Alan
dc.coverage.spatialCoordillera Central
dc.coverage.spatialAmazonas
dc.coverage.spatialPerú
dc.coverage.spatialArgentina
dc.date.accessioned2018-09-17T16:10:53Z
dc.date.available2018-09-17T16:10:53Z
dc.date.issued2013
dc.description.abstractThis study investigates the spatial and temporal characteristics of cold surges that propagates northward along the eastern flank of the Andes from subtropical to tropical South America analysing wintertime in situ daily minimum temperature observations from Argentina, Bolivia and Peru and ERA-40 reanalysis over the 1975–2001 period. Cold surges usually last 2 or 3 days but are generally less persistent in the southern La Plata basin compared to tropical regions. On average, three to four cold surges are reported each year. Our analysis reveals that 52 % of cold episodes registered in the south of La Plata basin propagate northward to the northern Peruvian Amazon at a speed of around 20 m s⁻¹. In comparison to cold surges that do not reach the tropical region, we demonstrate that these cold surges are characterized, before they reach the tropical region, by a higher occurrence of a specific circulation pattern associated to southern low-level winds progression toward low latitudes combined with subsidence and dry condition in the middle and low troposphere that reinforce the cold episode through a radiative effect. Finally, the relationship between cold surges and atmosphere dynamics is illustrated for the two most severe cold intrusions that reached the Peruvian and Bolivian Amazon in the last 20 years.es_ES
dc.description.peer-reviewPor pareses_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationEspinoza, J. C., Ronchail, J., Lengaigne, M., Quispe, N., Silva, Y., Bettolli, M. L., ... Llacza, A. (2013). Revisiting wintertime cold air intrusions at the east of the Andes: propagating features from subtropical Argentina to Peruvian Amazon and relationship with large-scale circulation patterns.==$Climate Dynamics, 41,$==1983-2002. https://doi.org/10.1007/s00382-012-1639-yes_ES
dc.identifier.doihttps://doi.org/10.1007/s00382-012-1639-yes_ES
dc.identifier.govdocindex-oti2018
dc.identifier.journalClimate Dynamicses_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/2969
dc.language.isoenges_ES
dc.publisherSpringeres_ES
dc.relation.ispartofurn:issn:0930-7575
dc.rightsinfo:eu-repo/semantics/restrictedAccesses_ES
dc.subjectPeruvian Amazones_ES
dc.subjectBolivian Amazones_ES
dc.subjectArgentinaes_ES
dc.subjectCold surgeses_ES
dc.subjectLow-level windses_ES
dc.subjectCirculation patternses_ES
dc.subjectSelf-organizing mapses_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.00es_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.09es_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.10es_ES
dc.titleRevisiting wintertime cold air intrusions at the east of the Andes: propagating features from subtropical Argentina to Peruvian Amazon and relationship with large-scale circulation patternses_ES
dc.typeinfo:eu-repo/semantics/articlees_ES

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