Teleconnections between the Peruvian central Andes and northeast Brazil during extreme rainfall events in austral summer

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dc.contributor.authorSulca Jota, Juan Carlos
dc.contributor.authorVuille, Mathias
dc.contributor.authorSilva Vidal, Yamina
dc.contributor.authorTakahashi, Ken
dc.coverage.spatialAndes
dc.coverage.spatialBrasil
dc.date.accessioned2018-08-08T12:29:43Z
dc.date.available2018-08-08T12:29:43Z
dc.date.issued2016-02
dc.description.abstractExtreme precipitation events in the Peruvian Andes have significant socioeconomic impacts, yet their atmospheric dynamics are poorly understood. Here austral summer (December–March) wet and dry spells and their continental- and large-scale teleconnections are analyzed using reanalysis, gridded, and in situ precipitation data. Dry and wet spells in the Peruvian Andes show a pervasive dipole pattern with precipitation anomalies of the opposite sign over northeastern Brazil. Composite anomalies of various atmospheric fields during extreme precipitation events indicate that this dipole is related to large-scale adjustments in the upper-tropospheric Bolivian high–Nordeste low system, which in turn are modulated by northward-propagating extratropical Rossby wave trains. At upper- and midtropospheric levels, westerly wind anomalies over the Peruvian Andes suppress moisture flux from the Amazon during dry events, while wet events are characterized by opposite conditions. Yet, while easterly wind anomalies appear to be a prerequisite for heavy precipitation events in the region, they are not a sufficient forcing, as dry days can still occur during such periods. Dry spells in the Peruvian Andes appear to be linked to weakened convective activity over the western tropical Pacific, consistent with the previously documented El Niño influence over the region. Extreme dry and wet spells in northeastern Brazil only show a weak link to precipitation anomalies of the opposite sign over Peru but are strongly coupled with changes in the position and strength of the Nordeste low and the South Atlantic convergence zone.es_ES
dc.description.peer-reviewPor pareses_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationSulca, J., Vuille, M., Silva, Y., & Takahashi, K. (2016). Teleconnections between the Peruvian central Andes and northeast Brazil during extreme rainfall events in austral summer.==$Journal of Hydrometeorology, 17$==(2), 499-515. https://doi.org/10.1175/JHM-D-15-0034.1es_ES
dc.identifier.doihttps://doi.org/10.1175/JHM-D-15-0034.1es_ES
dc.identifier.govdocindex-oti2018
dc.identifier.journalJournal of Hydrometeorologyes_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/2307
dc.language.isoenges_ES
dc.publisherAmerican Meteorological Societyes_ES
dc.relation.ispartofurn:issn:1525-7541
dc.rightsinfo:eu-repo/semantics/openAccesses_ES
dc.rights.urihttps://creativecommons.org/licences/by/4.0/es_ES
dc.subjectAtmospheric circulationes_ES
dc.subjectTeleconnectionses_ES
dc.subjectOcean structurees_ES
dc.subjectExtreme eventses_ES
dc.subjectAtmospheric precipitationes_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#1.05.11es_ES
dc.titleTeleconnections between the Peruvian central Andes and northeast Brazil during extreme rainfall events in austral summeres_ES
dc.typeinfo:eu-repo/semantics/articlees_ES

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