Impacts of different ENSO flavors and tropical Pacific convection variability (ITCZ, SPCZ) on austral summer rainfall in South America, with a focus on Peru

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dc.contributor.authorSulca Jota, Juan Carlos
dc.contributor.authorTakahashi, Ken
dc.contributor.authorEspinoza, Jhan Carlo
dc.contributor.authorVuille, Mathias
dc.contributor.authorLavado-Casimiro, Waldo
dc.coverage.spatialSudamérica
dc.date.accessioned2018-08-06T12:59:21Z
dc.date.available2018-08-06T12:59:21Z
dc.date.issued2018-01
dc.description.abstractEl Niño in the eastern and central Pacific has different impacts on the rainfall of South America, and the atmospheric pathways through the South Pacific Convergence Zone (SPCZ) and Inter‐Tropical Convergence Zone (ITCZ) are poorly understood. To address this, we performed linear regression analysis of E (eastern Pacific) and C (central Pacific) indices of sea surface temperature (SST), as well as precipitation indices for the SPCZ and ITCZ, with gridded precipitation and reanalysis data sets during the austral summer (December–February) for the 1980–2016 period. Positive C induces dry anomalies along the tropical Andes and northern South America (NSA), while wet anomalies prevail over southeastern South America (SESA). Moreover, it produces wet conditions in the northwestern Peruvian Amazon. In contrast, positive E enhances wet conditions along the coasts of Ecuador and northern Peru associated with the southward displacement of the eastern Pacific ITCZ and induces dry conditions in Altiplano, Amazon basin, and northeastern Brazil (NEB). Both El Niño Southern Oscillation (ENSO) indices are associated with weakened upper‐level easterly flow over Peru, but it is more restricted to the central and southern Peruvian Andes with positive E. Both SPCZ indices, the zonal position of the SPCZ and its latitudinal displacement, suppress rainfall along western Peruvian Andes when are positive, but the latter also inhibits rainfall over the Bolivian Altiplano. They are also linked to upper‐level westerly wind anomalies overall of Peru, but these anomalies do not extend as far south in the first. The southward displacement of the eastern Pacific ITCZ also induces wet anomalies in SESA while dry anomalies prevail over NEB, the western Amazon basin, and Bolivia. Oppositely, the southward displacement of the central Pacific ITCZ induces dry anomalies in NEB and along the northern coast of Peru; while wet anomalies occur mainly in eastern Brazil, Paraguay, and Bolivia through an enhancement of the low level jet.es_ES
dc.description.peer-reviewPor pareses_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationSulca, J., Takahashi, K., Espinoza, J. -C., Vuille, M., & Lavado‐Casimiro, W. (2018). Impacts of different ENSO flavors and tropical Pacific convection variability (ITCZ, SPCZ) on austral summer rainfall in South America, with a focus on Peru.==$International Journal of Climatology, 38$==(1), 420-435. https://doi.org/10.1002/joc.5185es_ES
dc.identifier.doihttps://doi.org/10.1002/joc.5185es_ES
dc.identifier.govdocindex-oti2018
dc.identifier.journalInternational Journal of Climatologyes_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/2251
dc.language.isoenges_ES
dc.publisherRoyal Meteorological Societyes_ES
dc.relation.ispartofurn:issn:0899-8418
dc.rightsinfo:eu-repo/semantics/restrictedAccesses_ES
dc.subjectRainfalles_ES
dc.subjectAtmospheric teleconnectionses_ES
dc.subjectENSOes_ES
dc.subjectSPCZes_ES
dc.subjectITCZes_ES
dc.subjectSouth Americaes_ES
dc.subjectAndeses_ES
dc.subjectPerues_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.titleImpacts of different ENSO flavors and tropical Pacific convection variability (ITCZ, SPCZ) on austral summer rainfall in South America, with a focus on Perues_ES
dc.typeinfo:eu-repo/semantics/articlees_ES

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