Summertime precipitation extremes and the influence of atmospheric flows on the western slopes of the southern Andes of Perú

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dc.contributor.authorVillalobos-Puma, Elver
dc.contributor.authorFlores Rojas, José Luis
dc.contributor.authorMartinez-Castro, Daniel
dc.contributor.authorMorales, Annareli
dc.contributor.authorLavado-Casimiro, Waldo
dc.contributor.authorMosquera Vásquez, Kobi Alberto
dc.contributor.authorSilva Vidal, Yamina
dc.date.accessioned2022-11-23T15:55:46Z
dc.date.available2022-11-23T15:55:46Z
dc.date.issued2022-09-19
dc.description.abstractAlthough climatologically dry, the western slopes of the southern Andes of Peru (WSA) can experience precipitation extremes (PEs) during the summer (December–February) resulting in great economic and human losses. Generally, WSA has a positive upslope gradient in precipitation, meaning more rain falls at higher elevations, but observations have shown this gradient can become negative with higher rainfall near the coastal cities. In this study we analyse 2000–2019 regional atmospheric patterns associated with different upslope precipitation gradients and PEs in WSA using principal component analysis methods and surface station observations. Results show important changes in the atmospheric circulation patterns during the occurrence of PE events. A prevailing pattern of negative southerly wind anomalies and regional warming of the southeastern Pacific Ocean leads to significant increases in moisture along the coast of WSA. Eastern moisture flows associated with the presence of the Bolivian High are observed at upper levels of the atmosphere and transport water vapour from the Amazon to the western side of the Andes. Additionally, there is a blocking effect aloft in response to an intense gradient of geopotential height that attenuates the easterly circulations. These large-scale mechanisms act to concentrate high precipitable water amounts and high levels of convective available potential energy in the troposphere which favours the vertical velocities essential to trigger PEs. These results increase our knowledge of the large-scale characteristics of PEs to help with forecasting these impactful events and protecting the more than 1.8 million people living in WSA.es_ES
dc.description.peer-reviewPor pareses_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationVillalobos-Puma, E., Flores-Rojas, J. L., Martinez-Castro, D., Morales, A., Lavado-Casimiro, W., Mosquera-Vásquez, K., & Silva, Y. (2022). Summertime precipitation extremes and the influence of atmospheric flows on the western slopes of the southern Andes of Perú.==$International Journal of Climatology, 42$==(16), 9909-9930. https://doi.org/10.1002/joc.7871es_ES
dc.identifier.doihttps://doi.org/10.1002/joc.7871es_ES
dc.identifier.govdocindex-oti2018
dc.identifier.journalInternational Journal of Climatologyes_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/5319
dc.language.isoenges_ES
dc.publisherRoyal Meteorological Societyes_ES
dc.relation.ispartofurn:issn:1097-0088
dc.rightsinfo:eu-repo/semantics/closedAccesses_ES
dc.subjectAndeses_ES
dc.subjectLarge scalees_ES
dc.subjectMoisture flowses_ES
dc.subjectPrecipitable wateres_ES
dc.subjectPrecipitation extremeses_ES
dc.subjectPrecipitation gradientses_ES
dc.subject.ocdehttps://purl.org/pe-repo/ocde/ford#1.05.09es_ES
dc.titleSummertime precipitation extremes and the influence of atmospheric flows on the western slopes of the southern Andes of Perúes_ES
dc.typeinfo:eu-repo/semantics/articlees_ES

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