Climatology of extreme cold events in the Central Peruvian Andes during austral Summer: Origin, types and teleconnections

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dc.contributor.authorSulca Jota, Juan Carlos
dc.contributor.authorVuille, Mathias
dc.contributor.authorRoundy, Paul
dc.contributor.authorTakahashi, Ken
dc.contributor.authorEspinoza, Jhan Carlo
dc.contributor.authorSilva Vidal, Yamina
dc.contributor.authorTrasmonte Soto, Grace Liliam
dc.contributor.authorZubieta Barragán, Ricardo
dc.coverage.spatialAndes
dc.coverage.spatialPerú
dc.date.accessioned2018-09-24T15:28:23Z
dc.date.available2018-09-24T15:28:23Z
dc.date.issued2018-10
dc.description.abstractThe climatological and large‐scale characteristics of the extreme cold events (ECEs) in the central Peruvian Andes (Mantaro basin (MB)) during austral summer (January–March) are examined using reanalysis, gridded and in‐situ surface minimum temperature (Tmin) data for the 1979‐2010 period. To describe the influence of the Madden‐Julian Oscillation (MJO) on ECEs in the MB, two ECE groups are defined on basis of the sign of the OLR anomalies in the MJO band (30‐100 days, 0‐9 eastward) at (75°W, 12.5°S). Type 1‐ ECEs occur during the suppressed convection phase of the MJO (OLR anomalies ≥ +2 W m²) while Type 2‐ECEs occur during the enhanced convection phase of the MJO (OLR anomalies ≤ ‐2 W m²). ECEs in the MB are associated with the advection of cold and dry air along the east of the Andes through equatorward propagation of extratropical Rossby wave trains (ERWTs). This cold advection weakens the Bolivian High‐Nordeste Low (BH‐NL) system over South America (SA) at upper‐tropospheric levels. The MJO is an important driver of ECEs in the MB, favoring the cold advection along the Andes during specific MJO phases. 59% of Type‐1 ECE's and 86% of Type‐2 ECE's occur in MJO Phases 7‐2. Type‐1 and 2 ECE's feature a weakened BH over SA at upper‐tropospheric levels. For Type‐1, ERWTs emanate from southeastern Africa in MJO Phases 8‐1 while ERWTs are strenghened when crossing the subtropical southern Pacific Ocean during MJO Phases 2 and 7. With respect to Type‐2, MJO Phases 7‐2 feature circumpolar Rossby wave trains propagation toward SA. Ultimately, MJO Phases 7‐2 induce negative Tmin anomalies over MB, while MJO Phases 3‐6 induce positive Tmin anomalies. El Niño and La Niña strengthen negative Tmin anomalies over the MB during MJO Phases 7‐8 while they weaken positive Tmin anomalies over the MB during MJO Phases 3‐6.es_ES
dc.description.peer-reviewPor pareses_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationSulca, J. C., Vuille, M., Roundy, P., Takahashi, K., Espinoza, J. -C., Silva, Y., ... Zubieta, R. (2018). Climatology of extreme cold events in the Central Peruvian Andes during austral Summer: Origin, types and teleconnections.==$Quarterly Journal of the Royal Meteorological Society, 144$==(717), 2693-2714. https://doi.org/10.1002/qj.3398es_ES
dc.identifier.doihttps://doi.org/10.1002/qj.3398es_ES
dc.identifier.govdocindex-oti2018
dc.identifier.journalQuarterly Journal of the Royal Meteorological Societyes_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/3055
dc.language.isoenges_ES
dc.publisherWileyes_ES
dc.relation.ispartofurn:issn:0035-9009
dc.rightsinfo:eu-repo/semantics/restrictedAccesses_ES
dc.subjectAtmospheric teleconnectionses_ES
dc.subjectBolivian highes_ES
dc.subjectCentral Peruvian Andeses_ES
dc.subjectENSOes_ES
dc.subjectExtratropical Rossby waveses_ES
dc.subjectExtreme cold episodeses_ES
dc.subjectMJOes_ES
dc.subjectSoutheastern Africaes_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.titleClimatology of extreme cold events in the Central Peruvian Andes during austral Summer: Origin, types and teleconnectionses_ES
dc.typeinfo:eu-repo/semantics/articlees_ES

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