Rossby waves as key drivers of the South American Monsoon high-frequency variability

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dc.catalogadorjwg
dc.contributor.authorAguirre Correa Francisca
dc.contributor.authorBollasina, Massimo
dc.contributor.authorGarreaud, René
dc.contributor.authorSuarez Poch, Francisco
dc.date.accessioned2025-06-04T20:57:10Z
dc.date.available2025-06-04T20:57:10Z
dc.date.issued2025
dc.description.abstractThe seasonal cycle of precipitation in South America (SA) peaks in intensity during austral summer (DJF), contributing up to 80% of the total annual rainfall. This seasonality is influenced by variability at different time-scales. At the subseasonal range, there is a lack of understanding of the mechanisms controlling high-frequency transients (8–20 days) of precipitation, which accounts for 60% of the total DJF subseasonal variance. Our results show that the observed high-frequency variability features a dipole pattern in SA, whose phase is controlled by the complex interplay between upper-tropospheric Rossby waves, remotely triggered by variability in the South Pacific Convergence Zone (SPCZ) convective activity, and regional low-tropospheric moisture transport and topography. The nature of the remotely-generated signal is further identified in sensitivity experiments with a Linear Baroclinic Model. Our results indicate that this teleconnection pattern can be used as a potential tool for subseasonal precipitation predictability, and that addressing model biases in simulating the spatio-temporal characteristics of SPCZ precipitation is important for near-hemispheric climate projections.
dc.fuente.origenORCID
dc.identifier.doi10.1016/j.atmosres.2025.108206
dc.identifier.urihttps://doi.org/10.1016/j.atmosres.2025.108206
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/104592
dc.information.autorucEscuela de Ingeniería; Suarez Poch, Francisco; 0000-0002-4394-957X; 15891
dc.information.autorucEscuela de Ingeniería; Aguirre Correa Francisca; 0000-0001-5346-4472; 245616
dc.nota.accesocontenido completo
dc.rightsacceso restringido
dc.subjectSouth American Monsoon
dc.subjectHigh-frequency variability
dc.subjectRossby waves
dc.subjectSouth Pacific
dc.subjectConvergence Zone
dc.subjectTeleconnections
dc.subject.ddc550
dc.subject.deweyCiencias de la tierraes_ES
dc.titleRossby waves as key drivers of the South American Monsoon high-frequency variability
dc.typeartículo
sipa.codpersvinculados15891
sipa.codpersvinculados245616
sipa.trazabilidadORCID;2025-06-03
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