Publication:
Southern hemisphere sensitivity to ENSO patterns and intensities: impacts over subtropical South America

dc.contributor.authorMartín Gómez, Verónica
dc.contributor.authorBarreiro, Marcelo
dc.contributor.authorMohino Harris, Elsa
dc.date.accessioned2023-06-16T15:17:28Z
dc.date.available2023-06-16T15:17:28Z
dc.date.issued2020-01-09
dc.description© The Authors. The authors acknowledge NOAA’s National Centers for Environmental Information for providing the ERSST.v4, OLR data and the NCEP-DOE Reanalysis II (all of them available at http://www.esrl.noaa. gov/psd). The authors also thank Franco Molteni and Fred Kucharski for developing and freely providing the Speedy model.
dc.description.abstractEl Niño flavors influence Subtropical South American (SSA) rainfall through the generation of one or two quasi-stationary Rossby waves. However, it is not yet clear whether the induced wave trains depend on the El Niño pattern and/or its intensity. To investigate this, we performed different sensitivity experiments using an Atmospheric General Circulation Model (AGCM) which was forced considering separately the Canonical and the El Niño Modoki patterns with sea surface temperature (SST) maximum anomalies of 1 and 3 ◦C. Experiments with 3 ◦C show that the Canonical El Niño induces two Rossby wave trains, a large one emanating from the western subtropical Pacific and a shorter one initiated over the central-eastern subtropical South Pacific. Only the shorter wave plays a role in generating negative outgoing longwave radiation (OLR) anomalies over SSA. On the other hand, 3 ◦C El Niño Modoki experiments show the generation of a large Rossby wave train that emanates from the subtropical western south Pacific and reaches South America (SA), promoting the development of negative OLR anomalies over SSA. Experiments with 1 ◦C show no impacts on OLR anomalies over SSA associated with El Niño Modoki. However, for the Canonical El Niño case there is a statistically significant reduction of the OLR anomalies over SSA related to the intensification of the upper level jet stream over the region. Finally, our model results suggest that SSA is more sensitive to the Canonical El Niño, although this result may be model dependent.
dc.description.departmentDepto. de Física de la Tierra y Astrofísica
dc.description.facultyFac. de Ciencias Físicas
dc.description.refereedTRUE
dc.description.sponsorshipNOAA’s National Centers
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/60277
dc.identifier.doi10.3390/atmos11010077
dc.identifier.issn2073-4433
dc.identifier.officialurlhttp://dx.doi.org/10.3390/atmos11010077
dc.identifier.relatedurlhttps://www.mdpi.com/
dc.identifier.urihttps://hdl.handle.net/20.500.14352/6207
dc.issue.number1
dc.journal.titleAtmosphere
dc.language.isoeng
dc.publisherMDPI AG
dc.rightsAtribución 3.0 España
dc.rights.accessRightsopen access
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/es/
dc.subject.cdu52
dc.subject.keywordEl Niño
dc.subject.keywordVariability
dc.subject.keywordPacific
dc.subject.keywordModoki
dc.subject.keywordOceans
dc.subject.keywordNiO
dc.subject.ucmFísica atmosférica
dc.subject.unesco2501 Ciencias de la Atmósfera
dc.titleSouthern hemisphere sensitivity to ENSO patterns and intensities: impacts over subtropical South America
dc.typejournal article
dc.volume.number11
dspace.entity.typePublication
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relation.isAuthorOfPublication84d10b42-61ac-49db-9b8e-96f321127a00
relation.isAuthorOfPublication.latestForDiscoveryb690bc41-c428-459a-b24c-341e6be99be4
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