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dc.contributor.authorGleixner, Stephanie Nikola
dc.contributor.authorKeenlyside, Noel
dc.contributor.authorViste, Ellen
dc.contributor.authorKorecha, Diriba
dc.date.accessioned2022-01-28T11:13:51Z
dc.date.available2022-01-28T11:13:51Z
dc.date.created2016-12-20T14:18:10Z
dc.date.issued2017
dc.identifier.issn0930-7575
dc.identifier.urihttps://hdl.handle.net/11250/2935292
dc.description.abstractWhile El Niño is known to cause failure of Kiremt (boreal summer) rainfall in Ethiopia, the mechanisms are not fully understood. Here we use the ECHAM5 Atmospheric General Circulation Model to investigate the physical link between Pacific sea surface temperature (SST) anomalies and Kiremt rainfall. We compare ECHAM5 simulations forced with reconstructed SST data, to gauge-based rainfall observations and atmospheric reanalysis for the time period of 1961–2009. We perform composite analysis and sensitivity experiments driven only with equatorial Pacific SST anomalies. Our results show warm SST anomalies in the equatorial Pacific drive a corresponding large-scale circulation anomaly with subsidence over Ethiopia in dry Kiremt seasons. Horizontal wind fields show a slow-down of the whole Indian monsoon system with a weaker Tropical Easterly Jet and a weaker East African Low-Level Jet in these summers. These changes can be seen as an anomalous circulation cell over northern Africa with westerlies at 100–200 hPa and easterlies below 500 hPa. Surface easterlies might reduce the moisture inflow from the Atlantic and Congo basin into Ethiopia. This and the general subsidence over the region could explain the reduction in Kiremt rainfall. Our results suggest up to 50% of the Kiremt rainfall anomalies is driven by equatorial Pacific SST variability.en_US
dc.language.isoengen_US
dc.publisherSpringeren_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.titleThe El Niño effect on Ethiopian summer rainfallen_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US
dc.description.versionpublishedVersionen_US
dc.rights.holderCopyright 2016 the authors.en_US
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2
dc.identifier.doi10.1007/s00382-016-3421-z
dc.identifier.cristin1415738
dc.source.journalClimate Dynamicsen_US
dc.source.pagenumber1865–1883en_US
dc.relation.projectNotur/NorStore: NN9385Ken_US
dc.relation.projectNotur/NorStore: NS9039Ken_US
dc.relation.projectNotur/NorStore: NS9207Ken_US
dc.relation.projectNotur/NorStore: NN9039Ken_US
dc.relation.projectNorges forskningsråd: 233680en_US
dc.relation.projectEU/648982en_US
dc.relation.projectEU/603521en_US
dc.identifier.citationClimate Dynamics. 2017, 49, 1865–1883.en_US
dc.source.volume49en_US


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Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal