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dc.contributor.authorDing, Hui
dc.contributor.authorKeenlyside, Noel
dc.contributor.authorLatif, Mojib
dc.contributor.authorPark, Wonsun
dc.contributor.authorWahl, Sebastian
dc.date.accessioned2016-02-15T10:45:31Z
dc.date.available2016-02-15T10:45:31Z
dc.date.issued2015-02-23
dc.identifier.issn2169-9291en_US
dc.identifier.issn2169-9275en_US
dc.identifier.urihttps://hdl.handle.net/1956/11199
dc.description.abstractObservations show that the Equatorial Atlantic Zonal Mode (ZM) obeys similar physics to the El Niño Southern Oscillation (ENSO): positive Bjerknes and delayed negative feedbacks. This implies the ZM may be predictable on seasonal timescales, but models demonstrate little prediction skill in this region. In this study using different configurations of the Kiel Climate Model (KCM) exhibiting different levels of sys- tematic error, we show that a reasonable simulation of the ZM depends on realistic representation of the mean state, i.e., surface easterlies along the equator, upward sloping thermocline to the east, with an equa- torial SST cold tongue in the east. We further attribute the differences in interannual variability among the simulations to the individual components of the positive Bjerknes and delayed negative feedbacks. Differ- ences in the seasonality of the variability are similarly related to the impact of seasonal biases on the Bjerknes feedback. Our results suggest that model physics must be enhanced to enable skillful seasonal pre- dictions in the Tropical Atlantic Sector, although some improvement with regard to the simulation of Equa- torial Atlantic interannual variability may be achieved by momentum flux correction. This pertains especially to the seasonal phase locking of interannual SST variability.en_US
dc.language.isoengeng
dc.publisherAmerican Geophysical Unionen_US
dc.rightsCopyright 2015. American Geophysical Union. All Rights Reserved.eng
dc.titleThe impact of mean state errors on equatorial Atlantic interannual variability in a climate modelen_US
dc.typePeer reviewed
dc.typeJournal article
dc.description.versionpublishedVersionen_US
dc.source.journalJournal of Geophysical Research: Oceans
dc.source.40120
dc.source.142
dc.source.pagenumber1133-1151
dc.subject.nsiVDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Petroleumsgeologi og -geofysikk: 464en_US


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