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Nonlinear Zonal Wind Response to ENSO in the CMIP5 Models: Roles of the Zonal and Meridional Shift of the ITCZ/SPCZ and the Simulated Climatological Precipitation

Author(s): Choi, Kit-Yan; Vecchi, Gabriel A; Wittenberg, Andrew T

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dc.contributor.authorChoi, Kit-Yan-
dc.contributor.authorVecchi, Gabriel A-
dc.contributor.authorWittenberg, Andrew T-
dc.date.accessioned2022-01-25T15:00:10Z-
dc.date.available2022-01-25T15:00:10Z-
dc.date.issued2015-11-01en_US
dc.identifier.citationChoi, Kit-Yan, Gabriel A. Vecchi, and Andrew T. Wittenberg. "Nonlinear zonal wind response to ENSO in the CMIP5 models: Roles of the zonal and meridional shift of the ITCZ/SPCZ and the simulated climatological precipitation." Journal of Climate 28, no. 21 (2015): 8556-8573. doi:10.1175/JCLI-D-15-0211.1.en_US
dc.identifier.issn0894-8755-
dc.identifier.urihttp://arks.princeton.edu/ark:/88435/pr1d50fx2n-
dc.descriptionRelated Item links to supplemental information.en_US
dc.description.abstractThe observed equatorial Pacific zonal wind response during El Niño tends to be stronger than during La Niña. Most global coupled climate models in phase 5 of CMIP (CMIP5) exhibit such nonlinearity, although weaker than observed. The wind response nonlinearity can be reproduced by driving a linear shallow water atmospheric model with a model’s or the observed precipitation anomalies, which can be decomposed into two main components: the zonal and meridional redistribution of the climatological precipitation. Both redistributions contribute comparably to the total rainfall anomalies, whereas the zonal redistribution plays the dominant role in the zonal wind response. The meridional redistribution component plays an indirect role in the nonlinear wind response by limiting the zonal redistribution during La Niña and thus enhancing the nonlinearity in the wind response significantly. During La Niña, the poleward movement of the ITCZ/SPCZ reduces the equatorial zonal-mean precipitation available for the zonal redistribution and its resulting zonal wind response. Conversely, during El Niño, the equatorward movement of the ITCZ and SPCZ do not limit the zonal redistribution of precipitation. The linear equatorial zonal wind response to ENSO is found to have a significant linear correlation with the equatorial central Pacific climatological precipitation and SST among the CMIP5 models. However, no linear correlation is found between the nonlinear equatorial zonal wind response and the climatological precipitation.en_US
dc.format.extent8556 - 8573en_US
dc.language.isoen_USen_US
dc.relationhttp://dx.doi.org/10.1175/JCLI-D-15-0211.s1en_US
dc.relation.ispartofJournal of Climateen_US
dc.rightsFinal published version. Article is made available in OAR by the publisher's permission or policy.en_US
dc.titleNonlinear Zonal Wind Response to ENSO in the CMIP5 Models: Roles of the Zonal and Meridional Shift of the ITCZ/SPCZ and the Simulated Climatological Precipitationen_US
dc.typeJournal Articleen_US
dc.identifier.doidoi:10.1175/JCLI-D-15-0211.1-
dc.identifier.eissn1520-0442-
pu.type.symplectichttp://www.symplectic.co.uk/publications/atom-terms/1.0/journal-articleen_US

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