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dc.contributor.authorSeo, Hyodae  Concept link
dc.contributor.authorSubramanian, Aneesh C.  Concept link
dc.contributor.authorMiller, Arthur J.  Concept link
dc.contributor.authorCavanaugh, Nicholas R.  Concept link
dc.date.accessioned2014-12-16T16:50:21Z
dc.date.available2015-05-15T09:08:36Z
dc.date.issued2014-11-15
dc.identifier.citationJournal of Climate 27 (2014): 8422–8443en_US
dc.identifier.urihttps://hdl.handle.net/1912/6996
dc.descriptionAuthor Posting. © American Meteorological Society, 2014. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Climate 27 (2014): 8422–8443, doi:10.1175/JCLI-D-14-00141.1.en_US
dc.description.abstractThis study quantifies, from a systematic set of regional ocean–atmosphere coupled model simulations employing various coupling intervals, the effect of subdaily sea surface temperature (SST) variability on the onset and intensity of Madden–Julian oscillation (MJO) convection in the Indian Ocean. The primary effect of diurnal SST variation (dSST) is to raise time-mean SST and latent heat flux (LH) prior to deep convection. Diurnal SST variation also strengthens the diurnal moistening of the troposphere by collocating the diurnal peak in LH with those of SST. Both effects enhance the convection such that the total precipitation amount scales quasi-linearly with preconvection dSST and time-mean SST. A column-integrated moist static energy (MSE) budget analysis confirms the critical role of diurnal SST variability in the buildup of column MSE and the strength of MJO convection via stronger time-mean LH and diurnal moistening. Two complementary atmosphere-only simulations further elucidate the role of SST conditions in the predictive skill of MJO. The atmospheric model forced with the persistent initial SST, lacking enhanced preconvection warming and moistening, produces a weaker and delayed convection than the diurnally coupled run. The atmospheric model with prescribed daily-mean SST from the coupled run, while eliminating the delayed peak, continues to exhibit weaker convection due to the lack of strong moistening on a diurnal basis. The fact that time-evolving SST with a diurnal cycle strongly influences the onset and intensity of MJO convection is consistent with previous studies that identified an improved representation of diurnal SST as a potential source of MJO predictability.en_US
dc.description.sponsorshipThe authors gratefully acknowledge support from the Office of Naval Research (N00014-13-1-0133 and N00014-13-1-0139) and National Science Foundation EaSM-3 (OCE-1419235). HS especially thanks the Penzance Endowed Fund for their support of Assistant Scientists at WHOI.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherAmerican Meteorological Societyen_US
dc.relation.urihttps://doi.org/10.1175/JCLI-D-14-00141.1
dc.subjectDeep convectionen_US
dc.subjectDiurnal effectsen_US
dc.subjectMadden-Julian oscillationen_US
dc.subjectAir-sea interactionen_US
dc.subjectNumerical weather prediction/forecastingen_US
dc.subjectRegional modelsen_US
dc.titleCoupled impacts of the diurnal cycle of sea surface temperature on the Madden–Julian oscillationen_US
dc.typeArticleen_US
dc.description.embargo2015-05-15en_US
dc.identifier.doi10.1175/JCLI-D-14-00141.1


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