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dc.contributor.authorDunn-Sigouin, Etienne
dc.contributor.authorShaw, Tiffany
dc.date.accessioned2021-06-16T12:29:44Z
dc.date.available2021-06-16T12:29:44Z
dc.date.created2020-05-07T10:18:23Z
dc.date.issued2020-05-28
dc.PublishedJournal of the Atmospheric Sciences. 2020, 27 (6), 2187-2202.
dc.identifier.issn0022-4928
dc.identifier.urihttps://hdl.handle.net/11250/2759787
dc.description.abstractExtreme stratospheric eddy and sudden stratospheric warming (SSW) events both involve anomalous stratospheric eddy heat flux. The cause of the anomaly has been hypothesized to be due to tropospheric or stratospheric dynamics. Here, ensemble spectral nudging experiments in a dry dynamical-core model are used to quantify the role of the troposphere versus the stratosphere. The experiments focus on the wavenumber-1 heat flux since it dominates the anomalous stratospheric eddy heat flux during both events. Nudging the stratospheric zonal-mean flow does not account for the anomalous stratospheric wave-1 heat flux. Nudging either tropospheric wave-1 or higher-order wavenumbers (k ≥ 2) accounts for a large fraction of the anomalous stratospheric wave-1 heat flux. Mechanism denial experiments, whereby tropospheric eddies (wave 1 or k ≥ 2) are nudged and the zonal-mean flow is fixed to climatology, suggest the climatological stratospheric zonal-mean flow is sufficient to account for the anomalous stratospheric wave-1 heat flux and wave–wave interaction plays a role in generating the anomalous tropospheric wave-1 source. Taken together, the experiments suggest the troposphere dominates the anomalous stratospheric eddy heat flux during extreme stratospheric eddy and SSW events while the stratospheric zonal-mean flow plays secondary role.en_US
dc.language.isoengen_US
dc.publisherAmerican Meteorological Societyen_US
dc.relation.urihttps://journals.ametsoc.org/view/journals/atsc/77/6/JAS-D-19-0231.1.xml
dc.titleDynamics of anomalous stratospheric eddy heat flux events in an idealized modelen_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US
dc.description.versionpublishedVersionen_US
dc.rights.holderCopyright 2020 American Meteorological Societyen_US
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode2
dc.identifier.doi10.1175/JAS-D-19-0231.1
dc.identifier.cristin1809743
dc.source.journalJournal of the Atmospheric Sciencesen_US
dc.source.4027
dc.source.146
dc.source.pagenumber2187-2202en_US
dc.identifier.citationJournal of the Atmospheric Sciences. 2020, 77 (6), 2187-2202en_US
dc.source.volume77en_US
dc.source.issue6en_US


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