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dc.contributor.authorKwasniok, F
dc.contributor.authorBeaumont, R
dc.contributor.authorThuburn, J
dc.date.accessioned2019-03-18T09:13:48Z
dc.date.issued2019-01-22
dc.description.abstractThe dynamics of the polar vortex underlying stratospheric sudden warming (SSW) events are investigated in a data-based diagnostic study. Potential vorticity (PV) contour integral quantities on isentropic surfaces are discussed in a unified framework; new expressions for their time evolution, particularly suitable for evaluation from data, are presented and related to previous work. Diagnostics of mass and circulation are calculated from ERA-40 reanalysis data for the stratosphere in case-studies of seven winters with different SSW behaviour. The edge of the polar vortex is easily identifiable in these diagnostics as an abrupt transition from high to low gradients of PV, and the warming events are clearly visible. The amount of air stripped from the vortex as part of a preconditioning leading up to the warming events is determined using the balance equation of the mass integral. Significant persistent removal of mass from the vortex is found, with several such stripping events identifiable throughout the winter, especially in those during which a major sudden warming event occurred. These stripping episodes are visible in corresponding PV maps, where tongues of high PV are being stripped from the vortex and mixed into the surrounding surf zone. An attempt is made to diagnose from the balance equation of the circulation the effect of frictional forces such as gravity wave dissipation on the polar vortex.en_GB
dc.description.sponsorshipEPSRCen_GB
dc.identifier.citationPublished online 22-01-2019en_GB
dc.identifier.doi10.1002/qj.3474
dc.identifier.grantnumberDoctoral Training Granten_GB
dc.identifier.urihttp://hdl.handle.net/10871/36524
dc.language.isoenen_GB
dc.publisherWiley / Royal Meteorological Societyen_GB
dc.rights© 2019 The Authors. Quarterly Journal of the Royal Meteorological Society published by John Wiley & Sons Ltd on behalf of the Royal Meteorological Society.en_GB
dc.subjectpolar vortexen_GB
dc.subjectstratospheric sudden warming eventsen_GB
dc.subjectPV contour integral diagnosticsen_GB
dc.subjectstripping of filaments of airen_GB
dc.subjectpreconditioningen_GB
dc.titleVortex dynamics of stratospheric sudden warmings: a reanalysis data study using PV contour integral diagnosticsen_GB
dc.typeArticleen_GB
dc.date.available2019-03-18T09:13:48Z
dc.identifier.issn0035-9009
dc.descriptionThis is the author accepted manuscript. The final version is available from Wiley via the DOI in this record.en_GB
dc.descriptionERA‐40 reanalysis dataset produced by the European Centre for Medium‐Range Weather Forecasts (ECMWF) and provided by the British Atmospheric Data Centre (BADC).en_GB
dc.identifier.journalQuarterly Journal of the Royal Meteorological Societyen_GB
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_GB
dcterms.dateAccepted2019-01-15
rioxxterms.versionAMen_GB
rioxxterms.licenseref.startdate2019-01-22
rioxxterms.typeJournal Article/Reviewen_GB
refterms.dateFCD2019-03-18T09:05:25Z
refterms.versionFCDAM
refterms.dateFOA2019-03-18T09:13:50Z
refterms.panelBen_GB


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© 2019 The Authors. Quarterly Journal of the Royal Meteorological Society published by John Wiley & Sons Ltd on behalf of the Royal Meteorological Society.
Except where otherwise noted, this item's licence is described as © 2019 The Authors. Quarterly Journal of the Royal Meteorological Society published by John Wiley & Sons Ltd on behalf of the Royal Meteorological Society.