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dc.contributor.authorSpensberger, Clemenseng
dc.contributor.authorSpengler, Thomaseng
dc.date.accessioned2015-10-20T09:01:46Z
dc.date.available2015-10-20T09:01:46Z
dc.date.issued2014-11
dc.identifier.issn0022-4928en_US
dc.identifier.urihttps://hdl.handle.net/1956/10588
dc.description.abstractDeformation plays a key role in atmospheric dynamics because it provides a dynamical measure of the interaction between different scales, such as in frontogenesis. A climatology of deformation constructed from Interim ECMWF Re-Analysis (ERA-Interim) data (1979–2013) reveals four main processes associated with deformation: 1) frontogenesis at lower levels, 2) movement and evolution of jet streams in the upper troposphere, 3) orographic blocking, and 4) Rossby wave breaking. The merits of deformation as an additional perspective are discussed for these processes on the basis of case studies and composite analyses in conjunction with analytic solutions. This study shows that deformation can be used to unambiguously detect orographic blocking through the local strength of the flow diversion around orography. Moreover, the deformation signature for orographic blocking observed in case studies and composites closely resembles the analytic solution for two-dimensional flow around an obstacle. The climatology also reveals that Rossby wave breaking is associated with a characteristic γ-shaped deformation maximum. A composite analysis of this process confirms previous findings that suggested a dynamic link between Rossby wave breaking and dynamic blocking. It is shown that the deformation associated with Rossby wave breaking is aligned with the observed mean deformation upstream and downstream of a blocking high. Therefore, the presented composites illustrate a potential mechanism pinpointing how Rossby wave breaking can act to reinforce the flow diversion around the block.en_US
dc.language.isoengeng
dc.publisherAmerican Meteorological Societyen_US
dc.relation.ispartof<a href="http://hdl.handle.net/1956/10589" target="_blank">New approaches to investigate the influence of orographic and dynamic blocking on large-scale atmospheric flow</a>en_US
dc.subjectExtratropicseng
dc.subjectBlockingeng
dc.subjectDynamicseng
dc.subjectRossby waveseng
dc.titleA New Look at Deformation as a Diagnostic for Large-Scale Flowen_US
dc.typePeer reviewed
dc.typeJournal article
dc.description.versionpublishedVersionen_US
dc.rights.holderCopyright 2014 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act September 2010 Page 2 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Act (17 USC §108, as revised by P.L. 94-553) does not require the AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a web site or in a searchable database, or other uses of this material, except as exempted by the above statement, requires written permission or a license from the AMS. Additional details are provided in the AMS Copyright Policy, available on the AMS Web site located at (http://www.ametsoc.org/) or from the AMS at 617-227-2425 or copyrights@ametsoc.org.en_US
dc.identifier.doihttps://doi.org/10.1175/jas-d-14-0108.1
dc.identifier.cristin1207419
dc.source.journalJournal of the Atmospheric Sciences
dc.source.4071
dc.source.pagenumber4221-4234


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