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dc.contributor.authorOltmanns, Marilena  Concept link
dc.contributor.authorStraneo, Fiamma  Concept link
dc.contributor.authorMoore, G. W. K.  Concept link
dc.contributor.authorMernild, Sebastian H.  Concept link
dc.date.accessioned2014-03-12T19:35:09Z
dc.date.available2014-10-22T08:57:26Z
dc.date.issued2014-02-01
dc.identifier.citationJournal of Climate 27 (2014): 977–99en_US
dc.identifier.urihttps://hdl.handle.net/1912/6481
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): 977–99, doi:10.1175/JCLI-D-13-00067.1.en_US
dc.description.abstractAmmassalik in southeast Greenland is known for strong wind events that can reach hurricane intensity and cause severe destruction in the local town. Yet, these winds and their impact on the nearby fjord and shelf region have not been studied in detail. Here, data from two meteorological stations and the European Centre for Medium-Range Weather Forecasts Interim Re-Analysis (ERA-Interim) are used to identify and characterize these strong downslope wind events, which are especially pronounced at a major east Greenland fjord, Sermilik Fjord, within Ammassalik. Their local and regional characteristics, their dynamics and their impacts on the regional sea ice cover, and air–sea fluxes are described. Based on a composite of the events it is concluded that wind events last for approximately a day, and seven to eight events occur each winter. Downslope wind events are associated with a deep synoptic-scale cyclone between Iceland and Greenland. During the events, cold dry air is advected down the ice sheet. The downslope flow is accelerated by gravitational acceleration, flow convergence inside the Ammassalik valley, and near the coast by an additional thermal and synoptic-scale pressure gradient acceleration. Wind events are associated with a large buoyancy loss over the Irminger Sea, and it is estimated that they drive one-fifth of the net wintertime loss. Also, the extreme winds drive sea ice out of the fjord and away from the shelf.en_US
dc.description.sponsorshipThis study was supported by grants of the National Science Foundation (OCE-0751554 and OCE-1130008) as well as the Natural Sciences and Engineering Research Council of Canada.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-13-00067.1
dc.subjectDownslope windsen_US
dc.subjectSynoptic climatologyen_US
dc.subjectKatabatic windsen_US
dc.subjectAir-sea interactionen_US
dc.titleStrong downslope wind events in Ammassalik, southeast Greenlanden_US
dc.typeArticleen_US
dc.description.embargo2014-08-01en_US
dc.identifier.doi10.1175/JCLI-D-13-00067.1


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