Winter mixed layer development in the central Irminger Sea : the effect of strong, intermittent wind events


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dc.contributor.author Våge, Kjetil
dc.contributor.author Pickart, Robert S.
dc.date.accessioned 2010-11-02T13:29:35Z
dc.date.available 2010-11-02T13:29:35Z
dc.date.issued 2008-03
dc.identifier.citation Journal of Physical Oceanography 38 (2008): 541-565 en_US
dc.identifier.uri http://hdl.handle.net/1912/4034
dc.description Author Posting. © American Meteorological Society, 2008. 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 Physical Oceanography 38 (2008): 541-565, doi:10.1175/2007JPO3678.1. en_US
dc.description.abstract The impact of the Greenland tip jet on the wintertime mixed layer of the southwest Irminger Sea is investigated using in situ moored profiler data and a variety of atmospheric datasets. The mixed layer was observed to reach 400 m in the spring of 2003 and 300 m in the spring of 2004. Both of these winters were mild and characterized by a low North Atlantic Oscillation (NAO) index. A typical tip jet event is associated with a low pressure system that is advected by upper-level steering currents into the region east of Cape Farewell and interacts with the high topography of southern Greenland. Heat flux time series for the mooring site were constructed that include the enhancing influence of the tip jet events. This was used to force a one-dimensional mixed layer model, which was able to reproduce the observed envelope of mixed layer deepening in both winters. The deeper mixed layer of the first winter was largely due to a higher number of robust tip jet events, which in turn was caused by the steering currents focusing more storms adjacent to southern Greenland. Application of the mixed layer model to the winter of 1994–95, a period characterized by a high-NAO index, resulted in convection exceeding 1700 m. This prediction is consistent with hydrographic data collected in summer 1995, supporting the notion that deep convection can occur in the Irminger Sea during strong winters. en_US
dc.description.sponsorship KV and RP were supported by National Science Foundation Grant OCE-0450658. GWKM was supported by the Canadian Foundation for Climate and Atmospheric Sciences. MHR was supported by the Nordic Council of Ministers (West-Nordic Ocean Climate). en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher American Meteorological Society en_US
dc.relation.uri http://dx.doi.org/10.1175/2007JPO3678.1
dc.subject Mixed layer en_US
dc.subject Europe en_US
dc.subject Wind effects en_US
dc.subject In situ observations en_US
dc.subject North Atlantic Oscillation en_US
dc.title Winter mixed layer development in the central Irminger Sea : the effect of strong, intermittent wind events en_US
dc.type Article en_US
dc.identifier.doi 10.1175/2007JPO3678.1

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