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Extreme air–sea interaction over the North Atlantic subpolar gyre during the winter of 2013–2014 and its sub-surface legacy

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Title: Extreme air–sea interaction over the North Atlantic subpolar gyre during the winter of 2013–2014 and its sub-surface legacy
Authors: Grist, JP
Josey, SA
Jacobs, ZL
Marsh, R
Sinha, B
Van Sebille, E
Item Type: Journal Article
Abstract: Exceptionally low North American temperatures and record-breaking precipitation over the British Isles during winter 2013–2014 were interconnected by anomalous ocean evaporation over the North Atlantic subpolar gyre region (SPG). This evaporation (or oceanic latent heat release) was accompanied by strong sensible heat loss to the atmosphere. The enhanced heat loss over the SPG was caused by a combination of surface westerly winds from the North American continent and northerly winds from the Nordic Seas region that were colder, drier and stronger than normal. A distinctive feature of the air–sea exchange was that the enhanced heat loss spanned the entire width of the SPG, with evaporation anomalies intensifying in the east while sensible heat flux anomalies were slightly stronger upstream in the west. The immediate impact of the strong air–sea fluxes on the ocean–atmosphere system included a reduction in ocean heat content of the SPG and a shift in basin-scale pathways of ocean heat and atmospheric freshwater transport. Atmospheric reanalysis data and the EN4 ocean data set indicate that a longerterm legacy of the winter has been the enhanced formation of a particularly dense mode of Subpolar Mode Water (SPMW)—one of the precursors of North Atlantic Deep Water and thus an important component of the Atlantic Meridional Overturning Circulation. Using particle trajectory analysis, the likely dispersal of newly-formed SPMW is evaluated, providing evidence for the re-emergence of anomalously cold SPMW in early winter 2014/2015.
Issue Date: 5-Sep-2015
Date of Acceptance: 25-Aug-2015
URI: http://hdl.handle.net/10044/1/27710
DOI: https://dx.doi.org/10.1007/s00382-015-2819-3
ISSN: 1432-0894
Publisher: Springer Verlag (Germany)
Start Page: 4027
End Page: 4045
Journal / Book Title: Climate Dynamics
Volume: 46
Issue: 11
Copyright Statement: The final publication is available at Springer via http://dx.doi.org/10.1007/s00382-015-2819-3
Keywords: Science & Technology
Physical Sciences
Meteorology & Atmospheric Sciences
North Atlantic Ocean
Air-sea fluxes
Ocean heat content
Subpolar Mode Water
Winter 2013-2014
MERIDIONAL OVERTURNING CIRCULATION
SURFACE HEAT
THERMOHALINE CIRCULATION
OCEAN TEMPERATURE
VARIABILITY
SYSTEM
FLUXES
0401 Atmospheric Sciences
0405 Oceanography
Publication Status: Published
Appears in Collections:Centre for Environmental Policy
Faculty of Natural Sciences



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