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Coupling of Eastern and Western Subpolar North Atlantic: Salt Transport in the Irminger Current : Volume 10, Issue 2 (15/03/2013)

By Born, A.

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Book Id: WPLBN0004020754
Format Type: PDF Article :
File Size: Pages 25
Reproduction Date: 2015

Title: Coupling of Eastern and Western Subpolar North Atlantic: Salt Transport in the Irminger Current : Volume 10, Issue 2 (15/03/2013)  
Author: Born, A.
Volume: Vol. 10, Issue 2
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Stocker, T. F., Sandø, A. B., & Born, A. (2013). Coupling of Eastern and Western Subpolar North Atlantic: Salt Transport in the Irminger Current : Volume 10, Issue 2 (15/03/2013). Retrieved from http://worldlibrary.net/


Description
Description: Climate and Environmental Physics, Physics Institute, University of Bern, Bern, Switzerland. Salt transport in the Irminger Current and thus the coupling between eastern and western subpolar North Atlantic plays an important role for climate variability across a wide range of time scales. High-resolution ocean modeling and observations indicate that salinities in the eastern subpolar North Atlantic decrease with enhanced circulation of the North Atlantic subpolar gyre (SPG). This has led to the perception that a stronger SPG also transports less salt westward. In this study, we analyze a regional ocean model and a comprehensive global coupled climate model, and show that a stronger SPG transports more salt in the Irminger Current irrespective of lower salinities in its source region. The additional salt converges in the Labrador Sea and the Irminger Basin by eddy transports, increases surface salinity in the western SPG, and favors more intense deep convection. This is part of a positive feedback mechanism with potentially large implications for climate variability and predictability.

Summary
Coupling of eastern and western subpolar North Atlantic: salt transport in the Irminger Current

Excerpt
Bentsen, M. and Drange, H.: Parameterizing surface fluxes in ocean models using the NCEP/NCAR reanalysis data, in: RegClim General Technical Report No. 4, 149–158, Norwegian Institute for Air Research, Kjeller, 2000.; Bentsen, M., Drange, H., Furevik, T., and Zhou, T.: Simulated variability of the Atlantic meridional overturning circulation, Clim. Dynam., 22, 701–720, doi:10.1007/s00382-004-0397-x, 2004.; Born, A. and Levermann, A.: The 8.2 ka event: abrupt transition of the subpolar gyre toward a modern North Atlantic circulation, Geochem. Geophy. Geosy., 11, Q06011, doi:10.1029/2009GC003024, 2010.; Eden, C. and Willebrand, J.: Mechanism of interannual to decadal variability of the North Atlantic circulation, J. Climate, 14, 2266–2280, 2001.; Born, A. and Mignot, J.: Dynamics of decadal variability in the Atlantic subpolar gyre: a stochastically forced oscillator, Clim. Dynam., 39, 461–474, doi:10.1007/s00382-011-1180-4, 2011.; Born, A., Nisancioglu, K. H., and Risebrobakken, B.: Late Eemian warming in the Nordic Seas as seen in proxy data and climate models, Paleoceanography, 26, PA2207, doi:10.1029/2010PA002027, 2011.; Born, A., Stocker, T. F., Raible, C. C., and Levermann, A.: Is the Atlantic subpolar gyre bistable in comprehensive coupled climate models?, Clim. Dynam., doi:10.1007/s00382-012-1525-7, 2012.; Danabasoglu, G., Ferrari, R., and McWilliams, J. C.: Sensitivity of an ocean general circulation model to a parameterization of near-surface eddy fluxes, J. Climate, 21, 1192–1208, doi:10.1175/2007JCLI1508.1, 2008.; Danabasoglu, G., Large, W. G., and Briegleb, B. P.: Climate impacts of parameterized Nordic Sea overflows, J. Geophys. Res., 115, C11005, doi:10.1029/2010JC006243, 2010.; Danabasoglu, G., Bates, S., Briegleb, B. P., Jayne, S. R., Jochum, M., Large, W. G., Peacock, S., and Yeager, S. G.: The CCSM4 ocean component, J. Climate, 25, 1361–1389, doi:10.1175/JCLI-D-11-00091.1, 2012{a}.; Danabasoglu, G., Yeager, S. G., Kwon, Y.-O., Tribbia, J. J., Phillips, A. S., and Hurrell, J. W.: Variability of the Atlantic meridional overturning circulation in CCSM4, J. Climate, 25, 5153–5172, doi:10.1175/JCLI-D-11-00463.1, 2012{b}.; Delworth, T. L. and Zeng, F.: Multicentennial variability of the Atlantic meridional overturning circulation and its climatic influence in a 4000 year simulation of the GFDL CM2.1 climate model, Geophys. Res. Lett., 39, L13702, doi:10.1029/2012GL052107, 2012.; Delworth, T. L., Manabe, S., and Stouffer, R. J.: Interdecadal variations of the thermohaline circulation in a coupled ocean-atmosphere model, J. Climate, 6, 1993–2011, 1993.; Desprès, A., Reverdin, G., and D'Ovidio, F.: Mechanisms

 

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