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The Role of Subpolar Deep Water Formation and Nordic Seas Overflows in Simulated Multidecadal Variability of the Atlantic Overturning : Volume 10, Issue 5 (30/10/2013)

By Lohmann, K.

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Book Id: WPLBN0004020724
Format Type: PDF Article :
File Size: Pages 37
Reproduction Date: 2015

Title: The Role of Subpolar Deep Water Formation and Nordic Seas Overflows in Simulated Multidecadal Variability of the Atlantic Overturning : Volume 10, Issue 5 (30/10/2013)  
Author: Lohmann, K.
Volume: Vol. 10, Issue 5
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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Jungclaus, J. H., Mignot, J., Lorenz, S., Langehaug, H. R., Park, W., Otterå, O. H.,...Gao, Y. (2013). The Role of Subpolar Deep Water Formation and Nordic Seas Overflows in Simulated Multidecadal Variability of the Atlantic Overturning : Volume 10, Issue 5 (30/10/2013). Retrieved from http://worldpubliclibrary.org/


Description
Description: Max Planck Institute for Meteorology, Hamburg, Germany. We investigate the respective role of variations in subpolar deep water formation and Nordic Seas overflows for the decadal to multidecadal variability of the Atlantic meridional overturning circulation (AMOC). This is done by analysing long (order of 1000 yr) control simulations with five coupled climate models as well as sensitivity experiments performed with one of the models, in which we suppress the variability of either subpolar deep water formation or Nordic Seas overflows. For all models, the maximum influence of variations in subpolar deep water formation is found at about 45° N, while the maximum influence of variations in Nordic Seas overflows is rather found at 55° N to 60° N. Regarding the two overflow branches, the influence of variations in the Denmark Strait overflow is, for all models, substantially larger than that of variations in the overflow across the Iceland–Scotland–Ridge. The influence of variations in subpolar deep water formation is, on multi-model average, larger than that of variations in the Denmark Strait overflow. This is true both at 45° N, where the maximum standard deviation of decadal to multidecadal AMOC variability is located for all but one model, and at the more classical latitude of 30° N. At 30° N, variations in subpolar deep water formation and Denmark Strait overflow explain, on multi-model average, about half and one third respectively of the decadal to multidecadal AMOC variance.

Summary
The role of subpolar deep water formation and Nordic Seas overflows in simulated multidecadal variability of the Atlantic overturning

Excerpt
Ba, J., Keenlyside, N., Park, W., Latif, M., Hawkins, E., and Ding, H.: A mechanism for Atlantic multidecadal variability in the Kiel Climate Model, Clim. Dynam., 41, 2133–2144, doi:10.1007/s00382-012-1633-4, 2013.; Ba, J., Keenlyside, N., Latif, M., Park, W., Ding, H., Lohmann, K., Mignot, J., Menary, M., Otterå, O. H., Wouters, B., Salas, D., Oka, A., Belluci, A., and Volodin, E.: A multi-model comparison for Atlantic multidecadal variability, Clim. Dynam, in reviev, 2013.; Bailey, D., Rhines, P., and Häkkinen, S.: Formation and pathways of north atlantic deep water in a coupled ice–ocean model of the arctic-north atlantic oceans, Clim. Dynam., 25, 497–516, 2005.; Bentsen, M., Drange, H., Furevik, T., and Zhou, T.: Simulated variability of the Atlantic meridional overturning circulation, Clim. Dynam., 22, 701–720, 2004.; Biastoch, A., Böning, C., Getzlaff, J., Molines, J.-M., and Madec, G.: Causes of interannual–decadal variability in the meridional overturning circulation of the midlatitude North Atlantic Ocean, J. Climate, 21, 6599–6615, 2008.; Böning, C., Scheinert, M., Dengg, J., Biastoch, A., and Funk, A.: Decadal variability of subpolar gyre transport and its reverberation in the North Atlantic overturning, Geophys. Res. Lett., 33, L21S01, doi:10.1029/2006GL026906, 2006.; Cunningham, S.,, Kanzow, T., Rayner, D., Baringe, M. O.r, Johns, W. E., Marotzke, J., Longworth, H. R., Grant, E. M., Hirschi, J. J.-M., Beal, L. M., Meinen, C. S., and Bryden, H. L.: Temporal variability of the atlantic meridional overturning circulation at 26.5° N, Science, 317, 935–938, 2007.; 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.; Escudier, R., Mignot, J., and Swingedouw, D.: A 20-yrs coupled ocean-sea ice-atmosphere variability mode in the North Atlantic in an AOGCM, Clim. Dynam., 40, 619–636, doi:10.1007/s00382-012-1402-4, 2013.; Msadek, R. and Frankignoul, C.: Atlantic multidecadal oceanic variability and its influence on the atmosphere in a climate model, Clim. Dynam., 33, 45–62, 2009.; Olsen, S. M., Hansen, B., Quadfasel, D., and Østerhus, S.: Observed and modeled stability of overflow across the Greenland–Scotland ridge, Nature, 455, 519–523, 2008.; Fischer, N.: Holocene and Eemian climate variability, Ph.D. thesis, Berichte zur Erdsystemforschung No. 91, Max Planck Institute for Meteorology, Hamburg, Germany, 106 pp., 2011.; Furevik, T., Bentsen, M., Drange, H., Kindem, I., Kvamstø, N., and Sorteberg, A.: Description and evaluation of the Bergen climate model: ARPEGE coupled with MICOM, Clim. Dynam., 21, 27–51, 2003.; Gastineau, G. and Frankignoul, C.: Cold-season atmospheric response to the natural variability of the Atlantic meridional overturning circulation, Clim. Dynam., 39, 37–57, 2012.; Gordon, C., Cooper, C., Senior, C., Banks, H., Gregory, J., Johns, T., Mitchell, J., and Wood, R.: The simulation of SST, sea ice extents and ocean heat transports in a version of the Hadley Centre coupled model without flux adjustments, Clim. Dynam., 16, 147–168, 2000.; Hall, M. and Bryden, H.: Direct estimates and mechanisms of ocean heat transport, Deep-Sea Res., 29, 339–359, 1982.; Hansen, B., Østerhus, S., Turrell, B., Jónsson, S., Valdimarsson, H., Hátún, H., and Olsen, S.: The inflow of Atlantic water, heat, and salt to the Nordic Seas across the Greenland–Scotland Ridge, in: Arctic–Subarctic Ocean Fluxes, edited by: Dickson, R., Meincke, J., and Rhines, P., Springer Verlag, 15–43, 2008.; Jungclaus, J. H., Haak, H., Latif, M., and Mikolajewicz, U.: Arctic–North Atlantic interactions and multidecadal variability of the meridional overturning circulation, J.

 

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