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Wind Forcing of Salinity Anomalies in the Denmark Strait Overflow : Volume 7, Issue 6 (30/11/2011)

By Hall, S.

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Book Id: WPLBN0004020549
Format Type: PDF Article :
File Size: Pages 14
Reproduction Date: 2015

Title: Wind Forcing of Salinity Anomalies in the Denmark Strait Overflow : Volume 7, Issue 6 (30/11/2011)  
Author: Hall, S.
Volume: Vol. 7, Issue 6
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Heywood, K. J., Wadley, M. R., Hall, S., & Dye, S. R. (2011). Wind Forcing of Salinity Anomalies in the Denmark Strait Overflow : Volume 7, Issue 6 (30/11/2011). Retrieved from

Description: School of Environmental Sciences, University of East Anglia, Norwich, UK. The overflow of dense water from the Nordic Seas to the North Atlantic through Denmark Strait is an important part of the global thermohaline circulation. The salinity of the overflow plume has been measured by an array of current meters across the continental slope off the coast of Angmagssalik, southeast Greenland since September 1998. During 2004 the salinity of the overflow plume changed dramatically; the entire width of the array (70 km) freshened between January 2004 and July 2004, with a significant negative salinity anomaly of about 0.06 in May. The event in May represents a fresh anomaly of over 3 standard deviations from the mean since recording began in 1998. The OCCAM 1/12° Ocean General Circulation Model not only reproduces the 2004 freshening event (r=0.96, p<0.01), but also correlates well with salinity observations over a previous 6 year period (r=0.54, p<0.01), despite the inevitable limitations of a z-coordinate model in representing the mixing processes at and downstream of the Denmark Strait sill. Consequently the physical processes causing the 2004 anomaly and prior variability in salinity are investigated using the model output. Our results reject the hypotheses that the anomaly is caused by processes occurring between the overflow sill and the moorings, or by an increase in upstream net freshwater input. Instead, we show that the 2004 salinity anomaly is caused by an increase in volume flux of low salinity water, with a potential density greater than 27.60 kg m−3, flowing towards the Denmark Strait sill in the East Greenland Current. This is caused by an increase in southward wind stress upstream of the sill at around 75° N 20° W four and a half months earlier, and an associated strengthening of the East Greenland Current.

Wind forcing of salinity anomalies in the Denmark Strait overflow

Aagaard, K. and Carmack, E.: The Role of Sea Ice and Other Fresh Water in Arctic Circulation, J. Geophys. Res., 94, 14485–14498, 1989.; Coward, A. and de Cuevas, B.: The OCCAM 66 Level Model: physics, initial conditions and external forcing, SOC Internal Report No. 99, National Oceanography Centre, Southampton, UK, 2005.; Curry, R., Dickson, B., and Yashayaev, I.: A change in the freshwater balance of the Atlantic Ocean over the past four decades, Nature, 426, 826–829, 2003.; Dickson, R. R. and Brown, J.: The production of North Atlantic Deep Water: Sources, rates and pathways, J. Geophys. Res., 99, 12319–12341, 1994.; Dickson R. R., Yashayaev, I., Meincke, J., Turrell, W. R., Dye, S. R., and Holfort, J.: Rapid Freshening of the Deep North Atlantic over the past Four Decades, Nature, 416, 832–837, 2002.; Dickson, R. R., Rudels, B., Dye, S., Karcher, M., Meincke, J., and Yashayaev, I.: Current estimates of freshwater flux through Arctic and subarctic seas, Prog. Oceanogr., 73, 210–230, 2007.; Dickson, R. R., Dye, S. R., Jónsson, S., Köhl, A., Macrander, A., Marnela, M., Meincke, J., Olsen, S., Rudels, B., Valdimarsson, H., and Voet, G.: The overflow flux west of Iceland: variability, origins and forcing, pages 443–474, in: Arctic Sub-Arctic Ocean fluxes: Defining the role of the Northern Seas in Climate, edited by: Dickson, R., Meincke, J., and Rhines, P., Springer, 734 pp., 443–474, doi:10.1007/978-1-4020-6774-7_20, 2008.; Fogelqvist, E., Blindheim, J., Tanhua, T., Østerhus, S., Buch, E., and Rey, F.: Greenland-Scotland overflow studied by hydro-chemical multivariate analysis, Deep-Sea Res. Pt. 1, 50, 73–102, 2003.; Hansen, B. and Østerhus, S.: North Atlantic – Nordic Seas exchanges, Prog. Oceanogr., 45, 109–208, 2000.; Harden, B., Renfrew, I., and Petersen, G.: A climatology of barrier winds off southeast Greenland, J. Clim., 24, 4701-�4717, doi:10.1175/2011JCLI4113.1, 2011.; Holfort, J. and Albrecht, T.: Atmospheric forcing of DSOW salinity, Ocean Science, 3, 411–416, 2007.; Holliday, N., Meyer, A., Bacon, S., Alderson, G., and de Cuevas, B.: Retroflection of part of the East Greenland Current at Cape Farewell, Geophys. Res. Lett., 34, L07609, doi:10.1029/2006GL029085, 2007.; Jónsson, S. and Valdimarsson, H.: A new path for the Denmark Strait overflow water from the Iceland Sea to Denmark Strait, Geophys. Res. Lett., 31, L03305, doi:10.1029/2003GL019214, 2004.; Köhl, A.: Variable source regions of Denmark Strait and Faroe Bank Channel overflow waters, Tellus A, 62, 551–569, 2010.; Kalnay, E., Kanamitsu, M., Kistler, R., Collins, W., Deaven, D., Gandin, L., Iredell, M., Saha, S., White, G., Woollen, J., Zhu, Y., Chelliah, M., Ebisuzaki, W., Higgins, W., Janowiak, J., Mo, K., Ropelewskia, C., Leetmaa, A., Reynolds, R., and Jenne, R.: The NCEP/NCAR reanalysis project, Bull. Amer. Meteor. Soc., 77, 437–495, 1996.; Mauritzen, C.: Production of dense overflow waters feeding the North Atlantic across the Greenland-Scotland Ridge, Part 1, Evidence for a revised circulation scheme, Deep-Sea Res. Pt. I, 43, 769–806, 1996.; Moore, G. W. K. and Renfrew, I.: Tip jets and barrier winds: A QuikSCAT climatology of high wind speed events around Greenland, J. Clim., 18, 3713–3725, 2005.; Pawlowicz, R., Beardsley, B., and Lentz, S.: Classical tidal harmonic analysis including error estimates in MATLAB using T TIDE, Comput. Geosci., 28, 929–937, 2002.; Peterson, B., McClelland, J., Curry, R., Holmes, R., Walsh, J., and Aagaard, K.: Trajectory Shifts in the Arctic and Subarctic Freshwater Cycle, Science, 313, 1061–1066, 2006.; Pickart, R., Straneo, F., and Moore, G. W. K.: Is Labrador Sea water formed in the Irminger Basin?, Deep-Sea Res. Pt. I, 50, 23–52, 2003.; Pickart, R., Torres, D., and Fratantoni, P.: The East Gree


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