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Atlantic Transport Variability at 25° N in Six Hydrographic Sections : Volume 8, Issue 4 (19/07/2012)

By Atkinson, C. P.

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Book Id: WPLBN0004020592
Format Type: PDF Article :
File Size: Pages 27
Reproduction Date: 2015

Title: Atlantic Transport Variability at 25° N in Six Hydrographic Sections : Volume 8, Issue 4 (19/07/2012)  
Author: Atkinson, C. P.
Volume: Vol. 8, Issue 4
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Bryden, H. L., Cunningham, S. A., King, B. A., & Atkinson, C. P. (2012). Atlantic Transport Variability at 25° N in Six Hydrographic Sections : Volume 8, Issue 4 (19/07/2012). Retrieved from http://www.worldlibrary.net/


Description
Description: National Oceanography Centre, European Way, Southampton, SO14 3ZH, UK. In January and February 2010, a sixth transatlantic hydrographic section was completed across 25° N, extending the hydrographic record at this latitude to over half a century. In combination with continuous transport measurements made since 2004 at 26.5° N by the Rapid-WATCH project, we reassess transport variability in the 25° N hydrographic record. Past studies of transport variability at this latitude have assumed transport estimates from each hydrographic section to represent annual average conditions. In this study the uncertainty in this assumption is assessed through use of Rapid-WATCH observations to quantify sub-seasonal and seasonal transport variability. Whilst in the upper-ocean no significant interannual or decadal transport variability are identified in the hydrographic record, in the deep ocean transport variability in both depth and potential temperature classes suggests some interannual or decadal variability may have occurred. This is particularly striking in the lower North Atlantic Deep Water where southward transports prior to 1998 were greater than recent transports by several Sverdrups. Whilst a cooling and freshening of Denmark Straits Overflow Water has occurred which is coincident with these transport changes, these water mass changes appear to be density compensated. Transport changes are the result of changing velocity shear in the vicinity of the Deep Western Boundary Current.

Summary
Atlantic transport variability at 25° N in six hydrographic sections

Excerpt
Atkinson, C. P.: Variability of the Atlantic Meridional Overturning Circulation at 26° N, Ph.D. thesis, School of Ocean and Earth Science, University of Southampton, Southampton, UK, 293 pp., 2011.; Bacon, S.: Decadal variability in the outflow from the Nordic seas to the deep Atlantic Ocean, Nature, 394, 871–874, 1998.; Atkinson, C. P., Bryden, H. L., Hirschi, J. J-M., and Kanzow, T.: On the seasonal cycles and variability of Florida Straits, Ekman and Sverdrup transports at 26° N in the Atlantic Ocean, Ocean Sci., 6, 837–859, doi:10.5194/os-6-837-2010, 2010.; Baringer, M. and Molinari, R.: Atlantic Ocean baroclinic heat flux at 24-26° N, Geophys. Res. Lett., 26, 353–356, 1999.; Bersch, M., Yashayaev, I., and Koltermann, K. P.: Recent changes of the thermohaline circulation in the subpolar North Atlantic, Ocean Dynam., 57, 223–235, doi:10.1007/s10236-007-0104-7, 2007.; Biastoch, A., Boening, C. W., 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, doi:10.1175/2008JCLI2404.1, 2008.; Bindoff, N. and McDougall, T.: Diagnosing climate-change and ocean ventilation using hydrographic data, J. Phys. Oceanogr., 24, 1137–1152, 1994.; Boening, C. W., 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, L21501, doi:10.1029/2006GL026906, 2006.; Bryden, H., Griffiths, M., Lavin, A., Millard, R., Parrilla, G., and Smethie, W.: Decadal changes in water mass characteristics at 24° N in the subtropical North Atlantic Ocean, J. Climate, 9, 3162–3186, 1996.; Bryden, H. L., Johns, W. E., and Saunders, P. M.: Deep western boundary current east of Abaco: Mean structure and transport, J. Mar. Res., 63, 35–57, 2005a.; Fine, R.: Tracers, time scales, and the thermohaline circulation – the lower-limb in the North-Atlantic Ocean, Rev. Geophys., 33, 1353–1365, 1995.; Bryden, H. L., Longworth, H. R., and Cunningham, S. A.: Slowing of the Atlantic Meridional Overturning Circulation at 25° N, Nature, 438, 655–657, doi:10.1038/nature04385, 2005b.; Bryden, H. L., Mujahid, A., Cunningham, S. A., and Kanzow, T.: Adjustment of the basin-scale circulation at 26° N to variations in Gulf Stream, deep western boundary current and Ekman transports as observed by the Rapid array, Ocean Sci., 5, 421–433, doi:10.5194/os-5-421-2009, 2009.; Chave, A., Luther, D., and Filloux, J.: Observations of the boundary current system at 26.5 degrees N in the subtropical North Atlantic ocean, J. Phys. Oceanogr., 27, 1827–1848, 1997.; Chidichimo, M. P., Kanzow, T., Cunningham, S. A., Johns, W. E., and Marotzke, J.: The contribution of eastern-boundary density variations to the Atlantic meridional overturning circulation at 26.5° N, Ocean Sci., 6, 475–490, doi:10.5194/os-6-475-2010, 2010.; Cunningham, S. A. and Alderson, S.: Transatlantic temperature and salinity changes at 24.5° N from 1957 to 2004, Geophys. Res. Lett., 34, L14606, doi:10.1029/2007GL029821, 2007.; Cunningham, S. A., Kanzow, T., Rayner, D., Baringer, M. O., Johns, W. E., Marotzke, J., Longworth, H. R., Grant, E. M., Hirschi, J. J. M., Beal, L. M., Meinen, C. S., and Bryden

 

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