Structure, transports and transformations of the water masses in the Atlantic Subpolar Gyre

作者: Maribel I. García-Ibáñez , Paula C. Pardo , Lidia I. Carracedo , Herlé Mercier , Pascale Lherminier

DOI: 10.1016/J.POCEAN.2015.03.009

关键词: North Atlantic Deep WaterRidge (meteorology)Subarctic climateOcean gyreCircumpolar deep waterOceanographyGeologyMode waterWater massLabrador Sea Water

摘要: We discuss the distributions and transports of main water masses in North Atlantic Subpolar Gyre (NASPG) for mean period 2002–2010 (OVIDE sections every other year), as well inter-annual variability mass structure from 1997 (4x METEOR sections) to 2010. The NASPG, quantitatively assessed by means an Optimum MultiParameter analysis (with 14 masses), was combined with velocity fields resulting previous studies using inverse models obtain volume transports. also evaluate relative contribution Meridional Overturning Circulation (AMOC) characterizing identifying that contribute AMOC variability. reduction magnitude upper limb between 2000s is associated northward transport Central Waters. This flow partially compensated southward lower AMOC, decrease Polar Intermediate Water Mode (SPMW) Irminger Basin. decompose over Reykjanes Ridge East Basin (9.4 ± 4.7 Sv) into contributions Waters (2.1 1.8 Sv), Labrador Sea (LSW, 2.4 2.0 Subarctic (SAIW, 4.0 0.5 Iceland–Scotland Overflow (ISOW, 0.9 Sv). Once LSW ISOW cross Ridge, favoured strong mixing around it, they leave through deep-to-bottom levels. results give insights transformations within such SAIW formation different varieties SPMW due air–sea interaction.

参考文章(124)
Andreas Macrander, Uwe Send, H Valdimarsson, Steing Jónsson, Rolf H Käse, None, Interannual changes in the overflow from the Nordic Seas into the Atlantic Ocean through Denmark Strait Geophysical Research Letters. ,vol. 32, ,(2005) , 10.1029/2004GL021463
Marcus Dengler, Jürgen Fischer, Friedrich A. Schott, Rainer Zantopp, Deep Labrador Current and its variability in 1996–2005 Geophysical Research Letters. ,vol. 33, ,(2006) , 10.1029/2006GL026702
Charles L. Lawson, Richard J. Hanson, Solving Least Squares Problems ,(1974)
M. Rhein, J. Fischer, W. M. Smethie, D. Smythe-Wright, R. F. Weiss, C. Mertens, D.-H. Min, U. Fleischmann, A. Putzka, Labrador Sea Water: Pathways, CFC Inventory, and Formation Rates Journal of Physical Oceanography. ,vol. 32, pp. 648- 665 ,(2002) , 10.1175/1520-0485(2002)032<0648:LSWPCI>2.0.CO;2
Manfred Bersch, Jens Meincke, Alexander Sy, Interannual thermohaline changes in the northern North Atlantic 1991–1996 Deep-sea Research Part Ii-topical Studies in Oceanography. ,vol. 46, pp. 55- 75 ,(1999) , 10.1016/S0967-0645(98)00114-3
Matthias Tomczak, Daniel G. B. Large, Optimum multiparameter analysis of mixing in the thermocline of the eastern Indian Ocean Journal of Geophysical Research. ,vol. 94, pp. 16141- 16149 ,(1989) , 10.1029/JC094IC11P16141
John Lazier, Ross Hendry, Allyn Clarke, Igor Yashayaev, Peter Rhines, Convection and restratification in the Labrador Sea, 1990-2000 Deep Sea Research Part I: Oceanographic Research Papers. ,vol. 49, pp. 1819- 1835 ,(2002) , 10.1016/S0967-0637(02)00064-X
Bruno Ferron, Florian Kokoszka, Herlé Mercier, Pascale Lherminier, Dissipation Rate Estimates from Microstructure and Finescale Internal Wave Observations along the A25 Greenland–Portugal OVIDE Line Journal of Atmospheric and Oceanic Technology. ,vol. 31, pp. 2530- 2543 ,(2014) , 10.1175/JTECH-D-14-00036.1