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Conference Paper

The importance of the Irminger Gyre to the subpolar North Atlantic overturning on monthly timescales

Authors

Sanchez-Franks,  Alejandra
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Holliday,  Penny
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Evans,  Dafydd Gwyn
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Fried,  Nora
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Tooth,  Oliver
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Chafik,  Leon
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Fu,  Yao
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Li,  Feili
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

De Jong,  M. Femke
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Johnson,  Helen
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Sanchez-Franks, A., Holliday, P., Evans, D. G., Fried, N., Tooth, O., Chafik, L., Fu, Y., Li, F., De Jong, M. F., Johnson, H. (2023): The importance of the Irminger Gyre to the subpolar North Atlantic overturning on monthly timescales, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-0971


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016503
Abstract
The lower limb of the Atlantic meridional overturning circulation (AMOC) is the net equatorward flow of dense waters that have been transformed due to the cooling and freshening of the lighter, poleward-flowing, upper limb waters. In the subpolar North Atlantic (SPNA), upper limb variability is primarily set by the North Atlantic Current, whereas lower limb variability is less well understood, particularly at subseasonal timescales. Using observations from a SPNA mooring array between Greenland and Scotland, we show that variability of the AMOC’s lower limb is connected to poleward flow in the interior Irminger Sea. We identify this flow as the northward branch of the Irminger Gyre (IG), accounting for over 55% of the AMOC’s lower limb variability on monthly timescales. Increasing thickness of intermediate water within the Irminger Sea coincides with decreasing IG recirculation on interannual timescales. Wind stress curl fluctuations over the Labrador Sea, associated with the North Atlantic Oscillation, drive the IG on monthly timescales.