Articles | Volume 16, issue 5
Research article
18 Sep 2020
Research article |  | 18 Sep 2020

Can the boundary profiles at 26° N be used to extract buoyancy-forced Atlantic Meridional Overturning Circulation signals?

Irene Polo, Keith Haines, Jon Robson, and Christopher Thomas

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Cited articles

Balan Sarojini, B., Gregory, J. M., Tailleux, R., Bigg, G. R., Blaker, A. T., Cameron, D. R., Edwards, N. R., Megann, A. P., Shaffrey, L. C., and Sinha, B.: High frequency variability of the Atlantic meridional overturning circulation, Ocean Sci., 7, 471–486,, 2011. 
Balmaseda, M. A., Mogensen, K., and Weaver, A. T.: Evaluation of the ECMWF ocean reanalysis system ORAS4, Q. J. Roy. Meteor. Soc., 139, 1132–1161, 2013. 
Biastoch, A., Boning, 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,, 2008. 
Bitz, C. M. and Lipscomb, W. H.: An energy-conserving thermodynamic model of sea ice, J. Geophys. Res.-Oceans, 104, 15669–15677,, 1999. 
Blake, A. T., Hirschi, J. M., McCarthy, G., Sinha, B., Taws, S., Marsh, R., Coward, A., and de Cuevas, B.: Historical analogues of the recent extreme minima observed in the Atlantic meridional overturning circulation at 26 N, Clim. Dynam., 22, 457–473,, 2015. 
Short summary
AMOC variability controls climate and is driven by wind and buoyancy forcing in the Atlantic. Density changes there are expected to connect to tropical regions. We develop methods to identify boundary density profiles at 26° N which relate to the AMOC. We found that density anomalies propagate equatorward along the western boundary, eastward along the Equator and then poleward up the eastern boundary with 2 years lag between boundaries. Record lengths of more than 26 years are required.