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Evaluation of the heat balance constituents of the upper mixed layer in the North Atlantic

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Abstract

Different physical mechanisms which cause interannual and interdecadal temperature anomalies in the upper mixed layer (UML) of the North Atlantic are investigated using the data of ORA-S3 reanalysis for the period of 1959–2011. It is shown that the annual mean heat budget in UML is mainly caused by the balance between advective heat transfer and horizontal turbulent mixing (estimated as a residual term in the equation of thermal balance). The local UML temperature change and contribution from the heat fluxes on the lower boundary of the UML to the heat budget of the upper layer are insignificant for the time scale under consideration. The contribution of the heat fluxes on the upper UML boundary to the low-frequency variability of the upper layer temperature in the whole North Atlantic area is substantially less than 30%. Areas like the northwestern part of the Northern Subtropical Anticyclonic Gyre (NSAG), where their contribution exceeds 30–60%, are exceptions. The typical time scales of advective heat transfer variability are revealed. In the NSAG area, an interannual variability associated with the North Atlantic Oscillation dominates, while in the North Atlantic subpolar gyre, an interdecadal variability of advective transfers with periods of more than 30 years prevails.

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  1. Marine Hydrophysical Institute of Federal State Budgetary Scientific Institution “Institute of Natural and Technical Systems”, Sevastopol, 299011, Russia

    A. B. Polonsky & P. A. Sukhonos

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  1. A. B. Polonsky
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  2. P. A. Sukhonos
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Correspondence to A. B. Polonsky.

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Original Russian Text © A.B. Polonsky, P.A. Sukhonos, 2016, published in Izvestiya Rossiiskoi Akademii Nauk, Fizika Atmosfery i Okeana, 2016, Vol. 52, No. 6, pp. 729–739.

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Polonsky, A.B., Sukhonos, P.A. Evaluation of the heat balance constituents of the upper mixed layer in the North Atlantic. Izv. Atmos. Ocean. Phys. 52, 649–658 (2016). https://doi.org/10.1134/S0001433816060141

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