Abstract
Variability of the hydrothermodynamic characteristics of the North Atlantic subpolar gyre on multidecadal scale is analyzed using ORA-S3 ocean re-analysis data for the period 1959–2011 and the COREv2 data for the period 1949–2006. It was shown that an increase in the outflow of heat from the ocean to the atmosphere since late 1990s in the Subtropical Atlantic was accompanied by a corresponding decrease in heat loss from the ocean surface in the Subpolar Atlantic. This is consistent with the Gulf Stream meridional displacement to the south in the warm phase of the Atlantic multidecadal oscillation (AMO). In the positive AMO phase, the depth of convective mixing at the Labrador Sea decreases, the sea surface height increases and cyclonicity in the subpolar gyre weakens from January to March. During these months, the response of the subpolar gyre circulation to long-term changes in the intensity of convective mixing at the Labrador Sea occurs with a 5–10 years delay.
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This study was supported by the Russian Scientific Foundation (grant 17-17-01295) and by the Russian Foundation for Basic Research (grant 18-05-01107).
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Diansky, N.A., Sukhonos, P.A. (2021). Multidecadal Variability of the Hydrothermodynamic Characteristics of the North Atlantic Subpolar Gyre. In: Chaplina, T. (eds) Processes in GeoMedia - Volume II. Springer Geology. Springer, Cham. https://doi.org/10.1007/978-3-030-53521-6_32
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