Role of the Ocean in Maintaining the North-Atlantic Oscillation |
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| Authors: | A B Polonskii E P Semiletova G F Dzhiganshin |
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| Institution: | (1) Marine Climate Research, Marine Hydrophisical Institute of National, Academy of Sciences of Ukraine, 2 Kapitanskaya St., Sevastopol, Ukraine |
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| Abstract: | Based on the data on the sea-surface temperature (SST), the heat content of the upper 200-m layer, and the sea-level pressure, we analyze the low-frequency variability of the SST and heat content in the North Atlantic in 1950–1992 and the index of North-Atlantic Oscillation (NAO) in 1940–1995. It is confirmed that the role of the ocean and various mechanisms controlling the variability of SST changes for processes corresponding to different time scales (interannual, decadal, and interdecadal). It is shown that the interaction of tropical and subtropical latitudes is of principal importance on the interannual scale, the processes regulating the variability of subtropical gyre are important on the decadal scale, and the variations of the NAO with lower frequencies are controlled by the oceanic variability at high latitudes. We discuss possible feedbacks in the ocean–atmosphere system maintaining the NAO. |
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