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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/4588

Authors: Bellucci, A.*
Gualdi, S.*
Scoccimarro, E.*
Navarra, A.*
Title: NAO–ocean circulation interactions in a coupled general circulation model
Title of journal: Climate Dynamics
Series/Report no.: 7-8/31(2008)
Publisher: SPRINGER
Issue Date: Dec-2008
DOI: 10.1007/s00382-008-0408-4
Keywords: NAO
Ocean Dynamics
Abstract: The interplay between the North Atlantic Oscillation and the large scale ocean circulation is inspected in a 20th century simulation conducted with a state-of-the-art coupled general circulation model. Significant lead-lag covariance between oceanic and tropospheric variables suggests that the system supports a damped oscillatory mode involving an active ocean-atmosphere coupling, with a typical NAO-like space structure and a 5 years timescale, qualitatively consistent with a mid-latitude delayed oscillator paradigm. The two essential processes governing the oscillation are 1) a negative feedback between ocean gyre circulation and the high latitude SST meridional gradient and 2) a positive feedback between SST and the NAO. The atmospheric NAO pattern appears to have a weaker projection on the ocean meridional overturning, compared to the gyre circulation, which leads to a secondary role for the thermohaline circulation in driving the meridional heat transport, and thus the oscillatory mode.
Appears in Collections:01.01.02. Climate
Papers Published / Papers in press

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