Solar forcing synchronizes decadal North Atlantic climate variability.

Thieblemont, Remi, Matthes, Katja , Omrani, Nour-Eddine, Kodera, Kunihiko and Hansen, Felicitas (2015) Solar forcing synchronizes decadal North Atlantic climate variability. Open Access Nature Communications, 6 (8268). DOI 10.1038/ncomms9268.

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Abstract

Quasi-decadal variability in solar irradiance has been suggested to exert a substantial effect on Earth’s regional climate. In the North Atlantic sector, the 11-year solar signal has been proposed to project onto a pattern resembling the North Atlantic Oscillation (NAO), with a lag of a few years due to ocean-atmosphere interactions. The solar/NAO relationship is, however, highly misrepresented in climate model simulations with realistic observed forcings. In addition, its detection is particularly complicated since NAO quasi-decadal fluctuations can be intrinsically generated by the coupled ocean-atmosphere system. Here we compare two multi-decadal ocean-atmosphere chemistry-climate simulations with and without solar forcing variability. While the experiment including solar variability simulates a 1–2-year lagged solar/NAO relationship, comparison of both experiments suggests that the 11-year solar cycle synchronizes quasi-decadal NAO variability intrinsic to the model. The synchronization is consistent with the downward propagation of the solar signal from the stratosphere to the surface.

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-TM Theory and Modeling
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.1038/ncomms9268
ISSN: 2041-1723
Projects: COST, NATHAN
Date Deposited: 02 Oct 2015 11:44
Last Modified: 12 Apr 2017 08:38
URI: http://oceanrep.geomar.de/id/eprint/29890

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