Regional atmospheric circulation shifts induced by a grand solar minimum.

Martin-Puertas, Celia, Matthes, Katja , Brauer, Achim, Muscheler, Raimund, Hansen, Felicitas, Petrick, Christof, Aldahan, Ala, Possnert, Göran and van Geel, Bas (2012) Regional atmospheric circulation shifts induced by a grand solar minimum. Nature Geoscience, 5 (6). pp. 397-401. DOI 10.1038/ngeo1460.

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Large changes in solar ultraviolet radiation can indirectly affect climate1 by inducing atmospheric changes. Specifically, it has been suggested that centennial-scale climate variability during the Holocene epoch was controlled by the Sun2, 3. However, the amplitude of solar forcing is small when compared with the climatic effects and, without reliable data sets, it is unclear which feedback mechanisms could have amplified the forcing. Here we analyse annually laminated sediments of Lake Meerfelder Maar, Germany, to derive variations in wind strength and the rate of 10Be accumulation, a proxy for solar activity, from 3,300 to 2,000 years before present. We find a sharp increase in windiness and cosmogenic 10Be deposition 2,759  ±  39 varve years before present and a reduction in both entities 199  ±  9 annual layers later. We infer that the atmospheric circulation reacted abruptly and in phase with the solar minimum. A shift in atmospheric circulation in response to changes in solar activity is broadly consistent with atmospheric circulation patterns in long-term climate model simulations, and in reanalysis data that assimilate observations from recent solar minima into a climate model. We conclude that changes in atmospheric circulation amplified the solar signal and caused abrupt climate change about 2,800 years ago, coincident with a grand solar minimum.

Document Type: Article
Keywords: Atmospheric science; Climate science; Hydrology; hydrogeology; limnology; Geochemistry; Palaeoclimate; palaeoceanography
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1038/ngeo1460
ISSN: 1752-0894
Projects: Future Ocean
Date Deposited: 03 Aug 2012 08:10
Last Modified: 23 Sep 2019 18:03

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