Persistent link between solar activity and Greenland climate during the Last Glacial Maximum.

Adolphi, Florian, Muscheler, Raimund, Svensson, Anders, Aldahan, Ala, Possnert, Göran, Beer, Jürg, Sjolte, Jesper, Björck, Svante, Matthes, Katja and Thieblemont, Remi (2014) Persistent link between solar activity and Greenland climate during the Last Glacial Maximum. Nature Geoscience, 7 (9). pp. 662-666. DOI 10.1038/ngeo2225.

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Changes in solar activity have previously been proposed to cause decadal- to millennial-scale fluctuations in both the modern and Holocene climates1. Direct observational records of solar activity, such as sunspot numbers, exist for only the past few hundred years, so solar variability for earlier periods is typically reconstructed from measurements of cosmogenic radionuclides such as 10Be and 14C from ice cores and tree rings2, 3. Here we present a high-resolution 10Be record from the ice core collected from central Greenland by the Greenland Ice Core Project (GRIP). The record spans from 22,500 to 10,000 years ago, and is based on new and compiled data4, 5, 6. Using 14C records7, 8 to control for climate-related influences on 10Be deposition, we reconstruct centennial changes in solar activity. We find that during the Last Glacial Maximum, solar minima correlate with more negative δ18O values of ice and are accompanied by increased snow accumulation and sea-salt input over central Greenland. We suggest that solar minima could have induced changes in the stratosphere that favour the development of high-pressure blocking systems located to the south of Greenland, as has been found in observations and model simulations for recent climate9, 10. We conclude that the mechanism behind solar forcing of regional climate change may have been similar under both modern and Last Glacial Maximum climate conditions.

Document Type: Article
Additional Information: WOS:000341635600015
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
Refereed: Yes
Open Access Journal?: No
Publisher: Nature Publishing Group
Projects: Future Ocean
Date Deposited: 21 Aug 2014 11:59
Last Modified: 23 Sep 2019 21:47

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