Abstract
During the last glacial period, the North Atlantic regionexperienced pronounced, millennial-scale alternations between cold, stadial conditions and milder interstadial conditions—commonly referred to as Dansgaard–Oeschger oscillations—as well as periods of massive iceberg discharge known as Heinrich events1. Changes in Northern Hemisphere temperature, as recorded in Greenland2,3,4, are thought to have affected the location of the Atlantic intertropical convergence zone5,6 and the strength of the Indian summer monsoon7,8. Here we use high-resolution records of sediment colour—a measure of terrigenous versus biogenic content—from the Cariaco Basin off the coast of Venezuela and the Arabian Sea to assess teleconnections with the North Atlantic climate system during the last glacial period. The Cariaco record indicates that the intertropical convergence zone migrated seasonally over the site during mild stadial conditions, but was permanently displaced south of the basin during peak stadials and Heinrich events. In the Arabian Sea, we find evidence of a weak Indian summer monsoon during the stadial events. The tropical records show a more variable response to North Atlantic cooling than the Greenland temperature records. We therefore suggest that Greenland climate is especially sensitive to variations in the North Atlantic system—in particular sea-ice extent—whereas the intertropical convergence zone and Indian monsoon system respond primarily to variations in mean Northern Hemisphere temperature.
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Acknowledgements
We thank the RV Marion Dufresne team, IPEV and the IMAGES programme for retrieving the Cariaco Basin cores during the PICASSO cruise. We are grateful to I. Hajdas and P. M. Grootes for performing the AMS 14C measurements. This work was supported by the Deutsche Forschungsgemeinschaft (DFG) and the US National Science Foundation (NSF).
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G.D. performed the reflectance analyses, interpreted the data and wrote the first version of the manuscript. A.L., L.C.P., C.L. and G.H.H. designed the study and helped organize the coring campaigns. Y.H. and U.R. supervised taking the pictures at the ETH Zürich and the MARUM, University of Bremen. A.T. analysed the water-hosing simulation. D.M.S and M.A.C. contributed to the interpretation of the data. All the authors discussed the results and provided significant input to the final manuscript.
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Deplazes, G., Lückge, A., Peterson, L. et al. Links between tropical rainfall and North Atlantic climate during the last glacial period. Nature Geosci 6, 213–217 (2013). https://doi.org/10.1038/ngeo1712
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DOI: https://doi.org/10.1038/ngeo1712
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