Links between tropical rainfall and North Atlantic climate during the last glacial period
| Type | Article | ||||||||
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| Date | 2013-03 | ||||||||
| Language | English | ||||||||
| Author(s) | Deplazes Gaudenz1, Lueckge Andreas2, Peterson Larry C.3, Timmermann Axel4, Hamann Yvonne1, Hughen Konrad A.5, Roehl Ursula6, Laj Carlo7, Cane Mark A.8, Sigman Daniel M.9, Haug Gerald H.1, 10 | ||||||||
| Affiliation(s) | 1 : ETH, Dept Earth Sci, Geol Inst, CH-8092 Zurich, Switzerland. 2 : Bundesanstalt Geowissensch & Rohstoffe, D-30655 Hannover, Germany. 3 : Univ Miami, Rosenstiel Sch Marine & Atmospher Sci, Miami, FL 33149 USA. 4 : Univ Hawaii, SOEST, IPRC, Honolulu, HI 96822 USA. 5 : Woods Hole Oceanog Inst, Dept Marine Chem & Geochem, Woods Hole, MA 02543 USA. 6 : Univ Bremen, MARUM Ctr Marine Environm Sci, D-28359 Bremen, Germany. 7 : CEA CNRS UVSQ, Lab Sci Climat & Environm IPSL, F-91198 Gif Sur Yvette, France. 8 : Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY 10964 USA. 9 : Princeton Univ, Dept Geosci, Princeton, NJ 08544 USA. 10 : Univ Potsdam, Inst Geosci, DFG Leibnitz Ctr Earth Surface Proc & Climate Stu, D-14476 Potsdam, Germany. |
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| Source | Nature Geoscience (1752-0894) (Nature Publishing Group), 2013-03 , Vol. 6 , N. 3 , P. 213-217 | ||||||||
| DOI | 10.1038/ngeo1712 | ||||||||
| WOS© Times Cited | 291 | ||||||||
| Note | Supplementary information is available in the online version of the paper. Reprints and permissions information is available online at www.nature.com/reprints. Correspondence and requests for materials should be addressed to G.D. or G.H.H. | ||||||||
| Abstract | During the last glacial period, the North Atlantic region experienced 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 events(1). Changes in Northern Hemisphere temperature, as recorded in Greenland(2-4), are thought to have affected the location of the Atlantic intertropical convergence zone(5,6) and the strength of the Indian summer monsoon(7,8). 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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