Tracking abrupt climate change in the Southern Hemisphere: a seismic stratigraphic study of Lago Cardiel, Argentina (49°S) |
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| Authors: | Adrian Gilli Flavio S Anselmetti Daniel Ariztegui J Platt Bradbury Kerry R Kelts Vera Markgraf & Judith A McKenzie |
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| Institution: | Geological Institute, Swiss Federal Institute of Technology ETHZ, Sonneggstrasse 5, 8092 Zürich, Switzerland,;28551 Golden Gate Canyon Rd., Golden, CO 80403, USA,;Limnological Research Center, University of Minnesota, 220 Pillsbury Hall, 310 Pillsbury Dr SE, Minneapolis, MN 55455, USA,;Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO 80309–0450, USA |
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| Abstract: | Lake sediments from a closed basin in southern Patagonia (Argentina) provide a continental archive with which to reconstruct climate change and to test the interhemispheric synchroneity of abrupt events. High-resolution sub-bottom seismic profiles of Lago Cardiel indicate substantial lake-level changes since the late Pleistocene, which were identified and dated in a series of long piston cores. These data allow the reconstruction of the regional water balance at 49=" PSFT ? BC "202S since the late glacial. The seismic stratigraphy reveals a dry late glacial climate with a desiccation of the basin around 11 220 yr BP (14C). Lake level rapidly increased by 135 m at the Holocene transition. Following the early Holocene highstand at + 55 m, lake level never dropped significantly below modern level. The palaeoclimate changes implied by the Lago Cardiel record are out-of-phase with those implied by records from tropical South America and demonstrate considerable latitudinal asynchroneity in the climate evolution of this continent. |
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