Tracking abrupt climate change in the Southern hemisphere: A seismic stratigraphic study of Lago Cardiel, Argentina (49°S)

Judith A. McKenzie, Flavio S. Anselmetti, Adrian Gilli, J. Platt Bradbury, Vera Markgraf

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65 Scopus citations

Abstract

Lake sediments from a closed basin in southern Patagonia (Argentina) provide a continental archive with 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'S 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.

Original languageEnglish (US)
Pages (from-to)443-448
Number of pages6
JournalTerra Nova
Volume13
Issue number6
DOIs
StatePublished - Dec 1 2001

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Copyright 2017 Elsevier B.V., All rights reserved.

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