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- Title
Tracking abrupt climate change in the Southern Hemisphere: a seismic stratigraphic study of Lago Cardiel, Argentina (49°S).
- Authors
Gilli, Adrian; Anselmetti, Flavio S; Ariztegui, Daniel; Bradbury, J. Platt; Kelts, Kerry R; Markgraf, Vera; McKenzie, Judith A
- 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 (14 C). 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.
- Subjects
CARDIEL Lake (Argentina); ARGENTINA; STRATIGRAPHIC geology; PALEOSEISMOLOGY; CLIMATE change
- Publication
Terra Nova, 2001, Vol 13, Issue 6, p443
- ISSN
0954-4879
- Publication type
Article
- DOI
10.1046/j.1365-3121.2001.00377.x