Holocene palaeoclimates of southern Patagonia: Limnological and environmental history of Lago Cardiel, Argentina
Multiproxy palaeoenvironmental and palaeolimnological analyses of two Holocene-age sediment cores from the margin of Lago Cardiel, a 76 m deep, closed-basin lake in southern Patagonia (latitude 49°S), provide information on lake-level changes that can be related to regional palaeoclimate scenarios....
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_09596836_v13_n4_p581_Markgraf |
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todo:paper_09596836_v13_n4_p581_Markgraf2023-10-03T15:53:10Z Holocene palaeoclimates of southern Patagonia: Limnological and environmental history of Lago Cardiel, Argentina Markgraf, V. Bradbury, J.P. Schwalb, A. Burns, S.J. Stern, C. Ariztegui, D. Gilli, A. Anselmetti, F.S. Stine, S. Maidana, N. Argentina Environmental history Holocene Lago Cardiel Lake levels Multiproxy approach Palaeoclimates Palaeolimnology Patagonia South America Stormtracks Holocene lacustrine deposit lake level paleoclimate paleolimnology seasonal variation storm track Argentina Bacillariophyta Ostracoda Multiproxy palaeoenvironmental and palaeolimnological analyses of two Holocene-age sediment cores from the margin of Lago Cardiel, a 76 m deep, closed-basin lake in southern Patagonia (latitude 49°S), provide information on lake-level changes that can be related to regional palaeoclimate scenarios. Sedimentologic (magnetic susceptibility, organic and inorganic carbon content) and environmental indicators (pollen, diatoms, ostracodes and stable isotopes on ostracodes) show lake levels markedly higher than today during the early Holocene, following a rapid lake-level rise after a desiccation phase prior to 11 000 BP. After about 6000 BP, lake levels were generally lower, but underwent repeated fluctuations. These inferred changes support the previously proposed view that the southern westerly stormtracks were focused (zonal) north of latitude 50°S during the early Holocene, allowing for Antarctic cold fronts to bring easterly moisture to southern Patagonia, whereas during the late Holocene the stormtracks shifted seasonally, with an overall more meridional behaviour, resulting in less and more variable moisture at these latitudes. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09596836_v13_n4_p581_Markgraf |
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Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Argentina Environmental history Holocene Lago Cardiel Lake levels Multiproxy approach Palaeoclimates Palaeolimnology Patagonia South America Stormtracks Holocene lacustrine deposit lake level paleoclimate paleolimnology seasonal variation storm track Argentina Bacillariophyta Ostracoda |
| spellingShingle |
Argentina Environmental history Holocene Lago Cardiel Lake levels Multiproxy approach Palaeoclimates Palaeolimnology Patagonia South America Stormtracks Holocene lacustrine deposit lake level paleoclimate paleolimnology seasonal variation storm track Argentina Bacillariophyta Ostracoda Markgraf, V. Bradbury, J.P. Schwalb, A. Burns, S.J. Stern, C. Ariztegui, D. Gilli, A. Anselmetti, F.S. Stine, S. Maidana, N. Holocene palaeoclimates of southern Patagonia: Limnological and environmental history of Lago Cardiel, Argentina |
| topic_facet |
Argentina Environmental history Holocene Lago Cardiel Lake levels Multiproxy approach Palaeoclimates Palaeolimnology Patagonia South America Stormtracks Holocene lacustrine deposit lake level paleoclimate paleolimnology seasonal variation storm track Argentina Bacillariophyta Ostracoda |
| description |
Multiproxy palaeoenvironmental and palaeolimnological analyses of two Holocene-age sediment cores from the margin of Lago Cardiel, a 76 m deep, closed-basin lake in southern Patagonia (latitude 49°S), provide information on lake-level changes that can be related to regional palaeoclimate scenarios. Sedimentologic (magnetic susceptibility, organic and inorganic carbon content) and environmental indicators (pollen, diatoms, ostracodes and stable isotopes on ostracodes) show lake levels markedly higher than today during the early Holocene, following a rapid lake-level rise after a desiccation phase prior to 11 000 BP. After about 6000 BP, lake levels were generally lower, but underwent repeated fluctuations. These inferred changes support the previously proposed view that the southern westerly stormtracks were focused (zonal) north of latitude 50°S during the early Holocene, allowing for Antarctic cold fronts to bring easterly moisture to southern Patagonia, whereas during the late Holocene the stormtracks shifted seasonally, with an overall more meridional behaviour, resulting in less and more variable moisture at these latitudes. |
| format |
JOUR |
| author |
Markgraf, V. Bradbury, J.P. Schwalb, A. Burns, S.J. Stern, C. Ariztegui, D. Gilli, A. Anselmetti, F.S. Stine, S. Maidana, N. |
| author_facet |
Markgraf, V. Bradbury, J.P. Schwalb, A. Burns, S.J. Stern, C. Ariztegui, D. Gilli, A. Anselmetti, F.S. Stine, S. Maidana, N. |
| author_sort |
Markgraf, V. |
| title |
Holocene palaeoclimates of southern Patagonia: Limnological and environmental history of Lago Cardiel, Argentina |
| title_short |
Holocene palaeoclimates of southern Patagonia: Limnological and environmental history of Lago Cardiel, Argentina |
| title_full |
Holocene palaeoclimates of southern Patagonia: Limnological and environmental history of Lago Cardiel, Argentina |
| title_fullStr |
Holocene palaeoclimates of southern Patagonia: Limnological and environmental history of Lago Cardiel, Argentina |
| title_full_unstemmed |
Holocene palaeoclimates of southern Patagonia: Limnological and environmental history of Lago Cardiel, Argentina |
| title_sort |
holocene palaeoclimates of southern patagonia: limnological and environmental history of lago cardiel, argentina |
| url |
http://hdl.handle.net/20.500.12110/paper_09596836_v13_n4_p581_Markgraf |
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