Antarctic-like temperature variations in the Tropical Andes recorded by glaciers and lake levels during the last deglaciation
International audience The climatic reorganizations that occurred in the Southern and Northern hemispheres during the last deglaciation are thought to have affected the continental tropical regions. However, the respective impact of North and Southern climatic changes in the Tropics are still poorly...
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HAL CCSD
2021
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Online Access: | https://hal.science/hal-03964401 https://doi.org/10.5194/egusphere-egu21-12951 |
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ftcollegfrance:oai:HAL:hal-03964401v1 |
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Open Polar |
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Collège de France: HAL |
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English |
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[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
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[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Martin, Léo Blard, Pierre-Henri Lavé, Jérôme Jomelli, Vincent Lupker, Maarten Charreau, Julien Condom, Thomas Antarctic-like temperature variations in the Tropical Andes recorded by glaciers and lake levels during the last deglaciation |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The climatic reorganizations that occurred in the Southern and Northern hemispheres during the last deglaciation are thought to have affected the continental tropical regions. However, the respective impact of North and Southern climatic changes in the Tropics are still poorly understood. In the Norhtern Tropical Andes, moraines records indicate that the Antarctic Cold Reversal (ACR, 14.3-12.9 ka BP) stage was more represented than the Younger Dryas (12.9-11.7 ka BP) (Jomelli et al., 2014). However, further South, in the Altiplano basin (Bolivia), two cold periods of the North Hemisphere (Heinrich Stadial 1a (16.5-14.5 ka) and Younger Dryas) are synchronous with (i) major advances or stillstands of paleo-glaciers and with (ii) the highstands of the giant palaeo-lakes Tauca and Coipasa (Martin et al., 2018). Therefore, additional geochronological records of paleoglaciers fluctuations are necessary to address the respective impacts of North and South Hemisphere on the glacial dynamics in the region.We present new Cosmic Ray Exposure (CRE) ages from glacial landforms of the Bolivian Andes that extend pre-existing datasets for four different sites spreading from 16 to 21°S. We reconstruct the Equilibrium Line Altitudes (ELA) associated with each moraine with the AAR method and use them in an inverse algorithm that combines both the palaeo-glaciers and palaeo-lake budgets to derive temperature and precipitation reconstructions. Our temperature reconstruction (ΔT vs. Present) shows a consistent trend through the four glacial sites with a progressive warming from ΔT= -5°C (17 ka BP) to –2.5°C (15-14.5 ka BP, at the end of the Tauca highstand). This is followed by a return to colder conditions, around -4°C, during the ACR (15.5-12.9 ka BP). The Coipasa highstand is coeval with another warming trend followed by ΔT stabilization at the onset of the Holocene (circa 10 ka BP), around -3°C. Precipitation is mainly characterized by increases during the lake highstands, modulated by the distance from ... |
author2 |
University of Oslo (UiO) Centre de Recherches Pétrographiques et Géochimiques (CRPG) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS) Laboratoire de Glaciologie Bruxelles Université libre de Bruxelles (ULB) Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology Zürich (ETH Zürich) Observatoire des Sciences de l'Univers de Grenoble (OSUG ) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Conference Object |
author |
Martin, Léo Blard, Pierre-Henri Lavé, Jérôme Jomelli, Vincent Lupker, Maarten Charreau, Julien Condom, Thomas |
author_facet |
Martin, Léo Blard, Pierre-Henri Lavé, Jérôme Jomelli, Vincent Lupker, Maarten Charreau, Julien Condom, Thomas |
author_sort |
Martin, Léo |
title |
Antarctic-like temperature variations in the Tropical Andes recorded by glaciers and lake levels during the last deglaciation |
title_short |
Antarctic-like temperature variations in the Tropical Andes recorded by glaciers and lake levels during the last deglaciation |
title_full |
Antarctic-like temperature variations in the Tropical Andes recorded by glaciers and lake levels during the last deglaciation |
title_fullStr |
Antarctic-like temperature variations in the Tropical Andes recorded by glaciers and lake levels during the last deglaciation |
title_full_unstemmed |
Antarctic-like temperature variations in the Tropical Andes recorded by glaciers and lake levels during the last deglaciation |
title_sort |
antarctic-like temperature variations in the tropical andes recorded by glaciers and lake levels during the last deglaciation |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.science/hal-03964401 https://doi.org/10.5194/egusphere-egu21-12951 |
op_coverage |
Visio conference, Germany |
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ENVELOPE(9.642,9.642,63.170,63.170) ENVELOPE(163.917,163.917,-78.133,-78.133) |
geographic |
Antarctic The Antarctic Ela The Altiplano |
geographic_facet |
Antarctic The Antarctic Ela The Altiplano |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
EGU21 Virtual General Assembly 2021 https://hal.science/hal-03964401 EGU21 Virtual General Assembly 2021, Apr 2021, Visio conference, Germany. ⟨10.5194/egusphere-egu21-12951⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-egu21-12951 hal-03964401 https://hal.science/hal-03964401 doi:10.5194/egusphere-egu21-12951 |
op_doi |
https://doi.org/10.5194/egusphere-egu21-12951 |
_version_ |
1809822921230647296 |
spelling |
ftcollegfrance:oai:HAL:hal-03964401v1 2024-09-09T19:08:40+00:00 Antarctic-like temperature variations in the Tropical Andes recorded by glaciers and lake levels during the last deglaciation Martin, Léo Blard, Pierre-Henri Lavé, Jérôme Jomelli, Vincent Lupker, Maarten Charreau, Julien Condom, Thomas University of Oslo (UiO) Centre de Recherches Pétrographiques et Géochimiques (CRPG) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS) Laboratoire de Glaciologie Bruxelles Université libre de Bruxelles (ULB) Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology Zürich (ETH Zürich) Observatoire des Sciences de l'Univers de Grenoble (OSUG ) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Visio conference, Germany 2021-04-11 https://hal.science/hal-03964401 https://doi.org/10.5194/egusphere-egu21-12951 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-egu21-12951 hal-03964401 https://hal.science/hal-03964401 doi:10.5194/egusphere-egu21-12951 EGU21 Virtual General Assembly 2021 https://hal.science/hal-03964401 EGU21 Virtual General Assembly 2021, Apr 2021, Visio conference, Germany. ⟨10.5194/egusphere-egu21-12951⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/conferenceObject Conference papers 2021 ftcollegfrance https://doi.org/10.5194/egusphere-egu21-12951 2024-06-20T23:33:50Z International audience The climatic reorganizations that occurred in the Southern and Northern hemispheres during the last deglaciation are thought to have affected the continental tropical regions. However, the respective impact of North and Southern climatic changes in the Tropics are still poorly understood. In the Norhtern Tropical Andes, moraines records indicate that the Antarctic Cold Reversal (ACR, 14.3-12.9 ka BP) stage was more represented than the Younger Dryas (12.9-11.7 ka BP) (Jomelli et al., 2014). However, further South, in the Altiplano basin (Bolivia), two cold periods of the North Hemisphere (Heinrich Stadial 1a (16.5-14.5 ka) and Younger Dryas) are synchronous with (i) major advances or stillstands of paleo-glaciers and with (ii) the highstands of the giant palaeo-lakes Tauca and Coipasa (Martin et al., 2018). Therefore, additional geochronological records of paleoglaciers fluctuations are necessary to address the respective impacts of North and South Hemisphere on the glacial dynamics in the region.We present new Cosmic Ray Exposure (CRE) ages from glacial landforms of the Bolivian Andes that extend pre-existing datasets for four different sites spreading from 16 to 21°S. We reconstruct the Equilibrium Line Altitudes (ELA) associated with each moraine with the AAR method and use them in an inverse algorithm that combines both the palaeo-glaciers and palaeo-lake budgets to derive temperature and precipitation reconstructions. Our temperature reconstruction (ΔT vs. Present) shows a consistent trend through the four glacial sites with a progressive warming from ΔT= -5°C (17 ka BP) to –2.5°C (15-14.5 ka BP, at the end of the Tauca highstand). This is followed by a return to colder conditions, around -4°C, during the ACR (15.5-12.9 ka BP). The Coipasa highstand is coeval with another warming trend followed by ΔT stabilization at the onset of the Holocene (circa 10 ka BP), around -3°C. Precipitation is mainly characterized by increases during the lake highstands, modulated by the distance from ... Conference Object Antarc* Antarctic Collège de France: HAL Antarctic The Antarctic Ela ENVELOPE(9.642,9.642,63.170,63.170) The Altiplano ENVELOPE(163.917,163.917,-78.133,-78.133) |