LGM and Late Glacial glacier advances in the Cordillera Real and Cochabamba (Bolivia) deduced from 10Be surface exposure dating
Surface exposure dating (SED) is an innovative tool already being widely applied for moraine dating and for Late Quaternary glacier and climate reconstruction. Here we present exposure ages of 28 boulders from the Cordillera Real and the Cordillera Cochabamba, Bolivia. Our results indicate that the...
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2007
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00032006 2023-05-15T17:33:20+02:00 LGM and Late Glacial glacier advances in the Cordillera Real and Cochabamba (Bolivia) deduced from 10Be surface exposure dating Zech, R. Kull, Ch. Kubik, P. W. Veit, H. 2007-10 electronic https://doi.org/10.5194/cp-3-623-2007 https://noa.gwlb.de/receive/cop_mods_00032006 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00031960/cp-3-623-2007.pdf https://cp.copernicus.org/articles/3/623/2007/cp-3-623-2007.pdf eng eng Copernicus Publications Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-3-623-2007 https://noa.gwlb.de/receive/cop_mods_00032006 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00031960/cp-3-623-2007.pdf https://cp.copernicus.org/articles/3/623/2007/cp-3-623-2007.pdf https://open-access.net/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2007 ftnonlinearchiv https://doi.org/10.5194/cp-3-623-2007 2022-02-08T22:46:27Z Surface exposure dating (SED) is an innovative tool already being widely applied for moraine dating and for Late Quaternary glacier and climate reconstruction. Here we present exposure ages of 28 boulders from the Cordillera Real and the Cordillera Cochabamba, Bolivia. Our results indicate that the local Last Glacial Maximum (LGM) in the Eastern Cordilleras occurred at ~22–25 ka and was thus synchronous to the global temperature minimum. We were also able to date several Late Glacial moraines to ~11–13 ka, which likely document lower temperatures and increased precipitation ("Coipasa" humid phase). Additionally, we recognize the existence of older Late Glacial moraines re-calculated to ~15 ka from published cosmogenic nuclide data. Those may coincide with the cold Heinrich 1 event in the North Atlantic region and the pronounced "Tauca" humid phase. We conclude that (i) exposure ages in the tropical Andes may have been overestimated so far due to methodological uncertainties, and (ii) although precipitation plays an important role for glacier mass balances in the tropical Andes, it becomes the dominant forcing for glaciation only in the drier and thus more precipitation-sensitive regions farther west and south. Article in Journal/Newspaper North Atlantic Niedersächsisches Online-Archiv NOA Climate of the Past 3 4 623 635 |
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article Verlagsveröffentlichung Zech, R. Kull, Ch. Kubik, P. W. Veit, H. LGM and Late Glacial glacier advances in the Cordillera Real and Cochabamba (Bolivia) deduced from 10Be surface exposure dating |
topic_facet |
article Verlagsveröffentlichung |
description |
Surface exposure dating (SED) is an innovative tool already being widely applied for moraine dating and for Late Quaternary glacier and climate reconstruction. Here we present exposure ages of 28 boulders from the Cordillera Real and the Cordillera Cochabamba, Bolivia. Our results indicate that the local Last Glacial Maximum (LGM) in the Eastern Cordilleras occurred at ~22–25 ka and was thus synchronous to the global temperature minimum. We were also able to date several Late Glacial moraines to ~11–13 ka, which likely document lower temperatures and increased precipitation ("Coipasa" humid phase). Additionally, we recognize the existence of older Late Glacial moraines re-calculated to ~15 ka from published cosmogenic nuclide data. Those may coincide with the cold Heinrich 1 event in the North Atlantic region and the pronounced "Tauca" humid phase. We conclude that (i) exposure ages in the tropical Andes may have been overestimated so far due to methodological uncertainties, and (ii) although precipitation plays an important role for glacier mass balances in the tropical Andes, it becomes the dominant forcing for glaciation only in the drier and thus more precipitation-sensitive regions farther west and south. |
format |
Article in Journal/Newspaper |
author |
Zech, R. Kull, Ch. Kubik, P. W. Veit, H. |
author_facet |
Zech, R. Kull, Ch. Kubik, P. W. Veit, H. |
author_sort |
Zech, R. |
title |
LGM and Late Glacial glacier advances in the Cordillera Real and Cochabamba (Bolivia) deduced from 10Be surface exposure dating |
title_short |
LGM and Late Glacial glacier advances in the Cordillera Real and Cochabamba (Bolivia) deduced from 10Be surface exposure dating |
title_full |
LGM and Late Glacial glacier advances in the Cordillera Real and Cochabamba (Bolivia) deduced from 10Be surface exposure dating |
title_fullStr |
LGM and Late Glacial glacier advances in the Cordillera Real and Cochabamba (Bolivia) deduced from 10Be surface exposure dating |
title_full_unstemmed |
LGM and Late Glacial glacier advances in the Cordillera Real and Cochabamba (Bolivia) deduced from 10Be surface exposure dating |
title_sort |
lgm and late glacial glacier advances in the cordillera real and cochabamba (bolivia) deduced from 10be surface exposure dating |
publisher |
Copernicus Publications |
publishDate |
2007 |
url |
https://doi.org/10.5194/cp-3-623-2007 https://noa.gwlb.de/receive/cop_mods_00032006 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00031960/cp-3-623-2007.pdf https://cp.copernicus.org/articles/3/623/2007/cp-3-623-2007.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-3-623-2007 https://noa.gwlb.de/receive/cop_mods_00032006 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00031960/cp-3-623-2007.pdf https://cp.copernicus.org/articles/3/623/2007/cp-3-623-2007.pdf |
op_rights |
https://open-access.net/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-3-623-2007 |
container_title |
Climate of the Past |
container_volume |
3 |
container_issue |
4 |
container_start_page |
623 |
op_container_end_page |
635 |
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1766131807225380864 |