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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fttriple:oai:gotriple.eu:10670/1.y9c2ei 2023-05-15T17:33:31+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. 2018-09-27 https://doi.org/10.5194/cp-3-623-2007 https://cp.copernicus.org/articles/3/623/2007/ en eng doi:10.5194/cp-3-623-2007 10670/1.y9c2ei https://cp.copernicus.org/articles/3/623/2007/ undefined Geographica Helvetica - geography eISSN: 1814-9332 envir geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ 2018 fttriple https://doi.org/10.5194/cp-3-623-2007 2023-01-22T16:32:30Z 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. Text North Atlantic Unknown Climate of the Past 3 4 623 635 |
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envir geo 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 |
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envir geo |
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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 |
Text |
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 |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-3-623-2007 https://cp.copernicus.org/articles/3/623/2007/ |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Geographica Helvetica - geography eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-3-623-2007 10670/1.y9c2ei https://cp.copernicus.org/articles/3/623/2007/ |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-3-623-2007 |
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Climate of the Past |
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3 |
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4 |
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623 |
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635 |
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1766132053626060800 |