lgm and late glacial glacier advances in the cordillera real and cochabamba (bolivia) deduced from 10be surface exposure dating

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2007
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Abstract
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.
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veit2007climatelgm Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;H. Veit;P. W. Kubik;Ch. Kull;R. Zech
Journal proceedings - 16th ieee/acis international conference on computer and information science, icis 2017
Year 2007
DOI
DOI not found
URL
http://www.clim-past.net/3/623/2007/cp-3-623-2007.pdf
Keywords
environmental pollutionenvironmental protectionenvironmental sciences

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