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Raimund Muscheler

Raimund Muscheler

Professor

Raimund Muscheler

Causes and timing of the 8200 yr BP event inferred from the comparison of the GRIP Be-10 and the tree ring Delta C-14 record

Author

  • Raimund Muscheler
  • J Beer
  • M Vonmoos

Summary, in English

We analyse the 8200 yr BP cold event by comparing the high-resolution Be-10 record from the GRIP ice core from Central Greenland with the well-known tree ring Delta(14)C record. By transferring the absolute dated tree ring chronology to the ice core time scale, we show that the coldest phase in the GRIP record occurred around 8150 yr BP. Furthermore, this method allows us to disentangle production and climate effects on Be-10 and C-14 with important implications for the reconstruction of past solar activity, and changes in the carbon cycle and Be-10 transport. We show that, in principle, it is possible to infer changes in ocean circulation by comparing Be-10 and C-14 records. However, the duration of the 8200 yr BP event is too short to assign unambiguously a significant change in atmospheric C-14 concentration to changes in the global ocean circulation. Based on the comparison of Be-10 with climate records, one could argue that the 8200 yr BP cold event is triggered by a change towards lower solar activity. However, this link is questioned by the fact that around this period there are other similar and even stronger changes in solar activity that have no apparent connection to climate changes. (C) 2004 Elsevier Ltd. All rights reserved.

Department/s

  • Quaternary Sciences

Publishing year

2004

Language

English

Pages

2101-2111

Publication/Series

Quaternary Science Reviews

Volume

23

Issue

20-22

Document type

Journal article

Publisher

Elsevier

Topic

  • Geology

Status

Published

ISBN/ISSN/Other

  • ISSN: 0277-3791