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The influence of ice marginal setting on early Holocene retreat rates in central West Greenland

Journal Article · · Journal of Quaternary Science
DOI:https://doi.org/10.1002/jqs.2778· OSTI ID:1809155
 [1];  [2];  [3]
  1. Univ. of Buffalo, NY (United States). Geology Dept.; Univ. of Waterloo, ON (Canada). Earth and Environmental Sciences
  2. Univ. of Buffalo, NY (United States). Geology Dept.
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Center for AMS

Ice sheet reconstructions from diverse ice margin settings, spanning multiple millennia, are needed to assess the reaction of the Greenland Ice Sheet (GrIS) to millennial-scale climatic forcing and to place historical records in a longer-term context. Here we present 18 new cosmogenic 10Be exposure ages and five new radiocarbon ages that constrain the early Holocene retreat of the GrIS in the Disko Bugt region in both a marine and a land-based setting. Results indicate similar rates of early Holocene retreat of ~ 40–50 m a-1 from transects in Torsukattak fjord (marine setting) and the Naternaq area (land-based setting). We compile seven previously published chronologies of deglaciation from West Greenland, which yield early Holocene retreat rates ranging from 10 to 65 m a-1, similar to those determined for our two study areas. This work demonstrates that when averaged on millennial timescales, retreat rates were remarkably similar along the western GrIS margin. Furthermore, the retreat rates calculated here demonstrate that terrestrial sectors of ice sheets can retreat at net rates comparable to their marine counterparts.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1809155
Report Number(s):
LLNL-JRNL--665782; 787206
Journal Information:
Journal of Quaternary Science, Journal Name: Journal of Quaternary Science Journal Issue: 3 Vol. 30; ISSN 0267-8179
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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