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Early to Late Holocene Surface Exposure Ages From Two Marine‐Terminating Outlet Glaciers in Northwest Greenland

M. Reusche,S. Marcott,E. Ceperley,A. Barth,E. Brook,A. Mix,M. Caffee

Published 2018 in Geophysical Research Letters

ABSTRACT

Terrestrial chronologies from southern Greenland provide a detailed deglacial history of the Greenland Ice Sheet (GIS). The northern GIS margin history, however, is less established. Here we present surface exposure ages from moraines associated with two large outlet glaciers, Petermann and Humboldt, in the northwestern sector of the GIS. These moraine chronologies indicate a Little Ice Age advance of the ice sheet margin before ~0.3 ka and a possible equivalent advance of similar magnitude prior to ~2.8 ka. An early Holocene moraine at Humboldt Glacier was abandoned by 8.3 ± 1.7 ka and is contemporaneous with other moraines deposited along the entire western GIS margin. This widespread ice margin stability between ~9 and 8 ka indicates that while this margin was influenced by warming atmospheric temperatures during the early Holocene, the warming was likely overprinted with the effect of the abrupt climate cooling at 9.3 and 8.2 ka.

PUBLICATION RECORD

  • Publication year

    2018

  • Venue

    Geophysical Research Letters

  • Publication date

    2018-07-28

  • Fields of study

    Geology, Environmental Science

  • Identifiers
    DOI 10.1029/2018GL078266
  • External record

    Open on Semantic Scholar

  • Source metadata

    Semantic Scholar

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