Sixty years of ice form and flow at Camp Century, Greenland

William Colgan, Jakob Jakobsen, Anne Solgaard, Anja Løkkegaard, Jakob Abermann, Shfaqat A. Khan, Beata Csatho, Joseph A. MacGregor, Robert S. Fausto, Nanna Karlsson, Allan Ø. Pedersen, Signe B. Andersen, John Sonntag, Christine S. Hvidberg, Andreas P. Ahlstrom

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

Resumé

The magnitude and azimuth of horizontal ice flow at Camp Century, Greenland have been measured several times since 1963. Here, we provide a further two independent measurements over the 2017-21 period. Our consensus estimate of horizontal ice flow from four independent satellite-positioning solutions is 3.65 ± 0.13 m a-1 at an azimuth of 236 ± 2°. A portion of the small, but significant, differences in ice velocity and azimuth reported between studies likely results from spatial gradients in ice flow. This highlights the importance of restricting inter-study comparisons of ice flow estimates to measurements surveyed within a horizontal distance of one ice thickness from each other. We suggest that ice flow at Camp Century is stable on seasonal to multi-decadal timescales. The airborne and satellite laser altimetry record indicates an ice thickening trend of 1.1 ± 0.3 cm a-1 since 1994. This thickening trend is qualitatively consistent with previously inferred ongoing millennial-scale ice thickening at Camp Century. The ice flow divide immediately north of Camp Century may now be migrating southward, although the reasons for this divide migration are poorly understood. The Camp Century flowlines presently terminate in the vicinity of Innaqqissorsuup Oqquani Sermeq (Gade Gletsjer) on the Melville Bay coast.

OriginalsprogEngelsk
Sider (fra-til)919-929
Antal sider11
TidsskriftJournal of Glaciology
Vol/bind69
Udgave nummer276
DOI
StatusUdgivet - 7 aug. 2023

Programområde

  • Programområde 5: Natur og klima

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