Sixty years of ice form and flow at Camp Century, Greenland
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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Sixty years of ice form and flow at Camp Century, Greenland. / Colgan, William; Jakobsen, Jakob; Solgaard, Anne; Lokkegaard, Anja; Abermann, Jakob; Khan, Shfaqat A.; Csatho, Beata; MacGregor, Joseph A.; Fausto, Robert S.; Karlsson, Nanna; Pedersen, Allan o.; Andersen, Signe B.; Sonntag, John; Hvidberg, Christine S.; Ahlstrom, Andreas P.
I: Journal of Glaciology, Bind 69, Nr. 276, 02.08.2023, s. 919-929.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Sixty years of ice form and flow at Camp Century, Greenland
AU - Colgan, William
AU - Jakobsen, Jakob
AU - Solgaard, Anne
AU - Lokkegaard, Anja
AU - Abermann, Jakob
AU - Khan, Shfaqat A.
AU - Csatho, Beata
AU - MacGregor, Joseph A.
AU - Fausto, Robert S.
AU - Karlsson, Nanna
AU - Pedersen, Allan o.
AU - Andersen, Signe B.
AU - Sonntag, John
AU - Hvidberg, Christine S.
AU - Ahlstrom, Andreas P.
PY - 2023/8/2
Y1 - 2023/8/2
N2 - 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 degrees. 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.
AB - 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 degrees. 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.
KW - Ice dynamics
KW - ice velocity
KW - laser altimetry
KW - MASS-BALANCE
KW - SHEET
KW - ACCUMULATION
KW - ELEVATION
KW - PROGRAM
KW - TEMPERATURE
KW - VELOCITY
U2 - 10.1017/jog.2022.112
DO - 10.1017/jog.2022.112
M3 - Journal article
VL - 69
SP - 919
EP - 929
JO - Journal of Glaciology
JF - Journal of Glaciology
SN - 0022-1430
IS - 276
ER -
ID: 330777428