Research on Glaciers
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The influence of
basal-ice characteristics on ice-sheet sedimentation |
Fieldwork in Greenland funded by The Royal Society
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Project Leader: |
Dr. Peter G. Knight
School of Earth Sciences and Geography
Keele University |
Funding: |
The Royal Society |
Grant title: |
Glacier sediments from basal ice |
Research team: |
P.G.Knight, Keele;
C.J. Patterson, Minnesota;
R.I.Waller, Greenwich and Keele;
A. Jones, Stirling and Liverpool;
Z.P.Robinson, Keele. |
This project was part of a long-running programme
of research on the basal ice at the margin of the Greenland ice sheet.
Funding for previous phases of the research had been provided by the Natural
Environment Research Council and the Royal Society. This section of te work,
funded by the Royal Society, was a pilot study to assess the potential for
using moraine sediments to reconstruct the characteristics of basal ice.
This pilot study was based on a field expedition to Greenland in September
1999. |
Project Aims and Background
Background
Since 1984 I have been involved in work that has shown how conditions
beneath an ice-sheet can be deduced by analysing the basal ice exposed
at the ice-sheet margin (e.g.: Knight, 1994). One of the justifications
for doing this work has been that, if the sedimentological characteristics
of the basal ice are preserved in sediments left behind after the ice sheet
retreats, then it will be possible to reconstruct former subglacial conditions
in previously glaciated areas such as the UK. There is much dispute as
to whether basal ice characteristics can generally be preserved postglacially,
but I have developed an environment-based model that predicts specific
geomorphic locations where basal ice signatures are most likely to survive.
The aim of this program is to test that model.
Aim of 1999 Research
I have been working at a site in Greenland where distinctive variations
in the debris content of basal ice occur over short distances due to topographic
disturbance of ice-flow (Knight et al 1994). There exist at the site many
intra-moraine locations where sediment released from the ice-front is trapped
in long-term sediment stores that are largely unaffected by local surface
water flow. Although the structural characteristics of basal ice are unlikely
to survive in a post-depositional context, the bulk characteristics of
sediment delivered to these locations are likely to be preserved. These
locations represent theoretically perfect sites for long-term preservation
of the basal-ice debris-signature: if preservation is at all possible,
it is in locations of this type that it will occur. The aim of this research
is to carry out a sedimentological exploration of sediment traps both close
to the ice margin and in moraine ridges of various ages in the proglacial
area, so as to establish whether the localised variations already recognised
in the characteristics of the ice are preserved as localised variations
in proglacial sediments.
References
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Knight, P.G. 1994: Two-facies interpretation of the basal ice layer
of the Greenland ice sheet contributes to a unified model of basal ice
formation. Geology, 22, 971-974.
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Knight, P.G., Sugden, D.E. and Minty, C. 1994: Ice flow around large
obstacles as indicated by basal ice exposed at the margin of the Greenland
ice sheet. Journal of Glaciology 40 (135), 359-367.
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The Field Area
North is up. Photo covers about 15km west-to-east.
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The field site is at the margin of the Greenland ice sheet near Kangerlussuaq,
about 35 miles north of the arctic circle and 100 miles from Greenland's
west coast. Observations of basal ice and moraine characteristics were
made around the margin of the Russell Glacier (left). This project stems
from several years of research at the site by the project leader. |
Fieldwork Report and Publications
Fieldwork Report
The project team conducted fieldwork during September 1999, operating
from a base camp at the margin of the Russell Glacier. Logistical
support was provided by helicopter and jeep charter from Kangerlussuaq.
The expedition successfully achieved the aims set out in the original
application. We collected data on recent changes in the position of a section
of the margin of the ice sheet, and correlated changes in the morphology
of the margin with changes in basal ice, in ice-marginal moraines,
and in sediment routing between the ice and the proglacial area.
We measured debris characteristics and deformation structures in basal
ice and in ice-marginal moraines, and we found that the sedimentological
characteristics of the basal ice can be preserved in the proglacial moraine.
We found that the diagnostic high clay and silt content of one particular
type of basal ice (the so-called 'dispersed facies') was reflected in the
sedimentology of moraines that were supplied by parts of the glacier that
contained this ice. We also found that sublimation of ice in winter conditions
permitted the preservation of stratigraphic features and tectonic structures
from the ice in the sediments that were left behind after ablation.
Publications arising directly from the 1999 field season:
Papers (follow
this link for abstracts etc.)
Knight, P.G., Patterson, C.J., Waller, R.I., Jones, A.P. and Robinson,
Z.P. (2000) Preservation of basal-ice sediment texture in ice
sheet moraines. QUATERNARY SCIENCE REVIEWS 19 (13), 1255-1258.
Knight, P.G., Waller, R.I., Patterson, C.J., Jones, A.P. and Robinson,
Z.P. (2000) Glacier advance, ice-marginal lakes and routing of meltwater
and sediment: Russell Glacier, Greenland. JOURNAL OF GLACIOLOGY 46
(154), 423-426.
Knight, P.G., Waller, R.I., Patterson, C.J., Jones, A.P. and Robinson,
Z.P. (2002) Discharge of debris from ice at the margin of the Greenland
ice sheet. JOURNAL OF GLACIOLOGY 48 (161), 192-198.
Knight, P.G., Jennings, C.E., Waller, R.I.. and Robinson, Z.P. (2007) Changes in ice-margin processes and sediment routing during ice-sheet advance across a marginal moraine. GEOGRAFISKA ANNALER (A) 89 (3) 203-215.
Conference publication
Knight, P. G., Patterson, C. J., and Waller, R. I. (2001) Changes
in sediment routing as a consequence of ice-sheet advance, Russell Glacier,
Greenland. American Geophysical Union Fall Meeting, San Francisco,
December 2001. EOS TRANS. AGU, 82 (47), Fall Meet. Suppl., Abstract.
The authors gratefully acknowledge the
support of the Royal Society in funding this research
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