Andresen, Camilla S (2012): Mean sand flux in cores ER11, ER07 and ER13, Sermilik Fjord, Greenland [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.786791
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Abstract:
During the early 2000s the Greenland Ice Sheet experienced the largest ice-mass loss of the instrumental record, largely as a result of the acceleration, thinning and retreat of large outlet glaciers in West and southeast Greenland. The quasi-simultaneous change in the glaciers suggests a common climate forcing. Increasing air and ocean temperatures have been indicated as potential triggers. Here, we present a record of calving activity of Helheim Glacier, East Greenland, that extends back to about AD 1890, based on an analysis of sedimentary deposits from Sermilik Fjord, where Helheim Glacier terminates. Specifically, we use the annual deposition of and grains as a proxy for iceberg discharge. Our record reveals large fluctuations in calving rates, but the present high rate was reproduced only in the 1930s. A comparison with climate indices indicates that high calving activity coincides with a relatively strong influence of Atlantic water and a lower influence of polar water on the shelf off Greenland, as well as with warm summers and the negative phase of the North Atlantic Oscillation. Our analysis provides evidence that Helheim Glacier responds to short-term fluctuations of large-scale oceanic and atmospheric conditions, on timescales of 3-10 years.
Related to:
Andresen, Camilla S; Straneo, Fiammetta; Ribergaard, Mads Hvid; Andersen, Thorbjørn Joest; Kuijpers, Antoon; Nørgaard-Pedersen, Niels; Kjær, Kurt Henrik; Schjøth, Frands; Weckström, Kaarina; Ahlstrøm, Andreas P (2012): Rapid response of Helheim Glacier in Greenland to climate variability over the past century. Nature Geoscience, 5, 37-41, https://doi.org/10.1038/ngeo1349
Project(s):
Climate Change: Learning from the past climate (Past4Future)
Funding:
Seventh Framework Programme (FP7), grant/award no. 243908: Climate Change: Learning from the past climate
Coverage:
Latitude: 66.012700 * Longitude: -37.860400
Minimum Elevation: -595.0 m * Maximum Elevation: -595.0 m
Event(s):
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Year of deposition | Deposition | a AD | Andresen, Camilla S | High resolution, low background gamma spectroscopy (HPGe detector, Canberra Inc.) | |
| 2 | Sand, flux, mean, per year | Sand flux | g/m2/a | Andresen, Camilla S | Grain size, Mastersizer 2000, Malvern Instrument Inc. |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
196 data points