Anschütz, Helgard; Sinisalo, A; Isaksson, Elisabeth; McConnell, Joseph R; Hamran, S E; Bisiaux, Marion M; Pasteris, Daniel R; Neumann, T A; Winther, Jan-Gunnar (2011): Snow depths of volcanic events and accumulation rates of firn cores from the IPY traverse, Antarctica [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.806997, Supplement to: Anschütz, H et al. (2011): Variation of accumulation rates over the last eight centuries on the East Antarctic Plateau derived from volcanic signals in ice cores. Journal of Geophysical Research: Atmospheres, 116(D20), D20103, https://doi.org/10.1029/2011JD015753
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Abstract:
Volcanic signatures in ice-core records provide an excellent means to date the cores and obtain information about accumulation rates. From several ice cores it is thus possible to extract a spatio-temporal accumulation pattern. We show records of electrical conductivity and sulfur from 13 firn cores from the Norwegian-USA scientific traverse during the International Polar Year 2007-2009 (IPY) through East Antarctica. Major volcanic eruptions are identified and used to assess century-scale accumulation changes. The largest changes seem to occur in the most recent decades with accumulation over the period 1963-2007/08 being up to 25% different from the long-term record. There is no clear overall trend, some sites show an increase in accumulation over the period 1963 to present while others show a decrease. Almost all of the sites above 3200 m above sea level (asl) suggest a decrease. These sites also show a significantly lower accumulation value than large-scale assessments both for the period 1963 to present and for the long-term mean at the respective drill sites. The spatial accumulation distribution is influenced mainly by elevation and distance to the ocean (continentality), as expected. Ground-penetrating radar data around the drill sites show a spatial variability within 10-20% over several tens of kilometers, indicating that our drill sites are well representative for the area around them. Our results are important for large-scale assessments of Antarctic mass balance and model validation.
Project(s):
Coverage:
Median Latitude: -82.007815 * Median Longitude: 18.988116 * South-bound Latitude: -87.850000 * West-bound Longitude: -1.800000 * North-bound Latitude: -73.716670 * East-bound Longitude: 54.883330
Date/Time Start: 2007-01-01T00:00:00 * Date/Time End: 2008-01-01T00:00:00
Comment:
Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
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3 datasets
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Datasets listed in this publication series
- Anschütz, H; Sinisalo, A; Isaksson, E et al. (2011): (Table 3) Accumulation rates of firn cores along the IPY traverse over different time periods. https://doi.org/10.1594/PANGAEA.806995
- Anschütz, H; Sinisalo, A; Isaksson, E et al. (2011): (Table 1) Snow depths of volcanic peaks in firn cores along the IPY traverse (Leg 1). https://doi.org/10.1594/PANGAEA.806992
- Anschütz, H; Sinisalo, A; Isaksson, E et al. (2011): (Table 2) Snow depths of volcanic peaks in firn cores along the IPY traverse (Leg 2). https://doi.org/10.1594/PANGAEA.806994