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Snow depths of volcanic events and accumulation rates of firn cores from the IPY traverse, Antarctica (2011)

Anschütz, Helgard ; Sinisalo, A ; Isaksson, Elisabeth ; [et al.]

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In: Supplement to: 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): 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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Publication Date: 2023-12-13

Description: 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.

Keywords: International Polar Year (2007-2008); IPY

Type: Dataset

Format: application/zip, 3 datasets

	Location	Call Number	Limitation	Availability

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