Title Variation of accumulation rates over the last eight centuries on the East Antarctic Plateau derived from volcanic signals in ice cores
Author Anschutz, H.; Sinisalo, A.; Isaksson, E.; McConnell, J.R.; Hamran, S.E.; Bisiaux, M.M.; Pasteris, D.; Neumann, T.A.; Winther, J.G.
Author Affil Anschutz, H., Norwegian Polar Institute, Tromso, Norway. Other: University of Oslo, Norway; Desert Research Institute; Forsvarets Forskningsinstitutt, Norway; NASA, Goddard Space Flight Center
Source Journal of Geophysical Research, 116(D20), Citation D20103. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0148- 0227
Publication Date 2011
Notes In English. 43 refs. CRREL Acc. No: 66002103
Index Terms chemical composition; firn; ice; snow; Antarctica--East Antarctica; Antarctica; Cenozoic; East Antarctica; electrical conductivity; eruptions; Holocene; ice cores; International Polar Year 2007-08; IPY 2007-08 Research Publications; paleoatmosphere; Quaternary; upper Holocene; volcanism
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.
URL http://hdl.handle.net/10.1029/2011JD015753
Publication Type journal article
Record ID 312456