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Original Research Papers

Sulfur isotopic signals in two shallow ice cores from Dronning Maud Land, Antarctica

Authors:

Ulf Jonsell ,

Department of Physical Geography and Quaternary Geology, SE
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Margareta E. Hansson,

Department of Physical Geography and Quaternary Geology, SE
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Carl-Magnus Mörth,

Department of Geology and Geochemistry, Stockholm University, SE
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Peter Torssander

Department of Geology and Geochemistry, Stockholm University, SE
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Abstract

Sulfate deposited onto the Antarctic ice sheet originates from a mixture of sulfur sources. Two 100 m long ice cores from Dronning Maud Land have been studied by means of sulfur isotopic analysis and detailed ion analysis to reveal temporal and spatial differences in the influencing sulfur source. The two ice cores represent the coastal area and the polar plateau, respectively. The isotopic signals were similar within each ice core, indicating no temporal change of influencing sources during the last 1100 yr. The mean values at the two different sites were also similar: 14.6 ± 0.3% and 14.7 ± 0.3‰, respectively.

The similarity remains between calculated non-sea-salt values when a sulfate-depleted sea-salt aerosol is assumed in the costal core. When the influence of sporadic explosive volcanic eruptions is subtracted from the signal, the isotopic value from the polar plateau(15.4 ± 0.6‰) is significantly lower than prescribed values for marine biogenic sulfur. This suggests that one or more additional sources contribute to the sulfate budget. Several possible contributors are discussed in the context of former sulfur isotopic signals presented from Antarctica.

How to Cite: Jonsell, U., Hansson, M.E., Mörth, C.-M. and Torssander, P., 2005. Sulfur isotopic signals in two shallow ice cores from Dronning Maud Land, Antarctica. Tellus B: Chemical and Physical Meteorology, 57(4), pp.341–350. DOI: http://doi.org/10.3402/tellusb.v57i4.16558
  Published on 01 Jan 2005
 Accepted on 29 Mar 2005            Submitted on 3 Aug 2004

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