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

Article English OPEN
Jonsell, Ulf ; Hansson, Margareta E. ; Mörth, Carl-Magnus ; Torssander, Peter (2011)

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%o 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.DOI: 10.1111/j.1600-0889.2005.00157.x
  • References (52)
    52 references, page 1 of 6

    Alexander, B., Thiemens, M. H., Farquhar, J., Kaufman, A. J., Savarino, J. and co-author 2003. East Antarctic ice core sulfur isotope measurements over a complete glacial-interglacial cycle. J. Geophys. Res. Atmos. 108(24), 4786, doi:10.1029/2003JD003513.

    Aristarain, A. J. and Delmas, R. J. 2002. Snow chemistry measurements on James Ross island (Antarctic Peninsula) showing sea-salt aerosol modifications. Atmos. Environ. 36(4), 765-772.

    Bamber, J. L. and Bindschadler, R. A. 1997. An improved elevation dataset for climate and ice-sheet modelling: validation with satellite imagery. Ann. Glaciol. 25, 439-444.

    Basile, I., Grousset, F. E., Revel, M., Petit, J. R., Biscaye, P. E. and co-author 1997. Patagonian origin of glacial dust deposited in east Antarctica (Vostok and Dome C) during glacial stages 2, 4 and 6. Earth Planet Sci. Lett. 146(3-4), 573-589.

    Basile, I., Petit, J.-R., Tourun, S., Grousset, F. and Barkov, N. 2001. Volcanic layers in Antarctic (Vostok) ice cores: source identification and atmospheric implications. J. Geophys. Res. Atmos. 106(23) 31 915- 31 931.

    Calhoun, J. A., Bates, T. S. and Charlson, R. J. 1991. Sulfur isotope measurements of submicrometer sulfate aerosol particles over the Pacific Ocean. Geophys. Res. Lett. 18(10), 1877-1880.

    Castleman, A. W.-Jr., Munkelwitz, H. R. and Manowitz, B. 1973. Contribution of volcanic sulfur compounds to the stratospheric aerosol layer. Nature 244, 345-346.

    Curran, M. A. J., Palmer, A. S., Van, O. T. D., Morgan, V. I., Phillips, K. L. and co-authors 2002. Post-depositional movement of methanesulphonic acid at Law Dome, Antarctica, and the influence of accumulation rate. Ann. Glaciol. 35, 333-339.

    Delmas, R. J., Legrand, M., Aristarain, A. J. and Zanolini, F. 1985. Volcanic deposits in Antarctic snow and ice. J. Geophys. Res. Atmos. 90(7), 2901-2920.

    Delmas, R. J., Wagnon, P., Goto, A. K., Kamiyama, K. and Watanabe, O. 2003. Evidence for the loss of snow-deposited MSA to the interstitial gaseous phase in central Antarctic firn. Tellus 55B, 71-79.

  • Metrics
    No metrics available
Share - Bookmark