Journal of Atmospheric Chemistry

, Volume 17, Issue 2, pp 95–122

Nitrogen and sulfur species in Antarctic aerosols at Mawson, Palmer Station, and Marsh (King George Island)

Authors

  • D. L. Savoie
    • Division of Marine and Atmospheric Chemistry, Rosenstiel School of Marine and Atmospheric ScienceUniversity of Miami
  • J. M. Prospero
    • Division of Marine and Atmospheric Chemistry, Rosenstiel School of Marine and Atmospheric ScienceUniversity of Miami
  • R. J. Larsen
    • Department of EnergyEnvironmental Measurements Laboratory
    • Division of Marine and Atmospheric Chemistry, Rosenstiel School of Marine and Atmospheric ScienceUniversity of Miami
  • Huang F. 
    • Division of Marine and Atmospheric Chemistry, Rosenstiel School of Marine and Atmospheric ScienceUniversity of Miami
  • M. A. Izaguirre
    • Division of Marine and Atmospheric Chemistry, Rosenstiel School of Marine and Atmospheric ScienceUniversity of Miami
  • Huang T. 
    • Division of Marine and Atmospheric Chemistry, Rosenstiel School of Marine and Atmospheric ScienceUniversity of Miami
  • T. H. Snowdon
    • Division of Marine and Atmospheric Chemistry, Rosenstiel School of Marine and Atmospheric ScienceUniversity of Miami
  • L. Custals
    • Division of Marine and Atmospheric Chemistry, Rosenstiel School of Marine and Atmospheric ScienceUniversity of Miami
  • C. G. Sanderson
    • Department of EnergyEnvironmental Measurements Laboratory
    • Division of Marine and Atmospheric Chemistry, Rosenstiel School of Marine and Atmospheric ScienceUniversity of Miami
Article

DOI: 10.1007/BF00702821

Cite this article as:
Savoie, D.L., Prospero, J.M., Larsen, R.J. et al. J Atmos Chem (1993) 17: 95. doi:10.1007/BF00702821

Abstract

High volume bulk aerosol samples were collected continuously at three Antarctic sites: Mawson (67.60° S, 62.50° E) from 20 February 1987 to 6 January 1992; Palmer Station (64.77° S, 64.06° W) from 3 April 1990 to 15 June 1991; and Marsh (62.18° S, 58.30° W) from 28 March 1990, to 1 May 1991. All samples were analyzed for Na+, SO42−, NO3, methanesulfonate (MSA), NH4+,210Pb, and7Be. At Mawson for which we have a multiple year data set, the annual mean concentration of each species sometimes vary significantly from one year to the next: Na+, 68–151 ng m−3; NO3, 25–30 ng m−3; nss SO42−, 81–97 ng m−3; MSA, 19–28 ng m−3; NH4+, 16–21 ng m−3;210Pb, 0.75–0.86 fCi m−3. Results from multiple variable regression of non-sea-salt (nss) SO42− with MSA and NO3 as the independent variables indicates that, at Mawson, the nss SO42−/MSA ratio resulting from the oxidation of dimethylsulfide (DMS) is 2.80±0.13, about 13% lower than our earlier estimate (3.22) that was based on 2.5 years of data. A similar analysis indicates that the ratio at Palmer is about 40% lower, 1.71±0.10, and more comparable to previous results over the southern oceans. These results when combined with previously published data suggest that the differences in the ratio may reflect a more rapid loss of MSA relative to nss SO42− during transport over Antarctica from the oceanic source region. The mean210Pb concentrations at Palmer and Marsh and the mean NO3 concentration at Palmer are about a factor of two lower than those at Mawson. The210Pb distributions are consistent with a210Pb minimum in the marine boundary layer in the region of 40°–60° S. These features and the similar seasonalities of NO3 and210Pb at Mawson support the conclusion that the primary source regions for NO3 are continental. In contrast, the mean concentrations of MSA, nss SO42−, and NH4+ at Palmer are all higher than those at Mawson: MSA by a factor of 2; nss SO42− by 10%; and NH4+ by more than 50%. However, the factor differences exhibit substantial seasonal variability; the largest differences generally occur during the austral summer when the concentrations of most of the species are highest. NH4+/(nss SO42−+MSA) equivalent ratios indicate that NH3 neutralizes about 60% of the sulfur acids during December at both Mawson and Palmer, but only about 30% at Mawson during February and March.

Key words

AntarcticaPalmerMarshMawsonaerosol particlesbiogeochemical cyclessulfatenitratemethanesulfonatelead-210beryllium-7sea-saltammonium

Copyright information

© Kluwer Academic Publishers 1993