Papers Published

1. Davis, D. and Chen, G. and Kasibhatla, P. and Jefferson, A. and Tanner, D. and Eisele, F. and Lenschow, D. and Neff, W. and Berresheim, H., DMS oxidation in the Antarctic marine boundary layer: comparison of model simulations and field observations of DMS, DMSO, DMSO₂, H₂SO₄(g), MSA(g), and MSA(p), J. Geophys. Res. (USA), vol. 103 no. D1 (1998), pp. 1657 - 78 [97JD03452] .
   (last updated on 2007/04/09)

   Abstract:
   A sulfur field study (SCATE) at Palmer Station Antarctica (1994 January 18 to February 25) has revealed several major new findings concerning dimethyl sulfide (DMS) oxidation chemistry and the cycling of sulfur within the Antarctic environment. Significant evidence was found supporting the notion that the OH/DMS addition reaction is a major source of dimethyl sulfoxide (DMSO). Methane sulfonic acid (MSA(g)) levels were also found to be consistent with an OH/DMS addition mechanism involving the sequential oxidation of the products DMSO and methane sulfinic acid (MSIA). Evidence supporting the hypothesis that the OH/DMS addition reaction, as well as follow-on reactions involving OH/DMSO, are a major source of SO₂ was significant, but not conclusive. No evidence could be found supporting the notion that reactive intermediates (i.e. SO₃) other than SO₂ were an important source of H₂SO₄. Quite clearly, one of the major findings of SCATE was the recognition that a large fraction of the Antarctic oxidative cycle for DMS (near Palmer Station) took place above the boundary layer in the so-called atmospheric buffer layer. Although still speculative in places, the overall picture emerging from the SCATE field/modeling results is one involving major coupling between chemistry and dynamics in the Antarctic. Previous chemical interpretations of Antarctic field data may need to be altered

   Keywords:
   atmospheric boundary layer;atmospheric chemistry;organic compounds;oxidation;