Atmospheric hydrogen sulfide over the equatorial Pacific (SAGA 3)
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Five N-S transects were made across the equator between Hawaii and American Samoa. The concentrations ranged from below the detection limit of 0.4 0.5 (1) to 14.4 ppt with an average value of 3.6 2.3 ppt (1, n = 72). The highest concentrations were found on the easternmost two transects just south of the equator. The average concentrations of 3.6 ppt observed on this cruise is the lowest reported value for background atmospheric H2S over the tropical oceans. Model calculations indicate that the ocean source of H2S in this region is in the range of 9 to 21 10-8mol m-2d-1. The concentration of free sulfide (H2S + S2-) in the surface mixed layer of the ocean is estimated to be in the range of 32 to 67 pmol L-1. In the atmosphere the oxidation of H2S produces SO2at a rate of 2.1 to 4.4. 10-11mol m-3d-1which is only a small fraction of that estimated from the oxidation of dimethyl sulfide (DMS) in this region. -from Authors
Journal of Geophysical Research
author list (cited authors)
Yvon, S. A., Cooper, D. J., Koropalov, V., & Saltzman, E. S.