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Variations in the methanesulfonate to sulfate molar ratio in submicrometer marine aerosol particles over the south Pacific OceanSeawater concentrations of dimethylsulfide (DMS) and atmospheric concentrations of DMS, sulfur dioxide, methanesulfonate (MSA), and non-sea-salt (nss) sulfate were measured over the eastern Pacific Ocean between 105 deg and 110 deg W from 20 deg N to 60 deg S during February and March 1989. Although the samples collected in the Southern Hemisphere appear to be of marine origin, no significant correlation was found between the latitudinal distributions of DMS, SO2, MSA, and nss SO4(2-). However, an inverse correlation was found between atmospheric temperature and the MSA to nss SO4(2-) molar ratio in submicrometer aerosol particles with a decrease in temperature corresponding to an increase in the molar ratio. Although this trend is consistent with laboratory results indicating the favored production of MSA at lower temperatures, it is contrary to Southern Hemisphere baseline station data. This suggests either a decrease in the supply of DMS relative to nonmarine sources of nss SO4(2-) at the baseline stations in winter or additional mechanisms that affect the relative production of MSA and nss SO4(2-).
Document ID
19920063158
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bates, Timothy S.
(NOAA, Pacific Marine Environmental Laboratory, Seattle WA, United States)
Calhoun, Julie A.
(Joint Institute for the Study of the Atmosphere and Ocean Seattle, WA, United States)
Quinn, Patricia K.
(NOAA, Pacific Marine Environmental Laboratory, Seattle WA, United States)
Date Acquired
August 15, 2013
Publication Date
June 20, 1992
Publication Information
Publication: Journal of Geophysical Research
Volume: 97
Issue: D9, J
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
92A45782
Distribution Limits
Public
Copyright
Other

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