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Measurements of dimethyl sulfide and SO2 during GTE/CITE 3As part of NASA's Tropospheric Experiment Chemical Instrumentation Test and Evaluation (GTE/CITE 3) Sulfur Gas Intercomparison, we conducted measurements of dimethyl sulfide (DMS) and SO2 using two techniques well suited for sampling from an aircraft due to their simplicity of design. DMS was collected by preconcentration on gold wire preceded by a KOH-impregnated filter oxidant scrubber, and analyzed by gas chromatography with flame photometric detection. SO2 was collected on K2CO3/glycerol-impregnated filters and analyzed by ion chromatography. In blind tests, both techniques produced excellent agreement with National Institutes of Standards and Technology (NIST) standards. For field measurements, the DMS technique produced excellent correlation with the mean of the six different techniques intercompared. For SO2, the five techniques intercompared were rather poorly correlated, but correlations between the three techniques which passed NIST standards tests were somewhat better. Our SO2 filter measurements exhibited rather large uncertainties due to higher than normal variabiltiy of the filter blanks, which we believe was caused by extended storage in the field. In measurements conducted off the coast of Natal, Brazil, a diurnal afternoon minimum in DMS concentrations accompanied by a corresponding maximum in SO2 concentrations was observed. However, due to rather large uncertainties in the SO2 measurements, any conclusions about the SO2 trend must by considered tentative.
Document ID
19950049251
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Ferek, Ronald J.
(University of Washington, Seattle, WA United States)
Hegg, Dean A.
(University of Washington, Seattle, WA United States)
Date Acquired
August 16, 2013
Publication Date
December 20, 1993
Publication Information
Publication: Journal of Geophysical Research
Volume: 98
Issue: D12
ISSN: 0148-0227
Subject Category
Environment Pollution
Accession Number
95A80850
Funding Number(s)
CONTRACT_GRANT: NAG1-925
CONTRACT_GRANT: NSF ATM-90-08639
Distribution Limits
Public
Copyright
Other

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