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Dimethyl disulfide (DMDS) and dimethyl sulfide (DMS) emissions from biomass burning in Australia
Author(s) -
Meinardi Simone,
Simpson Isobel J.,
Blake Nicola J.,
Blake Donald R.,
Rowland F. Sherwood
Publication year - 2003
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2003gl016967
Subject(s) - dimethyl sulfide , dimethyl disulfide , carbon disulfide , sulfur , sulfuric acid , sulfur dioxide , carbon dioxide , carbonyl sulfide , carbon monoxide , chemistry , methane , environmental chemistry , atmosphere (unit) , biomass (ecology) , inorganic chemistry , organic chemistry , meteorology , geology , catalysis , oceanography , physics
We identify dimethyl disulfide (DMDS) as the major reduced sulfur‐containing gas emitted from bushfires in Australia's Northern Territory. Like dimethyl sulfide (DMS), DMDS is oxidized in the atmosphere to sulfur dioxide (SO 2 ) and methane sulfonic acid (MSA), which are intermediates in the formation of sulfuric acid (H 2 SO 4 ). The mixing ratios of DMDS and DMS were the highest we have ever detected, with maximum values of 113 and 35 ppbv, respectively, whereas background values were below the detection limit (10 pptv). Molar emission ratios relative to carbon monoxide (CO) were [1.6 ± 0.1] × 10 −5 and [6.2 ± 0.3] × 10 −6 , for DMDS and DMS respectively, while molar emission ratios relative to carbon dioxide (CO 2 ) were [4.7 ± 0.4] × 10 −6 and [1.4 ± 0.4] × 10 −7 , respectively. Assuming these observations are representative of biomass burning, we estimate that biomass burning could yield up to 175 Gg/yr of DMDS (119 Gg S/yr) and 13 Gg/yr of DMS.