High dimethylsulfide photolysis rates in nitrate-rich Antarctic waters

dc.contributor.author Toole, Dierdre A.
dc.contributor.author Kieber, David J.
dc.contributor.author Kiene, Ronald P.
dc.contributor.author White, E. M.
dc.contributor.author Bisgrove, J.
dc.contributor.author del Valle, Daniela A.
dc.contributor.author Slezak, D.
dc.date.accessioned 2010-04-23T19:17:13Z
dc.date.available 2010-04-23T19:17:13Z
dc.date.issued 2004-06-09
dc.description Author Posting. © American Geophysical Union, 2004. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 31 (2004): L11307, doi:10.1029/2004GL019863. en_US
dc.description.abstract The photochemistry of dimethylsulfide (DMS) was examined in the Southern Ocean to assess its impact on the biogeochemical dynamics of DMS in Antarctic waters. Very high DMS photolysis rate constants (0.16–0.23 h−1) were observed in surface waters exposed to full sunlight. DMS photolysis rates increased linearly with added nitrate concentrations, and 35% of the DMS loss in unamended samples was attributed to the photochemistry of ambient nitrate (29 μM). Experiments with optical filters showed that the UV-A band of sunlight (320–400 nm) accounted for ~65% of DMS photolysis suggesting that dissolved organic matter was the main photosensitizer for DMS photolysis. During the austral spring, DMS photolysis was the dominant loss mechanism under non-bloom and non-ice cover conditions owing to the high doses and deep penetration of UV radiation in the water column, low observed microbial consumption rates, and high in situ nitrate concentrations. en_US
dc.description.sponsorship This work was supported by NSF (OPP- 0230499, DJK; OPP-0230497, RPK). en_US
dc.format.mimetype application/pdf
dc.identifier.citation Geophysical Research Letters 31 (2004): L11307 en_US
dc.identifier.doi 10.1029/2004GL019863
dc.identifier.uri https://hdl.handle.net/1912/3309
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.uri https://doi.org/10.1029/2004GL019863
dc.title High dimethylsulfide photolysis rates in nitrate-rich Antarctic waters en_US
dc.type Article en_US
dspace.entity.type Publication
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