Dimethylated sulfur compounds in the Peruvian upwelling system
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Published:2022-02-04
Issue:3
Volume:19
Page:701-714
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ISSN:1726-4189
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Container-title:Biogeosciences
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language:en
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Short-container-title:Biogeosciences
Author:
Zhao YananORCID, Booge Dennis, Marandino Christa A., Schlundt Cathleen, Bracher AstridORCID, Atlas Elliot L.ORCID, Williams Jonathan, Bange Hermann W.ORCID
Abstract
Abstract. Our understanding of the biogeochemical cycling of the
climate-relevant trace gas dimethyl sulfide (DMS) in the Peruvian upwelling
system is still limited. Here we present oceanic and atmospheric DMS
measurements which were made during two shipborne cruises in December 2012
(M91) and October 2015 (SO243) in the Peruvian upwelling region.
Dimethylsulfoniopropionate (DMSP) and dimethyl sulfoxide (DMSO) were also
measured during M91. DMS concentrations were 1.9 ± 0.9 and 2.5 ± 1.9 nmol L−1 in surface waters in October 2015 and
December 2012, respectively. Nutrient availability appeared to be the main
driver of the observed variability in the surface DMS distributions in the
coastal areas. DMS, DMSP, and DMSO showed maxima in the surface layer, and no
elevated concentrations associated with the oxygen minimum zone off Peru
were measured. The possible role of DMS, DMSP, and DMSO as radical scavengers
(stimulated by nitrogen limitation) is supported by their negative
correlations with N:P (sum of nitrate and nitrite : dissolved phosphate)
ratios. Large variations in atmospheric DMS mole fractions were measured
during M91 (144.6 ± 95.0 ppt) and SO243 (91.4 ± 55.8 ppt);
however, the atmospheric mole fractions were generally low, and the
sea-to-air flux was primarily driven by seawater DMS. The Peruvian upwelling
region was identified as a source of atmospheric DMS in December 2012 and
October 2015. However, in comparison to the previous measurements in the
adjacent regions, the Peru upwelling was a moderate source of DMS emissions at
either time (M91: 5.9 ± 5.3 µmol m−2 d−1; SO243: 3.8 ± 2.7 µmol m−2 d−1).
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Ecology, Evolution, Behavior and Systematics
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