CDOM Sources and Photobleaching Control Quantum Yields for Oceanic DMS Photolysis
Galí, Martí . et al.-- 10 pages Photolysis is a major removal pathway for the biogenic gas dimethylsulfide (DMS) in the surface ocean. Here we tested the hypothesis that apparent quantum yields (AQY) for DMS photolysis varied according to the quantity and quality of its photosensitizers, chiefly chr...
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Online Access: | http://hdl.handle.net/10261/143394 https://doi.org/10.1021/acs.est.6b04278 |
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ftcsic:oai:digital.csic.es:10261/143394 2024-02-11T10:08:51+01:00 CDOM Sources and Photobleaching Control Quantum Yields for Oceanic DMS Photolysis Galí, Martí Marrasé, Cèlia Simó, Rafel 2016-12 http://hdl.handle.net/10261/143394 https://doi.org/10.1021/acs.est.6b04278 unknown American Chemical Society https://dx.doi.org/10.1021/acs.est.6b04278 Sí doi:10.1021/acs.est.6b04278 issn: 0013-936X e-issn: 1520-5851 Environmental Science and Technology 50(24): 13361-13370 (2016) http://hdl.handle.net/10261/143394 none artículo http://purl.org/coar/resource_type/c_6501 2016 ftcsic https://doi.org/10.1021/acs.est.6b04278 2024-01-16T10:20:12Z Galí, Martí . et al.-- 10 pages Photolysis is a major removal pathway for the biogenic gas dimethylsulfide (DMS) in the surface ocean. Here we tested the hypothesis that apparent quantum yields (AQY) for DMS photolysis varied according to the quantity and quality of its photosensitizers, chiefly chromophoric dissolved organic matter (CDOM) and nitrate. AQY compiled from the literature and unpublished studies ranged across 3 orders of magnitude at the 330 nm reference wavelength. The smallest AQY(330) were observed in coastal waters receiving major riverine inputs of terrestrial CDOM (0.06–0.5 m3 (mol quanta)−1). In open-ocean waters, AQY(330) generally ranged between 1 and 10 m3 (mol quanta)−1. The largest AQY(330), up to 34 m3 (mol quanta)−1), were seen in the Southern Ocean potentially associated with upwelling. Despite the large AQY variability, daily photolysis rate constants at the sea surface spanned a smaller range (0.04–3.7 d–1), mainly because of the inverse relationship between CDOM absorption and AQY. Comparison of AQY(330) with CDOM spectral signatures suggests there is an interplay between CDOM origin (terrestrial versus marine) and photobleaching that controls variations in AQYs, with a secondary role for nitrate. Our results can be used for regional or large-scale assessment of DMS photolysis rates in future studies Peer Reviewed Article in Journal/Newspaper Southern Ocean Digital.CSIC (Spanish National Research Council) Southern Ocean Environmental Science & Technology 50 24 13361 13370 |
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Galí, Martí . et al.-- 10 pages Photolysis is a major removal pathway for the biogenic gas dimethylsulfide (DMS) in the surface ocean. Here we tested the hypothesis that apparent quantum yields (AQY) for DMS photolysis varied according to the quantity and quality of its photosensitizers, chiefly chromophoric dissolved organic matter (CDOM) and nitrate. AQY compiled from the literature and unpublished studies ranged across 3 orders of magnitude at the 330 nm reference wavelength. The smallest AQY(330) were observed in coastal waters receiving major riverine inputs of terrestrial CDOM (0.06–0.5 m3 (mol quanta)−1). In open-ocean waters, AQY(330) generally ranged between 1 and 10 m3 (mol quanta)−1. The largest AQY(330), up to 34 m3 (mol quanta)−1), were seen in the Southern Ocean potentially associated with upwelling. Despite the large AQY variability, daily photolysis rate constants at the sea surface spanned a smaller range (0.04–3.7 d–1), mainly because of the inverse relationship between CDOM absorption and AQY. Comparison of AQY(330) with CDOM spectral signatures suggests there is an interplay between CDOM origin (terrestrial versus marine) and photobleaching that controls variations in AQYs, with a secondary role for nitrate. Our results can be used for regional or large-scale assessment of DMS photolysis rates in future studies Peer Reviewed |
format |
Article in Journal/Newspaper |
author |
Galí, Martí Marrasé, Cèlia Simó, Rafel |
spellingShingle |
Galí, Martí Marrasé, Cèlia Simó, Rafel CDOM Sources and Photobleaching Control Quantum Yields for Oceanic DMS Photolysis |
author_facet |
Galí, Martí Marrasé, Cèlia Simó, Rafel |
author_sort |
Galí, Martí |
title |
CDOM Sources and Photobleaching Control Quantum Yields for Oceanic DMS Photolysis |
title_short |
CDOM Sources and Photobleaching Control Quantum Yields for Oceanic DMS Photolysis |
title_full |
CDOM Sources and Photobleaching Control Quantum Yields for Oceanic DMS Photolysis |
title_fullStr |
CDOM Sources and Photobleaching Control Quantum Yields for Oceanic DMS Photolysis |
title_full_unstemmed |
CDOM Sources and Photobleaching Control Quantum Yields for Oceanic DMS Photolysis |
title_sort |
cdom sources and photobleaching control quantum yields for oceanic dms photolysis |
publisher |
American Chemical Society |
publishDate |
2016 |
url |
http://hdl.handle.net/10261/143394 https://doi.org/10.1021/acs.est.6b04278 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
https://dx.doi.org/10.1021/acs.est.6b04278 Sí doi:10.1021/acs.est.6b04278 issn: 0013-936X e-issn: 1520-5851 Environmental Science and Technology 50(24): 13361-13370 (2016) http://hdl.handle.net/10261/143394 |
op_rights |
none |
op_doi |
https://doi.org/10.1021/acs.est.6b04278 |
container_title |
Environmental Science & Technology |
container_volume |
50 |
container_issue |
24 |
container_start_page |
13361 |
op_container_end_page |
13370 |
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1790608479625412608 |