Photochemical mineralization of terrigenous DOC to dissolved inorganic carbon in ocean
When terrigenous dissolved organic carbon (tDOC) rich in chromophoric dissolved organic matter (tCDOM) enters the ocean, solar radiation mineralizes it partially into dissolved inorganic carbon (DIC). This study addresses the amount and the rates of DIC photoproduction from tDOC and the area of ocea...
Published in: | Global Biogeochemical Cycles |
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American Geophysical Union
2018
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ftjyvaeskylaenun:oai:jyx.jyu.fi:123456789/57282 2024-02-04T10:01:57+01:00 Photochemical mineralization of terrigenous DOC to dissolved inorganic carbon in ocean Aarnos, Hanna Gélinas, Yves Kasurinen, Ville Gu, Yufei Puupponen, Veli-Mikko Vähätalo, Anssi 2018 250-266 application/pdf http://urn.fi/URN:NBN:fi:jyu-201803071671 eng eng American Geophysical Union Global Biogeochemical Cycles 0886-6236 2 32 10.1002/2017GB005698 Aarnos, H., Gélinas, Y., Kasurinen, V., Gu, Y., Puupponen, V.-M., & Vähätalo, A. (2018). Photochemical mineralization of terrigenous DOC to dissolved inorganic carbon in ocean. Global Biogeochemical Cycles , 32 (2), 250-266. https://doi.org/10.1002/2017GB005698 CONVID_27874949 TUTKAID_76666 URN:NBN:fi:jyu-201803071671 http://urn.fi/URN:NBN:fi:jyu-201803071671 © 2018. American Geophysical Union. This is a final draft version of an article whose final and definitive form has been published by American Geophysical Union. Published in this repository with the kind permission of the publisher. openAccess DOC CDOM ocean liuennut orgaaninen hiili joet hiili meret valokemia article http://purl.org/eprint/type/JournalArticle http://purl.org/coar/resource_type/c_2df8fbb1 acceptedVersion A1 2018 ftjyvaeskylaenun 2024-01-11T00:03:17Z When terrigenous dissolved organic carbon (tDOC) rich in chromophoric dissolved organic matter (tCDOM) enters the ocean, solar radiation mineralizes it partially into dissolved inorganic carbon (DIC). This study addresses the amount and the rates of DIC photoproduction from tDOC and the area of ocean required to photomineralize tDOC. We collected water samples from 10 major rivers, mixed them with artificial seawater, and irradiated them with simulated solar radiation to measure DIC photoproduction and the photobleaching of tCDOM. The linear relationship between DIC photoproduction and tCDOM photobleaching was used to estimate the amount of photoproduced DIC from the tCDOM fluxes of the study rivers. Solar radiation was estimated to mineralize 12.5 ± 3.7 Tg C yr−1 (10 rivers)−1 or 18 ± 8% of tDOC flux. The irradiation experiments also approximated typical apparent spectral quantum yields for DIC photoproduction (ϕλ) over the entire lifetime of the tCDOM. Based on ϕλs and the local solar irradiances in river plumes, the annual areal DIC photoproduction rates from tDOC were calculated to range from 52 ± 4 (Lena River) to 157 ± 2 mmol C m−2 yr−1 (Mississippi River). When the amount of photoproduced DIC was divided by the areal rate, 9.6 ± 2.5 × 106 km2 of ocean was required for the photomineralization of tDOC from the study rivers. Extrapolation to the global tDOC flux yields 45 (31–58) Tg of photoproduced DIC per year in the river plumes that cover 34 (25–43) × 106 km2 of the ocean. peerReviewed Article in Journal/Newspaper lena river JYX - Jyväskylä University Digital Archive Global Biogeochemical Cycles 32 2 250 266 |
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Open Polar |
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JYX - Jyväskylä University Digital Archive |
op_collection_id |
ftjyvaeskylaenun |
language |
English |
topic |
DOC CDOM ocean liuennut orgaaninen hiili joet hiili meret valokemia |
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DOC CDOM ocean liuennut orgaaninen hiili joet hiili meret valokemia Aarnos, Hanna Gélinas, Yves Kasurinen, Ville Gu, Yufei Puupponen, Veli-Mikko Vähätalo, Anssi Photochemical mineralization of terrigenous DOC to dissolved inorganic carbon in ocean |
topic_facet |
DOC CDOM ocean liuennut orgaaninen hiili joet hiili meret valokemia |
description |
When terrigenous dissolved organic carbon (tDOC) rich in chromophoric dissolved organic matter (tCDOM) enters the ocean, solar radiation mineralizes it partially into dissolved inorganic carbon (DIC). This study addresses the amount and the rates of DIC photoproduction from tDOC and the area of ocean required to photomineralize tDOC. We collected water samples from 10 major rivers, mixed them with artificial seawater, and irradiated them with simulated solar radiation to measure DIC photoproduction and the photobleaching of tCDOM. The linear relationship between DIC photoproduction and tCDOM photobleaching was used to estimate the amount of photoproduced DIC from the tCDOM fluxes of the study rivers. Solar radiation was estimated to mineralize 12.5 ± 3.7 Tg C yr−1 (10 rivers)−1 or 18 ± 8% of tDOC flux. The irradiation experiments also approximated typical apparent spectral quantum yields for DIC photoproduction (ϕλ) over the entire lifetime of the tCDOM. Based on ϕλs and the local solar irradiances in river plumes, the annual areal DIC photoproduction rates from tDOC were calculated to range from 52 ± 4 (Lena River) to 157 ± 2 mmol C m−2 yr−1 (Mississippi River). When the amount of photoproduced DIC was divided by the areal rate, 9.6 ± 2.5 × 106 km2 of ocean was required for the photomineralization of tDOC from the study rivers. Extrapolation to the global tDOC flux yields 45 (31–58) Tg of photoproduced DIC per year in the river plumes that cover 34 (25–43) × 106 km2 of the ocean. peerReviewed |
format |
Article in Journal/Newspaper |
author |
Aarnos, Hanna Gélinas, Yves Kasurinen, Ville Gu, Yufei Puupponen, Veli-Mikko Vähätalo, Anssi |
author_facet |
Aarnos, Hanna Gélinas, Yves Kasurinen, Ville Gu, Yufei Puupponen, Veli-Mikko Vähätalo, Anssi |
author_sort |
Aarnos, Hanna |
title |
Photochemical mineralization of terrigenous DOC to dissolved inorganic carbon in ocean |
title_short |
Photochemical mineralization of terrigenous DOC to dissolved inorganic carbon in ocean |
title_full |
Photochemical mineralization of terrigenous DOC to dissolved inorganic carbon in ocean |
title_fullStr |
Photochemical mineralization of terrigenous DOC to dissolved inorganic carbon in ocean |
title_full_unstemmed |
Photochemical mineralization of terrigenous DOC to dissolved inorganic carbon in ocean |
title_sort |
photochemical mineralization of terrigenous doc to dissolved inorganic carbon in ocean |
publisher |
American Geophysical Union |
publishDate |
2018 |
url |
http://urn.fi/URN:NBN:fi:jyu-201803071671 |
genre |
lena river |
genre_facet |
lena river |
op_relation |
Global Biogeochemical Cycles 0886-6236 2 32 10.1002/2017GB005698 Aarnos, H., Gélinas, Y., Kasurinen, V., Gu, Y., Puupponen, V.-M., & Vähätalo, A. (2018). Photochemical mineralization of terrigenous DOC to dissolved inorganic carbon in ocean. Global Biogeochemical Cycles , 32 (2), 250-266. https://doi.org/10.1002/2017GB005698 CONVID_27874949 TUTKAID_76666 URN:NBN:fi:jyu-201803071671 http://urn.fi/URN:NBN:fi:jyu-201803071671 |
op_rights |
© 2018. American Geophysical Union. This is a final draft version of an article whose final and definitive form has been published by American Geophysical Union. Published in this repository with the kind permission of the publisher. openAccess |
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Global Biogeochemical Cycles |
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32 |
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2 |
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250 |
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266 |
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1789968225733181440 |