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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Main Authors: | , , , , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Wiley/Blackwell
2019
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Online Access: | http://hdl.handle.net/10138/308195 |
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/308195 2024-01-07T09:44:42+01:00 Photochemical Mineralization of Terrigenous DOC to Dissolved Inorganic Carbon in Ocean Aarnos, Hanna Gelinas, Yves Kasurinen, Ville Gu, Yufei Puupponen, Veli-Mikko Vähätalo, Anssi V. Environmental Sciences Faculty of Biological and Environmental Sciences Department of Forest Sciences Department of Physics 2019-12-13T09:26:01Z 17 application/pdf http://hdl.handle.net/10138/308195 eng eng Wiley/Blackwell 10.1002/2017GB005698 We thank all the scientists who contributed to the sampling for the Big River project: E. M. Paolucci (Parana), D. Musibono (Congo), A. Shantz (Mekong), S. R. Khan (Ganges-Brahmaputra), Q. Huang (Yangtze), W. Schneider and B. Heim (Lena), A. Rivas and C. E. Rezende (Amazon), E. Petrescu (Danube), and H. Reader (Mississippi). We are grateful to Nikos Hatzianastassiou for the data of global radiation. We thank Patricia Medeiros for providing the unpublished a CDOM data from the Amazon River plume. David J. Kieber and Roger I. Jones are thanked for commenting on the manuscript. This work was supported by the Academy of Finland (grant 111761), Academy of Finland Center of Excellence program (grant 307331), and by a personal grant of Maa- ja vesitekniikan Tuki ry (H. A.). Data are provided in the figures and the tables; the method and the data needed for determination of apparent quantum yield spectrum is described in a supporting information file. Aarnos , H , Gelinas , Y , Kasurinen , V , Gu , Y , Puupponen , V-M & Vähätalo , A V 2018 , ' Photochemical Mineralization of Terrigenous DOC to Dissolved Inorganic Carbon in Ocean ' , Global Biogeochemical Cycles , vol. 32 , no. 2 , pp. 250-266 . https://doi.org/10.1002/2017GB005698 85042180046 9d90887b-51f9-4d06-a3c7-af4f14fd5f9f http://hdl.handle.net/10138/308195 000426773600006 cc_by_nc_sa openAccess info:eu-repo/semantics/openAccess APPARENT QUANTUM YIELD NATURAL ORGANIC-MATTER AMAZON RIVER PLUME MICROBIAL DECOMPOSITION LIGHT-ABSORPTION ATLANTIC BIGHT COASTAL OCEAN WORLD RIVERS GLOBAL OCEAN HUMIC LAKE 1172 Environmental sciences 1171 Geosciences Article publishedVersion 2019 ftunivhelsihelda 2023-12-14T00:12:03Z 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 (phi(lambda)) over the entire lifetime of the tCDOM. Based on phi(lambda)s 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 x 10(6) km(2) 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) x 10(6) km(2) of the ocean. Peer reviewed Article in Journal/Newspaper lena river HELDA – University of Helsinki Open Repository Humic Lake ENVELOPE(-36.500,-36.500,-54.250,-54.250) Lambda ENVELOPE(-62.983,-62.983,-64.300,-64.300) Global Biogeochemical Cycles 32 2 250 266 |
institution |
Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
APPARENT QUANTUM YIELD NATURAL ORGANIC-MATTER AMAZON RIVER PLUME MICROBIAL DECOMPOSITION LIGHT-ABSORPTION ATLANTIC BIGHT COASTAL OCEAN WORLD RIVERS GLOBAL OCEAN HUMIC LAKE 1172 Environmental sciences 1171 Geosciences |
spellingShingle |
APPARENT QUANTUM YIELD NATURAL ORGANIC-MATTER AMAZON RIVER PLUME MICROBIAL DECOMPOSITION LIGHT-ABSORPTION ATLANTIC BIGHT COASTAL OCEAN WORLD RIVERS GLOBAL OCEAN HUMIC LAKE 1172 Environmental sciences 1171 Geosciences Aarnos, Hanna Gelinas, Yves Kasurinen, Ville Gu, Yufei Puupponen, Veli-Mikko Vähätalo, Anssi V. Photochemical Mineralization of Terrigenous DOC to Dissolved Inorganic Carbon in Ocean |
topic_facet |
APPARENT QUANTUM YIELD NATURAL ORGANIC-MATTER AMAZON RIVER PLUME MICROBIAL DECOMPOSITION LIGHT-ABSORPTION ATLANTIC BIGHT COASTAL OCEAN WORLD RIVERS GLOBAL OCEAN HUMIC LAKE 1172 Environmental sciences 1171 Geosciences |
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 (phi(lambda)) over the entire lifetime of the tCDOM. Based on phi(lambda)s 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 x 10(6) km(2) 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) x 10(6) km(2) of the ocean. Peer reviewed |
author2 |
Environmental Sciences Faculty of Biological and Environmental Sciences Department of Forest Sciences Department of Physics |
format |
Article in Journal/Newspaper |
author |
Aarnos, Hanna Gelinas, Yves Kasurinen, Ville Gu, Yufei Puupponen, Veli-Mikko Vähätalo, Anssi V. |
author_facet |
Aarnos, Hanna Gelinas, Yves Kasurinen, Ville Gu, Yufei Puupponen, Veli-Mikko Vähätalo, Anssi V. |
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 |
Wiley/Blackwell |
publishDate |
2019 |
url |
http://hdl.handle.net/10138/308195 |
long_lat |
ENVELOPE(-36.500,-36.500,-54.250,-54.250) ENVELOPE(-62.983,-62.983,-64.300,-64.300) |
geographic |
Humic Lake Lambda |
geographic_facet |
Humic Lake Lambda |
genre |
lena river |
genre_facet |
lena river |
op_relation |
10.1002/2017GB005698 We thank all the scientists who contributed to the sampling for the Big River project: E. M. Paolucci (Parana), D. Musibono (Congo), A. Shantz (Mekong), S. R. Khan (Ganges-Brahmaputra), Q. Huang (Yangtze), W. Schneider and B. Heim (Lena), A. Rivas and C. E. Rezende (Amazon), E. Petrescu (Danube), and H. Reader (Mississippi). We are grateful to Nikos Hatzianastassiou for the data of global radiation. We thank Patricia Medeiros for providing the unpublished a CDOM data from the Amazon River plume. David J. Kieber and Roger I. Jones are thanked for commenting on the manuscript. This work was supported by the Academy of Finland (grant 111761), Academy of Finland Center of Excellence program (grant 307331), and by a personal grant of Maa- ja vesitekniikan Tuki ry (H. A.). Data are provided in the figures and the tables; the method and the data needed for determination of apparent quantum yield spectrum is described in a supporting information file. Aarnos , H , Gelinas , Y , Kasurinen , V , Gu , Y , Puupponen , V-M & Vähätalo , A V 2018 , ' Photochemical Mineralization of Terrigenous DOC to Dissolved Inorganic Carbon in Ocean ' , Global Biogeochemical Cycles , vol. 32 , no. 2 , pp. 250-266 . https://doi.org/10.1002/2017GB005698 85042180046 9d90887b-51f9-4d06-a3c7-af4f14fd5f9f http://hdl.handle.net/10138/308195 000426773600006 |
op_rights |
cc_by_nc_sa openAccess info:eu-repo/semantics/openAccess |
container_title |
Global Biogeochemical Cycles |
container_volume |
32 |
container_issue |
2 |
container_start_page |
250 |
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266 |
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1787426125412040704 |