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dc.contributor.authorAarnos, Hanna
dc.contributor.authorGélinas, Yves
dc.contributor.authorKasurinen, Ville
dc.contributor.authorGu, Yufei
dc.contributor.authorPuupponen, Veli-Mikko
dc.contributor.authorVähätalo, Anssi
dc.date.accessioned2018-03-09T06:48:05Z
dc.date.available2018-03-09T06:48:05Z
dc.date.issued2018
dc.identifier.citationAarnos, H., Gélinas, Y., Kasurinen, V., Gu, Y., Puupponen, V.-M., & Vähätalo, A. (2018). Photochemical mineralization of terrigenous DOC to dissolved inorganic carbon in ocean. <i>Global Biogeochemical Cycles</i>, <i>32</i>(2), 250-266. <a href="https://doi.org/10.1002/2017GB005698" target="_blank">https://doi.org/10.1002/2017GB005698</a>
dc.identifier.otherCONVID_27874949
dc.identifier.otherTUTKAID_76666
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/57282
dc.description.abstractWhen 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.
dc.language.isoeng
dc.publisherAmerican Geophysical Union
dc.relation.ispartofseriesGlobal Biogeochemical Cycles
dc.subject.otherDOC
dc.subject.otherCDOM
dc.subject.otherocean
dc.titlePhotochemical mineralization of terrigenous DOC to dissolved inorganic carbon in ocean
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-201803071671
dc.contributor.laitosBio- ja ympäristötieteiden laitosfi
dc.contributor.laitosDepartment of Biological and Environmental Scienceen
dc.contributor.oppiaineYmpäristötiedefi
dc.contributor.oppiaineEnvironmental Scienceen
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.date.updated2018-03-07T13:15:03Z
dc.description.reviewstatuspeerReviewed
dc.format.pagerange250-266
dc.relation.issn0886-6236
dc.relation.numberinseries2
dc.relation.volume32
dc.type.versionacceptedVersion
dc.rights.copyright© 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.
dc.rights.accesslevelopenAccessfi
dc.subject.ysoliuennut orgaaninen hiili
dc.subject.ysojoet
dc.subject.ysohiili
dc.subject.ysomeret
dc.subject.ysovalokemia
jyx.subject.urihttp://www.yso.fi/onto/yso/p29461
jyx.subject.urihttp://www.yso.fi/onto/yso/p3259
jyx.subject.urihttp://www.yso.fi/onto/yso/p138
jyx.subject.urihttp://www.yso.fi/onto/yso/p8444
jyx.subject.urihttp://www.yso.fi/onto/yso/p7201
dc.relation.doi10.1002/2017GB005698


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