Revisiting the disappearance of terrestrial dissolved organic matter in the ocean: A δ13C study
Lalonde, K., Vähätalo, A., & Gélinas, Y. (2014). Revisiting the disappearance of terrestrial dissolved organic matter in the ocean: A δ13C study. Biogeosciences, 11(13), 3707-3719. https://doi.org/10.5194/bg-11-3707-2014
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BiogeosciencesDate
2014Copyright
© Authors 2014. This work is distributed
under the Creative Commons Attribution 3.0 License.
Abstract.
Organic carbon (OC) depleted in
13
C is a widely
used tracer for terrestrial organic matter (OM) in aquatic sys-
tems. Photochemical reactions can, however, change
δ
13
C
of dissolved organic carbon (DOC) when chromophoric,
aromatic-rich terrestrial OC is selectively mineralized. We
assessed the robustness of the
δ
13
C signature of DOC
(
δ
13
C
DOC
) as a tracer for terrestrial OM by estimating its
change during the photobleaching of chromophoric DOM
(CDOM) from 10 large rivers. These rivers cumulatively ac-
count for approximately one-third of the world’s freshwater
discharge to the global ocean. Photobleaching of CDOM by
simulated solar radiation was associated with the photochem-
ical mineralization of 16 to 43 % of the DOC and, by prefer-
entially removing compounds depleted in
13
C, caused a 1 to
2.9 ‰ enrichment in
δ
13
C in the residual DOC. Such solar-
radiation-induced photochemical isotopic shift could bias the
calculations of terrestrial OM discharge in coastal oceans to-
wards the marine end-member. Shifts in terrestrial
δ
13
C
DOC
should be taken into account when constraining the terres-
trial end-member in global calculation of terrestrially derived
DOM in the world ocean.
...
Publisher
Copernicus GmbH; European Geosciences UnionISSN Search the Publication Forum
1726-4170Keywords
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https://converis.jyu.fi/converis/portal/detail/Publication/23786213
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Except where otherwise noted, this item's license is described as © Authors 2014. This work is distributed
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