Organic matter compositions of rivers draining into Hudson Bay: Present-day trends and potential as recorders of future climate change

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dc.contributor.authorGodin, Pamela
dc.contributor.authorMacdonald, Robie W.
dc.contributor.authorKuzyk, Zou Zou A.
dc.contributor.authorGonr, Miguel A.
dc.contributor.authorStern, Gary A.
dc.date.accessioned2020-07-10T18:20:18Z
dc.date.available2020-07-10T18:20:18Z
dc.date.issued2017-07-26
dc.date.submitted2020-07-10T18:20:18Zen_US
dc.description.abstractConcentrations and compositions of particulate and dissolved organic carbon (POC and DOC, respectively) and aromatic compounds including lignin were analyzed in water samples from 17 rivers flowing into Hudson Bay, northern Canada. These rivers incorporate basins to the south with no permafrost to basins in the north with continuous permafrost, and dominant vegetation systems that include Boreal Forest, the Hudson Plains, Taiga Shield, and Tundra. Major latitudinal trends in organic carbon and lignin concentrations and compositions were evident, with both DOC and dissolved lignin concentrations dominating over their particulate counterparts and exhibiting significant correlations with total dissolved and suspended solids, respectively. The composition of lignin reaction products in terms of the syringyl, cinnamyl, and vanillyl compositions indicate mixed sources of vascular land plant-derived organic carbon, with woody gymnosperms contributions dominating in the southern river basins whereas nonwoody angiosperm sources were more important in the most northerly rivers. The composition of nonlignin aromatic compounds, which provides a tracer for nonvascular plant contributions, suggests stronger contributions from Sphagnum mosses to dissolved organic matter in rivers below the tree line, including those with large peat bogs in their basins. Acid/aldehyde ratios of the lignin products together with Δ14C data for DOC in selected rivers indicate that DOC has generally undergone greater alteration than POC. Interestingly, several northern rivers exhibited relatively old DOC according to the Δ14C data suggesting that either old DOC is being released from permafrost or old DOC survives river transport in these rivers.en_US
dc.identifier.citationGodin, P., R. W. Macdonald, Z. Z. A. Kuzyk, M. A. Goñi, and G. A. Stern (2017), Organic matter compositions of rivers draining into Hudson Bay: Present-day trends and potential as recorders of future climate change, J. Geophys. Res. Biogeosci., 122, 1848–1869, doi:10.1002/2016JG003569.en_US
dc.identifier.doihttps://doi.org/10.1002/2016JG003569
dc.identifier.urihttp://hdl.handle.net/1993/34773
dc.language.isoengen_US
dc.publisherAmerican Geophysical Unionen_US
dc.rightsopen accessen_US
dc.subjectOrganic Matteren_US
dc.subjectRiver drainageen_US
dc.subjectHudson Bayen_US
dc.subjectClimate Changeen_US
dc.subjectOrganic Carbonen_US
dc.titleOrganic matter compositions of rivers draining into Hudson Bay: Present-day trends and potential as recorders of future climate changeen_US
dc.typeTechnical Reporten_US
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