Quantification of Discharge-Specific Effects on Dissolved Organic Matter Export From Major Arctic Rivers From 1982 Through 2019

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dc.contributor.authorClark, Blake
dc.contributor.authorMannino, Antonio
dc.contributor.authorSpencer, Robert G. M.
dc.contributor.authorTank, Suzanne E.
dc.contributor.authorMcClelland, James W.
dc.date.accessioned2023-09-01T20:25:55Z
dc.date.available2023-09-01T20:25:55Z
dc.date.issued2023-08-13
dc.description.abstractLong-term increases in Arctic river discharge have been well documented, and observations in the six largest Arctic rivers show strong positive correlations between dissolved organic carbon (DOC) concentration, river discharge, and chromophoric dissolved organic matter (CDOM) content. Here, observations of DOC and CDOM collected from 2009 to 2019 by the Arctic Great Rivers Observatory were used to estimate chromophoric DOC (CDOC) concentrations in the Kolyma, Lena, Mackenzie, Ob', Yenisey, and Yukon Rivers. All rivers except the Mackenzie showed significant positive correlations between annual watershed runoff and the proportion of the DOC that is chromophoric. Historical estimates of DOC and CDOC export were calculated for 1982–2019 by extrapolating the DOC and CDOC concentration—discharge relationships from 2009 to 2019 as a hindcast modeled estimate. For the six rivers combined, modeled DOC and CDOC exports increased, but CDOC increased faster than total DOC. The Lena and Ob' Rivers showed significant increases in DOC export individually, with annual trends of 39.1 and 20.4 Gg C yr⁻¹ respectively. November–April (winter) DOC and CDOC exports increased in all rivers but the Yenisey, with the hindcast winter Kolyma export increasing by more than 20% per decade. There were no significant trends in discharge or associated DOC and CDOC fluxes during the observational period from 2009 to 2019; only when hindcasted values driven by changes in river discharge were analyzed did trends in DOC and CDOC emerge. This demonstrates how shifting seasonal distributions and increases in discharge can drive changes in DOC and CDOC concentrations and exports independent of other environmental factors.en_US
dc.description.sponsorshipWe acknowledge the Arctic Great Rivers Observatory and the data sets provided and publicly available; without them none of this analysis would have been possible. We acknowledge Max Holmes for advice in the initial conceptualization of this paper. JB Clark acknowledges the NASA Postdoctoral Program from which this study was initiated during his fellowship at NASA Goddard Space Flight Center in the Ocean Ecology Laboratory. We also acknowledge Julien Fouché and an anonymous reviewer for their comments and suggestions to improve this manuscript. The ArcticGRO project has been supported under US NSF Grants 0732985, 0732821, 0732522, 0732583, 1107774, 1603149, 1602680, 1602615, 1914081, 1914215, 1913888, and 2230812.en_US
dc.description.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2023GB007854en_US
dc.format.extent16 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2ujmq-nkqi
dc.identifier.citationClark, J. Blake, Antonio Mannino, Robert G. M. Spencer, Suzanne E. Tank, and James W. McClelland. “Quantification of Discharge-Specific Effects on Dissolved Organic Matter Export From Major Arctic Rivers From 1982 Through 2019.” Global Biogeochemical Cycles 37, no. 8 (2023): e2023GB007854. https://doi.org/10.1029/2023GB007854.en_US
dc.identifier.urihttps://doi.org/10.1029/2023GB007854
dc.identifier.urihttp://hdl.handle.net/11603/29529
dc.language.isoen_USen_US
dc.publisherAGUen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC GESTAR II Collection
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.en_US
dc.rightsPublic Domain Mark 1.0*
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleQuantification of Discharge-Specific Effects on Dissolved Organic Matter Export From Major Arctic Rivers From 1982 Through 2019en_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0002-8454-1458en_US

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