Effect of terrestrial organic matter on ocean acidification and CO2 flux in an Arctic shelf sea

dc.contributor.authorCapelle, David W.
dc.contributor.authorKuzyk, Zou Zou A.
dc.contributor.authorPapakyriakou, Tim
dc.contributor.authorGueguen, Celine
dc.contributor.authorMiller, Lisa A.
dc.contributor.authorMacdonald, Robie W.
dc.date.accessioned2020-07-10T15:46:42Z
dc.date.available2020-07-10T15:46:42Z
dc.date.issued2020-04-10
dc.date.submitted2020-07-10T15:46:42Zen_US
dc.description.abstractRecent research has focused on the changing ability of oceans to absorb atmospheric CO2 and the consequences for ocean acidification, with Arctic shelf seas being among the most sensitive regions. Hudson Bay is a large shelf sea in northern Canada whose location at the margin of the cryosphere places it in the vanguard of global climate change. Here, we develop a four-compartment box-model and carbon budget using published and recently collected measurements to estimate carbon inputs, transformations, and losses within Hudson Bay. We estimate the annual effects of terrestrial carbon remineralization on aragonite saturation (ΩAr, a proxy for ocean acidification) and on the partial pressure of CO2 (pCO2, a proxy for air-sea CO2 flux) within each compartment, as well as the effects of marine primary production, marine organic carbon remineralization, and terrestrial calcium carbonate dissolution. We find that the remineralization of terrestrial dissolved organic carbon is the main driver of CO2 accumulation and aragonite under-saturation in coastal surface waters, but this is largely offset by marine primary production. Below the surface mixed layer, marine organic carbon remineralization is the largest contributor to CO2 accumulation and aragonite under-saturation, and is partially offset by terrestrial CaCO3 dissolution. Overall, the annual delivery and processing of carbon reduces ΩAr of water flowing through HB by up to 0.17 units and raises pCO2 by up to 165 μatm. The similarities between Hudson Bay and other Arctic shelf seas suggest these areas are also significantly influenced by terrestrial carbon inputs and transformation.en_US
dc.identifier.citationDavid W. Capelle, Zou Zou A. Kuzyk, Tim Papakyriakou, Céline Guéguen, Lisa A. Miller, Robie W. Macdonald, Effect of terrestrial organic matter on ocean acidification and CO2 flux in an Arctic shelf sea, Progress in Oceanography, Volume 185, 2020, 102319, ISSN 0079-6611, https://doi.org/10.1016/j.pocean.2020.102319.en_US
dc.identifier.doi10.1016/j.pocean.2020.102319
dc.identifier.urihttp://hdl.handle.net/1993/34767
dc.language.isoengen_US
dc.publisherElsevier Ltd.en_US
dc.rightsopen accessen_US
dc.subjectAragoniteen_US
dc.subjectCarbon-cycleen_US
dc.subjectCarbon-dioxideen_US
dc.subjectArcticen_US
dc.subjectOcean acidificationen_US
dc.titleEffect of terrestrial organic matter on ocean acidification and CO2 flux in an Arctic shelf seaen_US
dc.typeTechnical Reporten_US
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