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Article: Origin and fate of particulate organic matter in the southern Beaufort Sea - Amundsen Gulf region, Canadian Arctic

TitleOrigin and fate of particulate organic matter in the southern Beaufort Sea - Amundsen Gulf region, Canadian Arctic
Authors
Keywordscarbon
Beaufort Sea
stable isotopes
Arctic ocean
Mackenzie Shelf
organic matter
nitrogen
Amundsen Gulf
sediment
Issue Date2010
Citation
Estuarine, Coastal and Shelf Science, 2010, v. 86, n. 1, p. 31-41 How to Cite?
AbstractTo establish the relative importance of terrigenous and marine organic matter in the southern Beaufort Sea, we measured the concentrations and the stable isotopic compositions of organic carbon and total nitrogen in sediments and in settling particles intercepted by sediment traps. The organic carbon content of surface sediment in the Chukchi and southern Beaufort Seas ranged from 0.6 to 1.6% dry wt., without a clear geographical pattern. The CORG:NTOT ratio ranged from 7.0 to 10.4 and did not vary significantly downcore at any one station. Values of δ13CORG and δ15NTOT in the sediment samples were strongly correlated, with the highest values, indicative of a more marine contribution, in the Amundsen Gulf. In contrast, the organic matter content, elemental (CORG:NTOT ratio) and isotopic (δ13CORG and δ15NTOT) composition of the settling particles was different from and much more variable than in the bottom sediments. The isotopic signature of organic matter in the Beaufort Sea is well constrained by three distinct end-members: a labile marine component produced in situ by planktonic organisms, a refractory marine component, the end product of respiration and diagenesis, and a refractory terrigenous component. A three-component mixing model explains the scatter observed in the stable isotope signatures of the sediment trap samples and accommodates an apparent two-component mixing model of the organic matter in sediments. The suspended matter in the water column contains organic matter varying from essentially labile and marine to mostly refractory and terrigenous. As it settles through the water column, the labile marine organic matter is degraded, and its original stable isotope signature changes towards the signature of the marine refractory component. This process continues in the bottom sediment with the result that the sedimentary organic matter becomes dominated by the refractory terrigenous and marine components. © 2009 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/269688
ISSN
2023 Impact Factor: 2.6
2023 SCImago Journal Rankings: 0.760
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorMagen, Cédric-
dc.contributor.authorChaillou, Gwénaëlle-
dc.contributor.authorCrowe, Sean A.-
dc.contributor.authorMucci, Alfonso-
dc.contributor.authorSundby, Bjørn-
dc.contributor.authorGao, Aiguo-
dc.contributor.authorMakabe, Ryosuke-
dc.contributor.authorSasaki, Hiroshi-
dc.date.accessioned2019-04-30T01:49:18Z-
dc.date.available2019-04-30T01:49:18Z-
dc.date.issued2010-
dc.identifier.citationEstuarine, Coastal and Shelf Science, 2010, v. 86, n. 1, p. 31-41-
dc.identifier.issn0272-7714-
dc.identifier.urihttp://hdl.handle.net/10722/269688-
dc.description.abstractTo establish the relative importance of terrigenous and marine organic matter in the southern Beaufort Sea, we measured the concentrations and the stable isotopic compositions of organic carbon and total nitrogen in sediments and in settling particles intercepted by sediment traps. The organic carbon content of surface sediment in the Chukchi and southern Beaufort Seas ranged from 0.6 to 1.6% dry wt., without a clear geographical pattern. The CORG:NTOT ratio ranged from 7.0 to 10.4 and did not vary significantly downcore at any one station. Values of δ13CORG and δ15NTOT in the sediment samples were strongly correlated, with the highest values, indicative of a more marine contribution, in the Amundsen Gulf. In contrast, the organic matter content, elemental (CORG:NTOT ratio) and isotopic (δ13CORG and δ15NTOT) composition of the settling particles was different from and much more variable than in the bottom sediments. The isotopic signature of organic matter in the Beaufort Sea is well constrained by three distinct end-members: a labile marine component produced in situ by planktonic organisms, a refractory marine component, the end product of respiration and diagenesis, and a refractory terrigenous component. A three-component mixing model explains the scatter observed in the stable isotope signatures of the sediment trap samples and accommodates an apparent two-component mixing model of the organic matter in sediments. The suspended matter in the water column contains organic matter varying from essentially labile and marine to mostly refractory and terrigenous. As it settles through the water column, the labile marine organic matter is degraded, and its original stable isotope signature changes towards the signature of the marine refractory component. This process continues in the bottom sediment with the result that the sedimentary organic matter becomes dominated by the refractory terrigenous and marine components. © 2009 Elsevier Ltd. All rights reserved.-
dc.languageeng-
dc.relation.ispartofEstuarine, Coastal and Shelf Science-
dc.subjectcarbon-
dc.subjectBeaufort Sea-
dc.subjectstable isotopes-
dc.subjectArctic ocean-
dc.subjectMackenzie Shelf-
dc.subjectorganic matter-
dc.subjectnitrogen-
dc.subjectAmundsen Gulf-
dc.subjectsediment-
dc.titleOrigin and fate of particulate organic matter in the southern Beaufort Sea - Amundsen Gulf region, Canadian Arctic-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.ecss.2009.09.009-
dc.identifier.scopuseid_2-s2.0-72149104337-
dc.identifier.volume86-
dc.identifier.issue1-
dc.identifier.spage31-
dc.identifier.epage41-
dc.identifier.isiWOS:000273705000007-
dc.identifier.issnl0272-7714-

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