Carbon sources in the Beaufort Sea revealed by molecular lipid biomarkers and compound specific isotope analysis
61 pages, 12 figures, 13 tables Molecular lipid biomarkers (hydrocarbons, alcohols, sterols and fatty acids) and compound specific isotope analysis of suspended particulate organic matter (SPM) and surface sediments of the Mackenzie Shelf and slope (Southeast Beaufort Sea, Arctic Ocean), were studie...
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ftcsic:oai:digital.csic.es:10261/62984 2024-02-11T09:55:16+01:00 Carbon sources in the Beaufort Sea revealed by molecular lipid biomarkers and compound specific isotope analysis Tolosa, Imma Fiorini, S. Gasser, Beat Martín, Jacobo Miquel, J.C. 2012-10 http://hdl.handle.net/10261/62984 https://doi.org/10.5194/bgd-9-13925-2012 en eng European Geosciences Union https://doi.org/10.5194/bgd-9-13925-2012 Biogeosciences Discussions 9: 13925–13985 (2012) 1810-6277 http://hdl.handle.net/10261/62984 doi:10.5194/bgd-9-13925-2012 1810-6285 open artículo http://purl.org/coar/resource_type/c_6501 2012 ftcsic https://doi.org/10.5194/bgd-9-13925-2012 2024-01-16T09:43:44Z 61 pages, 12 figures, 13 tables Molecular lipid biomarkers (hydrocarbons, alcohols, sterols and fatty acids) and compound specific isotope analysis of suspended particulate organic matter (SPM) and surface sediments of the Mackenzie Shelf and slope (Southeast Beaufort Sea, Arctic Ocean), were studied in summer 2009. The concentrations of the molecular lipid markers, characteristic of known organic matter sources, were grouped and used as proxies to evaluate the relative importance of fresh algal, detrital algal, fossil, C3 terrestrial plants, bacterial and zooplankton material in the sedimentary organic matter (OM). Fossil and detrital algal contributions were the major fractions of the freshwater SPM from the Mackenzie River with ~34% each of the total molecular biomarkers. Fresh algal, C3 terrestrial, bacterial and zooplanktonic components represented much lower percentages, 17, 10, 4 and < 1%, respectively. In marine SPM from the Mackenzie slope, the major contributions were fresh and detrital algal components (> 80%) with a minor contribution of fossil and C3 terrestrial biomarkers. Characterization of the sediments revealed a major sink of refractory algal material mixed with some fresh algal material, fossil hydrocarbons and a small input of C3 terrestrial sources. In particular, the sediments from the shelf and at the mouth of the Amundsen Gulf presented the highest contribution of detrital algal material (60–75%) whereas those from the slope contained the highest proportion of fossil (40%) and C3 terrestrial plant material (10%). Overall, considering that the detrital algal material is marine derived, autochthonous sources contributed more than allochthonous sources to the OM lipid pool. Using the ratio of an allochthonous biomarker (normalized to total organic carbon, TOC) found in the sediments to those measured at the river mouth water, we estimated that the fraction of terrestrial material preserved in the sediments accounted for 30–40% of the total carbon in the inner shelf sediments, 17% in ... Article in Journal/Newspaper Amundsen Gulf Arctic Arctic Ocean Beaufort Sea Mackenzie river Mackenzie Shelf Zooplankton Digital.CSIC (Spanish National Research Council) Arctic Arctic Ocean Mackenzie River |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
description |
61 pages, 12 figures, 13 tables Molecular lipid biomarkers (hydrocarbons, alcohols, sterols and fatty acids) and compound specific isotope analysis of suspended particulate organic matter (SPM) and surface sediments of the Mackenzie Shelf and slope (Southeast Beaufort Sea, Arctic Ocean), were studied in summer 2009. The concentrations of the molecular lipid markers, characteristic of known organic matter sources, were grouped and used as proxies to evaluate the relative importance of fresh algal, detrital algal, fossil, C3 terrestrial plants, bacterial and zooplankton material in the sedimentary organic matter (OM). Fossil and detrital algal contributions were the major fractions of the freshwater SPM from the Mackenzie River with ~34% each of the total molecular biomarkers. Fresh algal, C3 terrestrial, bacterial and zooplanktonic components represented much lower percentages, 17, 10, 4 and < 1%, respectively. In marine SPM from the Mackenzie slope, the major contributions were fresh and detrital algal components (> 80%) with a minor contribution of fossil and C3 terrestrial biomarkers. Characterization of the sediments revealed a major sink of refractory algal material mixed with some fresh algal material, fossil hydrocarbons and a small input of C3 terrestrial sources. In particular, the sediments from the shelf and at the mouth of the Amundsen Gulf presented the highest contribution of detrital algal material (60–75%) whereas those from the slope contained the highest proportion of fossil (40%) and C3 terrestrial plant material (10%). Overall, considering that the detrital algal material is marine derived, autochthonous sources contributed more than allochthonous sources to the OM lipid pool. Using the ratio of an allochthonous biomarker (normalized to total organic carbon, TOC) found in the sediments to those measured at the river mouth water, we estimated that the fraction of terrestrial material preserved in the sediments accounted for 30–40% of the total carbon in the inner shelf sediments, 17% in ... |
format |
Article in Journal/Newspaper |
author |
Tolosa, Imma Fiorini, S. Gasser, Beat Martín, Jacobo Miquel, J.C. |
spellingShingle |
Tolosa, Imma Fiorini, S. Gasser, Beat Martín, Jacobo Miquel, J.C. Carbon sources in the Beaufort Sea revealed by molecular lipid biomarkers and compound specific isotope analysis |
author_facet |
Tolosa, Imma Fiorini, S. Gasser, Beat Martín, Jacobo Miquel, J.C. |
author_sort |
Tolosa, Imma |
title |
Carbon sources in the Beaufort Sea revealed by molecular lipid biomarkers and compound specific isotope analysis |
title_short |
Carbon sources in the Beaufort Sea revealed by molecular lipid biomarkers and compound specific isotope analysis |
title_full |
Carbon sources in the Beaufort Sea revealed by molecular lipid biomarkers and compound specific isotope analysis |
title_fullStr |
Carbon sources in the Beaufort Sea revealed by molecular lipid biomarkers and compound specific isotope analysis |
title_full_unstemmed |
Carbon sources in the Beaufort Sea revealed by molecular lipid biomarkers and compound specific isotope analysis |
title_sort |
carbon sources in the beaufort sea revealed by molecular lipid biomarkers and compound specific isotope analysis |
publisher |
European Geosciences Union |
publishDate |
2012 |
url |
http://hdl.handle.net/10261/62984 https://doi.org/10.5194/bgd-9-13925-2012 |
geographic |
Arctic Arctic Ocean Mackenzie River |
geographic_facet |
Arctic Arctic Ocean Mackenzie River |
genre |
Amundsen Gulf Arctic Arctic Ocean Beaufort Sea Mackenzie river Mackenzie Shelf Zooplankton |
genre_facet |
Amundsen Gulf Arctic Arctic Ocean Beaufort Sea Mackenzie river Mackenzie Shelf Zooplankton |
op_relation |
https://doi.org/10.5194/bgd-9-13925-2012 Biogeosciences Discussions 9: 13925–13985 (2012) 1810-6277 http://hdl.handle.net/10261/62984 doi:10.5194/bgd-9-13925-2012 1810-6285 |
op_rights |
open |
op_doi |
https://doi.org/10.5194/bgd-9-13925-2012 |
_version_ |
1790594786839756800 |