Geochemistry of Arctic marine sediments
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2011
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| _version_ | 1867169122874294272 |
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| author | Kim, Jung-Hyun Peterse, Francien Willmott, Verónica Klitgaard-Kristensen, Dorthe Baas, Marianne Schouten, Stefan Sinninghe Damsté, Jaap S |
| author_facet | Kim, Jung-Hyun Peterse, Francien Willmott, Verónica Klitgaard-Kristensen, Dorthe Baas, Marianne Schouten, Stefan Sinninghe Damsté, Jaap S |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Soils, fine-grained ice-rafted detritus (IRD), coals, and marine surface sediments in the Arctic realm (Svalbard) were collected in 2007 and 2008 to characterize organic matter (OM) sources in Arctic marine sediments. Bulk geochemical (C:N ratio and stable carbon isotopic composition) parameters suggest a predominant marine contribution to sedimentary OM. The branched and isoprenoid tetraether index (a proxy of soil OM input) indicates that soil OM contribution to the marine sediments is minor. However, the presence of retene (used as an indicator for coal-derived OM), the low carbon preference index and the average chain length of n-alkanes, and the depleted bulk radiocarbon content (D14C value) suggest that ancient OM of both coal-derived and mature IRD-derived OM is being buried in the Kongsfjord-Krossfjord system of Svalbard in the high Arctic. The relatively low retene concentrations in the marine surface sediments other than those in close vicinity of Ny Ålesund, previously a coal-mining town, indicated that input of IRD-derived OM was predominantly responsible for the generally low D14C value. We applied three-end-member models based on D14C and retene and n-alkane concentration data to disentangle relative coal-derived, IRD-derived, and marine OM proportions to sedimentary OM. Sediments were comprised on average 2% ± 4% of coal-derived OM, 37% ± 17% of IRD-derived OM, and 61% ± 18% of marine OM with higher IRD-derived OM deposit in the Kongsvegen glacier front. Our results highlight the important role of ancient OM on carbon dynamics in Arctic environments, in particular for benthic food webs. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_882412 |
| institution | PANGAEA |
| language | en |
| publishDate | 2011 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Geochemistry of Arctic marine sediments Kim, Jung-Hyun Peterse, Francien Willmott, Verónica Klitgaard-Kristensen, Dorthe Baas, Marianne Schouten, Stefan Sinninghe Damsté, Jaap S Arctic Ocean; Area/locality; AWIPEV; AWIPEV_based; Barents Sea; Carbon, organic, total; Carbon, organic, total, standard deviation; Carbon, total; Carbon, total, standard deviation; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Event label; LA07/9; Lance; Latitude of event; Lilliehookbreen-1; Lilliehookbreen-2; Lithology/composition/facies; Longitude of event; Mitra-Peninsula-1; Mitra-Peninsula-2; Mitra-Peninsula-3; Mitra-Peninsula-4; Mitra-Peninsula-5; MUC; MULT; MultiCorer; Multiple investigations; NIOZ_UU; NIOZ Royal Netherlands Institute for Sea Research, and Utrecht University; Nitrogen, total; Nitrogen, total, standard deviation; NP-07-13-08; NP-07-13-09; NP-07-13-10; NP-07-13-11; NP-07-13-13; NP-07-13-14; NP-07-13-15; NP-07-13-16; NP-07-13-21; NP-07-13-23; NP-07-13-24; NP-07-13-25; NP-07-13-26; NP-07-13-30; NP-07-13-31; NP-07-13-32; NP-07-13-33; NP-07-13-34; NP-07-13-35; NP-07-13-36; NP-07-13-40; NP-07-13-41; NP-07-13-42; NP-07-13-44; NP-07-13-46; NP-07-13-47; NP-07-13-48; NP-07-13-49; NP-07-13-50; NP-07-13-51; NP-07-13-52; NP-07-13-53; NP-07-13-55; NP-07-13-60; NP-07-13-61; NP-07-13-64; Ny-Alesund-1; Ny-Alesund-2; Ny-Alesund-3; Ny-Alesund-4; Spitsbergen; δ13C, organic carbon; δ13C, organic carbon, standard deviation Soils, fine-grained ice-rafted detritus (IRD), coals, and marine surface sediments in the Arctic realm (Svalbard) were collected in 2007 and 2008 to characterize organic matter (OM) sources in Arctic marine sediments. Bulk geochemical (C:N ratio and stable carbon isotopic composition) parameters suggest a predominant marine contribution to sedimentary OM. The branched and isoprenoid tetraether index (a proxy of soil OM input) indicates that soil OM contribution to the marine sediments is minor. However, the presence of retene (used as an indicator for coal-derived OM), the low carbon preference index and the average chain length of n-alkanes, and the depleted bulk radiocarbon content (D14C value) suggest that ancient OM of both coal-derived and mature IRD-derived OM is being buried in the Kongsfjord-Krossfjord system of Svalbard in the high Arctic. The relatively low retene concentrations in the marine surface sediments other than those in close vicinity of Ny Ålesund, previously a coal-mining town, indicated that input of IRD-derived OM was predominantly responsible for the generally low D14C value. We applied three-end-member models based on D14C and retene and n-alkane concentration data to disentangle relative coal-derived, IRD-derived, and marine OM proportions to sedimentary OM. Sediments were comprised on average 2% ± 4% of coal-derived OM, 37% ± 17% of IRD-derived OM, and 61% ± 18% of marine OM with higher IRD-derived OM deposit in the Kongsvegen glacier front. Our results highlight the important role of ancient OM on carbon dynamics in Arctic environments, in particular for benthic food webs. |
| title | Geochemistry of Arctic marine sediments |
| topic | Arctic Ocean; Area/locality; AWIPEV; AWIPEV_based; Barents Sea; Carbon, organic, total; Carbon, organic, total, standard deviation; Carbon, total; Carbon, total, standard deviation; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Event label; LA07/9; Lance; Latitude of event; Lilliehookbreen-1; Lilliehookbreen-2; Lithology/composition/facies; Longitude of event; Mitra-Peninsula-1; Mitra-Peninsula-2; Mitra-Peninsula-3; Mitra-Peninsula-4; Mitra-Peninsula-5; MUC; MULT; MultiCorer; Multiple investigations; NIOZ_UU; NIOZ Royal Netherlands Institute for Sea Research, and Utrecht University; Nitrogen, total; Nitrogen, total, standard deviation; NP-07-13-08; NP-07-13-09; NP-07-13-10; NP-07-13-11; NP-07-13-13; NP-07-13-14; NP-07-13-15; NP-07-13-16; NP-07-13-21; NP-07-13-23; NP-07-13-24; NP-07-13-25; NP-07-13-26; NP-07-13-30; NP-07-13-31; NP-07-13-32; NP-07-13-33; NP-07-13-34; NP-07-13-35; NP-07-13-36; NP-07-13-40; NP-07-13-41; NP-07-13-42; NP-07-13-44; NP-07-13-46; NP-07-13-47; NP-07-13-48; NP-07-13-49; NP-07-13-50; NP-07-13-51; NP-07-13-52; NP-07-13-53; NP-07-13-55; NP-07-13-60; NP-07-13-61; NP-07-13-64; Ny-Alesund-1; Ny-Alesund-2; Ny-Alesund-3; Ny-Alesund-4; Spitsbergen; δ13C, organic carbon; δ13C, organic carbon, standard deviation |
| url | https://doi.org/10.1594/PANGAEA.882412 |