Biomarker distributions in surface sediments from the Kara and Laptev seas (Arctic Ocean): indicators for organic-carbon sources and sea-ice coverage
Studies of spatial and temporal changes in modern and past sea-ice occurrence may help to understand the processes controlling the recent decrease in Arctic sea-ice cover. Here, we determined concentrations of IP25, a novel biomarker proxy for sea ice developed in recent years, phytoplankton-derived...
Published in: | Quaternary Science Reviews |
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Online Access: | https://oceanrep.geomar.de/id/eprint/25442/ https://doi.org/10.1016/j.quascirev.2012.11.028 |
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ftoceanrep:oai:oceanrep.geomar.de:25442 2023-05-15T14:25:46+02:00 Biomarker distributions in surface sediments from the Kara and Laptev seas (Arctic Ocean): indicators for organic-carbon sources and sea-ice coverage Xiao, Xiaotong Fahl, Kirsten Stein, Ruediger 2013 https://oceanrep.geomar.de/id/eprint/25442/ https://doi.org/10.1016/j.quascirev.2012.11.028 unknown Elsevier Xiao, X., Fahl, K. and Stein, R. (2013) Biomarker distributions in surface sediments from the Kara and Laptev seas (Arctic Ocean): indicators for organic-carbon sources and sea-ice coverage. Quaternary Science Reviews, 79 . pp. 40-52. DOI 10.1016/j.quascirev.2012.11.028 <https://doi.org/10.1016/j.quascirev.2012.11.028>. doi:10.1016/j.quascirev.2012.11.028 Article PeerReviewed 2013 ftoceanrep https://doi.org/10.1016/j.quascirev.2012.11.028 2023-04-07T15:14:04Z Studies of spatial and temporal changes in modern and past sea-ice occurrence may help to understand the processes controlling the recent decrease in Arctic sea-ice cover. Here, we determined concentrations of IP25, a novel biomarker proxy for sea ice developed in recent years, phytoplankton-derived biomarkers (brassicasterol and dinosterol) and terrigenous biomarkers (campesterol and β-sitosterol) in the surface sediments from the Kara and Laptev seas to estimate modern spatial (seasonal) sea-ice variability and organic-matter sources. C25-HBI dienes and trienes were determined as additional palaeoenvironmental proxies in the study area. Furthermore, a combined phytoplankton-IP25 biomarker approach (PIP25 index) is used to reconstruct the modern sea-ice distribution more quantitatively. The terrigenous biomarkers reach maximum concentrations in the coastal zones and estuaries, reflecting the huge discharge by the major rivers Ob, Yenisei and Lena. Maxima in phytoplankton biomarkers indicating increased primary productivity were found in the seasonally ice-free central part of the Kara and Laptev seas. Neither IP25 nor PIP25, however, shows a clear and simple correlation with satellite sea-ice distribution in our study area due to the complex environmental conditions in our study area and the transportation process of sea-ice diatom in the water column. Differences in the diene/IP25 and triene/IP25 ratios point to different sources of these HBIs and different environmental conditions. The diene/IP25 ratio seems to correlate positively with sea-surface temperature, while negatively with salinity distributions. Article in Journal/Newspaper Arctic Arctic Arctic Ocean laptev Phytoplankton Sea ice OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Arctic Arctic Ocean Quaternary Science Reviews 79 40 52 |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
unknown |
description |
Studies of spatial and temporal changes in modern and past sea-ice occurrence may help to understand the processes controlling the recent decrease in Arctic sea-ice cover. Here, we determined concentrations of IP25, a novel biomarker proxy for sea ice developed in recent years, phytoplankton-derived biomarkers (brassicasterol and dinosterol) and terrigenous biomarkers (campesterol and β-sitosterol) in the surface sediments from the Kara and Laptev seas to estimate modern spatial (seasonal) sea-ice variability and organic-matter sources. C25-HBI dienes and trienes were determined as additional palaeoenvironmental proxies in the study area. Furthermore, a combined phytoplankton-IP25 biomarker approach (PIP25 index) is used to reconstruct the modern sea-ice distribution more quantitatively. The terrigenous biomarkers reach maximum concentrations in the coastal zones and estuaries, reflecting the huge discharge by the major rivers Ob, Yenisei and Lena. Maxima in phytoplankton biomarkers indicating increased primary productivity were found in the seasonally ice-free central part of the Kara and Laptev seas. Neither IP25 nor PIP25, however, shows a clear and simple correlation with satellite sea-ice distribution in our study area due to the complex environmental conditions in our study area and the transportation process of sea-ice diatom in the water column. Differences in the diene/IP25 and triene/IP25 ratios point to different sources of these HBIs and different environmental conditions. The diene/IP25 ratio seems to correlate positively with sea-surface temperature, while negatively with salinity distributions. |
format |
Article in Journal/Newspaper |
author |
Xiao, Xiaotong Fahl, Kirsten Stein, Ruediger |
spellingShingle |
Xiao, Xiaotong Fahl, Kirsten Stein, Ruediger Biomarker distributions in surface sediments from the Kara and Laptev seas (Arctic Ocean): indicators for organic-carbon sources and sea-ice coverage |
author_facet |
Xiao, Xiaotong Fahl, Kirsten Stein, Ruediger |
author_sort |
Xiao, Xiaotong |
title |
Biomarker distributions in surface sediments from the Kara and Laptev seas (Arctic Ocean): indicators for organic-carbon sources and sea-ice coverage |
title_short |
Biomarker distributions in surface sediments from the Kara and Laptev seas (Arctic Ocean): indicators for organic-carbon sources and sea-ice coverage |
title_full |
Biomarker distributions in surface sediments from the Kara and Laptev seas (Arctic Ocean): indicators for organic-carbon sources and sea-ice coverage |
title_fullStr |
Biomarker distributions in surface sediments from the Kara and Laptev seas (Arctic Ocean): indicators for organic-carbon sources and sea-ice coverage |
title_full_unstemmed |
Biomarker distributions in surface sediments from the Kara and Laptev seas (Arctic Ocean): indicators for organic-carbon sources and sea-ice coverage |
title_sort |
biomarker distributions in surface sediments from the kara and laptev seas (arctic ocean): indicators for organic-carbon sources and sea-ice coverage |
publisher |
Elsevier |
publishDate |
2013 |
url |
https://oceanrep.geomar.de/id/eprint/25442/ https://doi.org/10.1016/j.quascirev.2012.11.028 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Arctic Ocean laptev Phytoplankton Sea ice |
genre_facet |
Arctic Arctic Arctic Ocean laptev Phytoplankton Sea ice |
op_relation |
Xiao, X., Fahl, K. and Stein, R. (2013) Biomarker distributions in surface sediments from the Kara and Laptev seas (Arctic Ocean): indicators for organic-carbon sources and sea-ice coverage. Quaternary Science Reviews, 79 . pp. 40-52. DOI 10.1016/j.quascirev.2012.11.028 <https://doi.org/10.1016/j.quascirev.2012.11.028>. doi:10.1016/j.quascirev.2012.11.028 |
op_doi |
https://doi.org/10.1016/j.quascirev.2012.11.028 |
container_title |
Quaternary Science Reviews |
container_volume |
79 |
container_start_page |
40 |
op_container_end_page |
52 |
_version_ |
1766298223724462080 |