Biomarker distributions in surface sediments from the Kara and Laptev Seas (Arctic Ocean) ...

• Main Authors: Xiao, Xiaotong, Fahl, Kirsten, Stein, Ruediger
• Format: Dataset
• Language: English
• Published: PANGAEA 2013
• Subjects: Event label; Latitude of event; Longitude of event; Elevation of event; DEPTH, sediment/rock; Carbon, organic, total; 2,10,14-Trimethyl-6-enyl-7-3-methylpent-1-enylpentadecene, per unit mass total organic carbon; 24-Methylcholesta-5,22E-dien-3beta-ol, per unit mass total organic carbon; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, per unit mass total organic carbon; 24-Methylcholest-5-en-3beta-ol, per unit mass total organic carbon; 24-ethylcholest-5-en-3beta-ol, per unit mass total organic carbon; Phytoplankton biomarker Brassicasterol IP25 index; Phytoplankton biomarker Dinosterol IP25 index; C25 highly branched isoprenoid diene/IP25 ratio; Multiple investigations; Dredge; Bucket water sampling; MultiCorer; Giant box corer; Kasten corer; Gravity corer Kiel type; Element analyser CHN, LECO; Gas chromatography - Mass spectrometry GC-MS; Calculated; BP00; BP01; BP02; Transdrift-III; ARK-XXVI/3; ARK-XI/1; Akademik Boris Petrov; Kapitan Dranitsyn; Polarstern; Paleoenvironmental Reconstructions from Marine Sediments @ AWI AWI_Paleo; Arctic Ocean; laptev; Phytoplankton; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.803232; https://doi.pangaea.de/10.1594/PANGAEA.803232

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 ß-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 paleoenvironmental 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 ... : Supplement to: Xiao, Xiaotong; Fahl, Kirsten; Stein, Ruediger (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, 40-52 ...