PANGAEA_982609 The highly branched isoprenoid and the open-water phytoplankton biomarker analysis of sediment core SL170 from Baffin Bay You, Defang; Stein, Ruediger; Lohmann, Gerrit; Masoum, Ahmadreza; Fahl, Kirsten; Wu, Junjie; Jackson, Rebecca The highly branched isoprenoid and the open-water phytoplankton biomarker analysis of sediment core SL170 from Baffin Bay 2025-11-13 PANGAEA Dataset https://doi.pangaea.de/10.1594/PANGAEA.982609 Investigator Defang You defang.you@geow.uni-heidelberg.de Earth Science DEPTH, sediment/rock AGE 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane, per unit mass total organic carbon 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, per unit mass total organic carbon Phytoplankton biomarker Dinosterol IP25 index geoscientificInformation Baffin Bay Biomarkers GeoTü SL 170 Gravity corer MSM09/2 MSM09/2_455-13 Primary production Sea ice Gas chromatography - Mass spectrometry (GC-MS) Calculated Maria S. Merian 2008-09-05 2008-09-05 Complete 68.9692 68.9692 -59.393 -59.393 0.005 m (DEPTH, sediment/rock) 6.765 m (DEPTH, sediment/rock) unrestricted CC-BY-4.0: Creative Commons Attribution 4.0 International English PANGAEA Data Publisher for Earth & Environmental Science https://www.pangaea.de/ Data Center Contact Michael Diepenbroek info@pangaea.de

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Bremen Bremen 28359 Germany online 269 data points text/tab-separated-values You, Defang; Stein, Ruediger; Lohmann, Gerrit; Masoum, Ahmadreza; Fahl, Kirsten; Wu, Junjie; Jackson, Rebecca (2026): Surface freshening in the subpolar North Atlantic sustaining the weakened AMOC during the late Younger Dryas. Science Advances, 12(1), eadv6220, https://doi.org/10.1126/sciadv.adv6220

This dataset presents biomarker records from sediment core SL170 (MSM09/02-0455/13; 68°58.15′ N, 59°23.58′ W; 1078 m water depth), recovered from eastern Baffin Bay during the MSM09/02 expedition of R/V Maria S. Merian. The highly branched isoprenoid (IP25) and the open-water phytoplankton biomarker (dinosterol) were analysed to reconstruct past sea ice algal productivity and primary production, respectively, covering the period from ~17,000 to 10,000 years BP. The PDIP25 index was further calculated to provide semi-quantitative estimates of past sea ice cover. Biomarker analyses were carried out at the Alfred Wegener Institute, Bremerhaven. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.982609"! ** This dataset includes concentrations of IP25 and dinosterol from sediment core SL170 (Baffin Bay), covering the period from 17,000 to 10,000 years BP. IP25 concentrations reflect sea ice algal productivity, while dinosterol serves as an indicator of open-water phytoplankton productivity. Based on these biomarker concentrations, the PDIP25 index was calculated to provide semi-quantitative estimates of past sea ice cover. For intervals in which either the IP25 or the dinosterol levels are zero or very low, the PDIP25 values are indeterminable and are not displayed in the data set.

http://en.wikipedia.org/wiki/Kyr AGE https://doi.org/10.1126/sciadv.adv6220 Surface freshening in the subpolar North Atlantic sustaining the weakened AMOC during the late Younger Dryas https://en.wikipedia.org/wiki/RV_Maria_S._Merian Maria S. Merian DIF 9.4 2025-11-13 2026-04-29