10.1594/PANGAEA.989275Mayers, Kyle M JKyle M JMayers0000-0001-9595-8702NORCE Norwegian Research Centre ASVollmar, Nele ManonNele ManonVollmar0000-0003-4180-3443NORCE Norwegian Research Centre ASCordier, TristanTristanCordier0000-0001-7398-4790NORCE Norwegian Research Centre ASWeiner, Agnes K MAgnes K MWeiner0000-0002-9917-5235NORCE Norwegian Research Centre ASMüller, JulianeJulianeMüller0000-0003-0724-4131Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, BremerhavenDe Schepper, StijnStijnDe Schepper0000-0002-6934-0914NORCE Norwegian Research Centre ASPANGAEA2026ArcticDinoflagellategene copy numberMagnetic susceptibilityRadiocarbonSea iceCruise/expeditionStation labelCoreSectionDEPTH, sediment/rockDepth, sectionSample IDLaboratory code/labelAGEGene copies per gram sedimentGravity corerDroplet digital polymerase chain reaction (ddPCR); DNA extracted using DNeasy PowerMax Soil Kit (Qiagen)AverageKH21-234Kronprins Haakon2021-07-07T14:42:29Dataset10.1016/j.epsl.2025.119809816 data pointstext/tab-separated-valuesCreative Commons Attribution 4.0 InternationalGene copies of the sympagic dinoflagellate Polarella glacialis were determined by droplet digital PCR on samples from marine sediment core KH21-234-34GC collected from the Yermak Plateu (81.2199280 ˚N, 2.3710955˚E ) with a gravity corer at 1011m water depth during cruise KH21-234. DNA from gravity core sediments was extracted in the NORCE ancient DNA laboratory using the DNeasy PowerMax Soil Kit (Qiagen). Primers targeting the ITS1 region of P. glacialis were used in ddPCR reactions to determine gene copies per g of sediment.2.37109554281.21992801European Research Councilhttps://doi.org/10.13039/501100000781101118519Into the Blue - Resolving past Arctic greenhouse climate (i2B)Horizon 2020https://doi.org/10.13039/501100007601818449Genetic information for Arctic sea ice study