10.1594/PANGAEA.971246Giest, FriedaFriedaGiest0000-0002-9252-6231Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, PotsdamJenrich, MarenMarenJenrich0000-0002-1330-7461Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, PotsdamGrosse, GuidoGuidoGrosse0000-0001-5895-2141Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, PotsdamJones, BenjaminBenjaminJonesUniversity of Alaska FairbanksMangelsdorf, KaiKaiMangelsdorfGeoForschungsZentrum PotsdamWindirsch, TorbenTorbenWindirsch0000-0002-4292-6931Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, PotsdamStrauss, JensJensStrauss0000-0003-4678-4982Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, PotsdamPANGAEA2024Biomarkercoastal thermokarstland-ocean transitionOrganic carbonPermafrostTeshekpuk LakeEvent labelLatitude of eventLongitude of eventSample IDDepth, top/minDepth, bottom/maxDEPTH, sediment/rockCarbon, totalCarbon, organic, totalNitrogen, totalCarbon, organic, total/Nitrogen, total ratioδ13C, organic carbonδ15N, organic matterMercurySIPRE corerPush corerAK-Land_2022_NorthSlopeAWI Arctic Land ExpeditionPermafrost Research (AWI_Perma)2022-04-25T00:00:00/2022-04-27T00:00:00Dataset511 data pointstext/tab-separated-valuesCreative Commons Attribution 4.0 InternationalThis dataset describes six sediment cores (12 - 219 cm length) from different landscape features in a coastal permafrost thermokarst affected landscape in the Theshekpuk Lake region in Arctic Alaska. They are located in a transect from inland to coast, to describes the transitional dynamics between terrestrial and marine permafrost and thermokarst. The cores were drilled during the Perma-X Lagoon expedition in April 2022. The three unfrozen cores from a marine (MAR, 12 cm length), an intact lagoon (LAG, 31 cm length) and a thermokarst lake (TKL, 50 cm length) site, were all sampled using a Push Corer. The three frozen cores, including upland permafrost (UPL, 203 cm length), drained thermokarst lake basin (DLB, 219 cm length) and semi-drained lagoon (SDLAG, 183 cm length) deposits, were drilled using a SIPRE Corer. The biogeochemical analysis included subsamples taken in intervals of 5–10 cm along the cores. Parameters included total carbon (TC) [wt%], total organic carbon (TOC) [wt%], total nitrogen (TN) [wt%], TOC/TN ratio, δ¹³C [‰ vs. VPDB] , δ¹⁵N [‰ vs. air raw], TOC density (TOCvol) [kg/m³], and mercury (Hg) [µg/kg].-153.708283333-153.508870.836194444470.8855861111