Holocene permafrost history and cryostratigraphy in the High‐Arctic Adventdalen Valley, central Svalbard

摘要: This paper presents the history and cryostratigraphy of upper permafrost in High-Arctic Adventdalen Valley, central Svalbard. Nineteen frozen sediment cores, up to 10.7 m long, obtained at five periglacial landforms, were analysed for cryostructures, ice, carbon solute contents, grain-size distribution, 14C- OSL-dated. Spatial variability ice contents is closely related sedimentary mode aggradation. In valley bottom, saline epigenetic with pore down depths depth formed deltaic sediments since mid-Holocene; cryopegs encountered below 6 m. top 1 5 m, syngenetic quasi-syngenetic microlenticular, lenticular, suspended organic-matrix cryostructures developed due loess alluvial sedimentation colder late Holocene, which resulted burial organic material. At transition between loess, massive bodies occurred. A pingo where deltaic sediments reached surface. On hillslopes, cryostructure on solifluction sheets indicates aggradation; lobes, contrast, ice-poor. Suspended eluvial deposits reflects or formation a weathered bedrock plateau. Landform-scale spatial variations ground relate slope, rate, moisture conditions stratigraphy. Although study reveals close links Holocene landscape evolution history, our results emphasize large uncertainty using terrain surface indicators infer ground-ice upscale from core landform scale mountainous landscapes.