Аннотация:Ice-rich permafrost in the circum-Arctic and sub-Arctic (hereafter pan-Arctic), such as latePleistocene Yedoma, are especially prone to degradation due to climate change or humanactivity. When Yedoma deposits thaw, large amounts of frozen organic matter andbiogeochemically relevant elements return into current biogeochemical cycles. Thismobilization of elements has local and global implications: increased thaw inthermokarst or thermal erosion settings enhances greenhouse gas fluxes frompermafrost regions. In addition, this ice-rich ground is of special concern forinfrastructure stability as the terrain surface settles along with thawing. Finally,understanding the distribution of the Yedoma domain area provides a window into thePleistocene past and allows reconstruction of Ice Age environmental conditions and pastmammoth-steppe landscapes. Therefore, a detailed assessment of the current pan-ArcticYedoma coverage is of importance to estimate its potential contribution to permafrostclimatefeedbacks, assess infrastructure vulnerabilities, and understand pastenvironmental and permafrost dynamics. Building on previous mapping efforts, theobjective of this paper is to compile the first digital pan-Arctic Yedoma map andspatial database of Yedoma coverage. Therefore, we 1) synthesized, analyzed, anddigitized geological and stratigraphical maps allowing identification of Yedomaoccurrence at all available scales, and 2) compiled field data and expert knowledge forcreating Yedoma map confidence classes. We used GIS-techniques to vectorize mapsand harmonize site information based on expert knowledge. We included a range ofattributes for Yedoma areas based on lithological and stratigraphic information from the source maps and assigned three different confidence levels of the presence of Yedoma(confirmed, likely, or uncertain). Using a spatial buffer of 20 km around mapped Yedomaoccurrences, we derived an extent of the Yedoma domain. Our result is a vector-basedmap of the current pan-Arctic Yedoma domain that covers approximately 2,587,000 km2,whereas Yedoma deposits are found within 480,000 km2 of this region. We estimate that35% of the total Yedoma area today is located in the tundra zone, and 65% in the taigazone. With this Yedoma mapping, we outlined the substantial spatial extent of latePleistocene Yedoma deposits and created a unique pan-Arctic dataset includingconfidence estimates.