title: The deep permafrost carbon pool of the Yedoma region in Siberia and Alaska.
abstract: [1] Estimates for circumpolar permafrost organic carbon (OC) storage suggest that this pool contains twice the amount of current atmospheric carbon. The Yedoma region sequestered substantial quantities of OC and is unique because its deep OC, which was incorporated into permafrost during ice age conditions. Rapid inclusion of labile organic matter into permafrost halted decomposition and resulted in a deep long-term sink. We show that the deep frozen OC in the Yedoma region consists of two distinct major subreservoirs: Yedoma deposits (late Pleistocene ice- and organic-rich silty sediments) and deposits formed in thaw-lake basins (generalized as thermokarst deposits). We quantified the OC pool based on field data and extrapolation using geospatial data sets to 83 + 61/-57 Gt for Yedoma deposits and to 128 + 99/-96 Gt for thermokarst deposits. The total Yedoma region 211 + 160/-153 Gt is a substantial amount of thaw-vulnerable OC that must be accounted for in global models.
authors.affiliation: Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Periglacial Research Unit Potsdam, Germany.
authors.forename: Jens
authors.initials: J
authors.lastname: Strauss
authors.affiliation: Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Periglacial Research Unit Potsdam, Germany.
authors.forename: Lutz
authors.initials: L
authors.lastname: Schirrmeister
authors.affiliation: Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Periglacial Research Unit Potsdam, Germany ; Geophysical Institute, University of Alaska Fairbanks Fairbanks, USA.
authors.forename: Guido
authors.initials: G
authors.lastname: Grosse
authors.affiliation: Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Periglacial Research Unit Potsdam, Germany.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Wetterich
authors.affiliation: Institute for Geography, Leipzig University Leipzig, Germany.
authors.forename: Mathias
authors.initials: M
authors.lastname: Ulrich
authors.affiliation: Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Periglacial Research Unit Potsdam, Germany.
authors.forename: Ulrike
authors.initials: U
authors.lastname: Herzschuh
authors.affiliation: Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Periglacial Research Unit Potsdam, Germany.
authors.forename: Hans-Wolfgang
authors.initials: HW
authors.lastname: Hubberten
keywords: Arctic; Yedoma; carbon cycle; climate feedback; frozen organic matter; thermokarst