Carbon accumulation in peatlands of West Siberia over the last 2000 years. Global Biogeochemical Cycles 23: GB1012 doi:10.1029/2007GB003112

[1] We use a network of cores from 77 peatland sites to determine controls on peat C content and peat C accumulation over the last 2000 years (since 2 ka) across Russia’s West Siberian Lowland (WSL), the world’s largest wetland region. Our results show a significant influence of fossil plant composition on peat C content, with peats dominated by Sphagnum having a lower C content. Radiocarbon-derived C accumulation since 2 ka at 23 sites is highly variable from site to site, but displays a significant N–S trend of decreasing accumulation at higher latitudes. NorthernWSL peatlands show relatively small C accumulation of 7 to 35 kg C m2 since 2 ka. In contrast, peatlands south of 60N show larger accumulation of 42 to 88 kg C m2. Carbon accumulation since 2 ka varies significantly with modern mean annual air temperature, with maximum C accumulation found between1 and 0C. Rates of apparent C accumulation since 2 ka show no significant relationship to long-term Holocene averages based on total C accumulation. A GIS-based extrapolation of our site data suggests that a substantial amount (40%) of total WSL peat C has accumulated since 2 ka, with much of this accumulation south of 60N. The large peatlands in the southern WSL may be an important component of the Eurasian terrestrial C sink, and future warming could result in a shift northward in long-termWSLC sequestration