Estimated stocks of circumpolar permafrost carbon with quantified uncertainty ranges and identified data gaps

作者：Gustaf Hugelius, Jens Strauß, Sebastian Zubrzycki, J. W. Harden, Edward A. G. Schuur, Chien‐Lu Ping, Lutz Schirrmeister, Guido Grosse, G. J. Michaelson, Charles D. Koven, Jonathan A. O’Donnell, Bo Elberling, Umakant Mishra, Philip Camill, Zicheng Yu, Juri Palmtag, Peter Kuhry · 发表于：Biogeosciences · 年份：2014 · DOI：10.5194/bg-11-6573-2014 · 被引用次数：1784 · 研究领域：Climate change and permafrost、Cryospheric studies and observations、Geology and Paleoclimatology Research

Abstract. Soils and other unconsolidated deposits in the northern circumpolar permafrost region store large amounts of soil organic carbon (SOC). This SOC is potentially vulnerable to remobilization following soil warming and permafrost thaw, but SOC stock estimates were poorly constrained and quantitative error estimates were lacking. This study presents revised estimates of permafrost SOC stocks, including quantitative uncertainty estimates, in the 0–3 m depth range in soils as well as for sediments deeper than 3 m in deltaic deposits of major rivers and in the Yedoma region of Siberia and Alaska. Revised estimates are based on significantly larger databases compared to previous studies. Despite this there is evidence of significant remaining regional data gaps. Estimates remain particularly poorly constrained for soils in the High Arctic region and physiographic regions with thin sedimentary overburden (mountains, highlands and plateaus) as well as for deposits below 3 m depth in deltas and the Yedoma region. While some components of the revised SOC stocks are similar in magnitude to those previously reported for this region, there are substantial differences in other components, including the fraction of perennially frozen SOC. Upscaled based on regional soil maps, estimated permafrost region SOC stocks are 217 ± 12 and 472 ± 27 Pg for the 0–0.3 and 0–1 m soil depths, respectively (±95% confidence intervals). Storage of SOC in 0–3 m of soils is estimated to 1035 ± 150 Pg....