Estimated stocks of circumpolar permafrost carbon with quantified uncertainty ranges and identified data gaps
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Open Access
- 1 December 2014
- journal article
- research article
- Published by Copernicus GmbH in Biogeosciences (online)
- Vol. 11 (23), 6573-6593
- https://doi.org/10.5194/bg-11-6573-2014
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. Of this, 34 ± 16 Pg C is stored in poorly developed soils of the High Arctic. Based on generalized calculations, storage of SOC below 3 m of surface soils in deltaic alluvium of major Arctic rivers is estimated as 91 ± 52 Pg. In the Yedoma region, estimated SOC stocks below 3 m depth are 181 ± 54 Pg, of which 74 ± 20 Pg is stored in intact Yedoma (late Pleistocene ice- and organic-rich silty sediments) with the remainder in refrozen thermokarst deposits. Total estimated SOC storage for the permafrost region is ∼1300 Pg with an uncertainty range of ∼1100 to 1500 Pg. Of this, ∼500 Pg is in non-permafrost soils, seasonally thawed in the active layer or in deeper taliks, while ∼800 Pg is perennially frozen. This represents a substantial ∼300 Pg lowering of the estimated perennially frozen SOC stock compared to previous estimates.Keywords
This publication has 60 references indexed in Scilit:
- Estimating the Permafrost-Carbon Climate Response in the CMIP5 Climate Models Using a Simplified ApproachJournal of Climate, 2013
- Uncertainties in the global temperature change caused by carbon release from permafrost thawingThe Cryosphere, 2012
- Field information links permafrost carbon to physical vulnerabilities of thawingGeophysical Research Letters, 2012
- Spatial upscaling using thematic maps: An analysis of uncertainties in permafrost soil carbon estimatesGlobal Biogeochemical Cycles, 2012
- Vulnerability of high-latitude soil organic carbon in North America to disturbanceJournal of Geophysical Research: Biogeosciences, 2011
- Spatial distribution of soil organic carbon in northwest Greenland and underestimates of high Arctic carbon storesGlobal Biogeochemical Cycles, 2010
- Magnitude and sources of uncertainties in soil organic carbon (SOC) stock assessments at various scalesEuropean Journal of Soil Science, 2009
- Balancing the Global Carbon BudgetAnnual Review of Earth and Planetary Sciences, 2007
- Effects of wildfire and permafrost on soil organic matter and soil climate in interior AlaskaGlobal Change Biology, 2006
- Surficial geology, subsurface materials, and thaw sensitivity of sedimentsPublished by Natural Resources Canada/CMSS/Information Management ,2000