Soil organic carbon pools in the northern circumpolar permafrost region
Charles Tarnocai,Josep G. Canadell,Edward A. G. Schuur,Peter Kuhry,Galina Mazhitova,Sergei Zimov +5 more
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In this article, the authors reported a new estimate of the carbon pools in soils of the northern permafrost region, including deeper layers and pools not accounted for in previous analyses.Abstract:
of all soils in the northern permafrost region is approximately 18,782 � 10 3 km 2 ,o r approximately 16% of the global soil area. In the northern permafrost region, organic soils (peatlands) and cryoturbated permafrost-affected mineral soils have the highest mean soil organic carbon contents (32.2–69.6 kg m �2 ). Here we report a new estimate of the carbon pools in soils of the northern permafrost region, including deeper layers and pools not accounted for in previous analyses. Carbon pools were estimated to be 191.29 Pg for the 0–30 cm depth, 495.80 Pg for the 0–100 cm depth, and 1024.00 Pg for the 0–300 cm depth. Our estimate for the first meter of soil alone is about double that reported for this region in previous analyses. Carbon pools in layers deeper than 300 cm were estimated to be 407 Pg in yedoma deposits and 241 Pg in deltaic deposits. In total, the northern permafrost region contains approximately 1672 Pg of organic carbon, of which approximately 1466 Pg, or 88%, occurs in perennially frozen soils and deposits. This 1672 Pg of organic carbon would account for approximately 50% of the estimated global belowground organic carbon pool.read more
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Overwintering fires in boreal forests.
TL;DR: In this paper, the authors show that overwintering fires in boreal forests are associated with hot summers generating large fire years and deep burning into organic soils, conditions that have become more frequent in the study areas in recent decades.
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Dispersal limitation and thermodynamic constraints govern spatial structure of permafrost microbial communities.
Eric M. Bottos,Eric M. Bottos,David W. Kennedy,Elvira B. Romero,Sarah J. Fansler,Joseph Brown,Lisa M. Bramer,Rosalie K. Chu,Malak M. Tfaily,Janet K. Jansson,James C. Stegen +10 more
TL;DR: It is hypothesized that permafrost communities are shaped by physical constraints imposed by prolonged freezing, and exhibit spatial distributions that reflect dispersal limitation and selective pressures associated with these physical constraints.
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Hydrogeochemistry of seasonal flow regimes in the Chena River, a subarctic watershed draining discontinuous permafrost in interior Alaska (USA)
TL;DR: In this paper, the Chena River in Interior Alaska was studied to quantify dissolved organic carbon (DOC), total dissolved nitrogen (TDN), major ion, strontium isotope, and stable oxygen and hydrogen isotope values during two year-long time series sampling periods.
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Spatial distribution and changes of permafrost on the Qinghai-Tibet Plateau revealed by statistical models during the period of 1980 to 2010
TL;DR: The LRM and MCA modeling results revealed that permafrost area has significantly decreased at a rate of 0.066 × 106 km2 decade-1 over the past 30 years, and the decrease of permaf Frost area is accelerating.
Journal ArticleDOI
Seasonal ice and hydrologic controls on dissolved organic carbon and nitrogen concentrations in a boreal-rich fen
Evan S. Kane,Evan S. Kane,Merritt R. Turetsky,Jennifer W. Harden,A. David McGuire,James M. Waddington +5 more
TL;DR: In this article, the authors examined the response of dissolved organic carbon (DOC) and total dissolved nitrogen (TDN) across an experimental manipulation of water table position (both raised and lowered water table treatments) in a boreal-rich fen in interior Alaska.
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