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Title: Carbon Thaw Rate Doubles When Accounting for Subsidence in a Permafrost Warming Experiment

Journal Article · · Journal of Geophysical Research. Biogeosciences
DOI:https://doi.org/10.1029/2019jg005528· OSTI ID:1801748
ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [4];  [1]; ORCiD logo [5];  [1]; ORCiD logo [6]; ORCiD logo [1];  [1]
  1. Northern Arizona Univ., Flagstaff, AZ (United States). Center for Ecosystem Science and Society
  2. Northern Arizona Univ., Flagstaff, AZ (United States). Center for Ecosystem Science and Society; Univ. of Alaska, Fairbanks, AK (United States). Bonanza Creek Long Term Ecological Research Site
  3. Northern Arizona Univ., Flagstaff, AZ (United States). Center for Ecosystem Science and Society; Univ. of Texas at El Paso, TX (United States)
  4. Woods Hole Research Center, Falmouth, MA (United States)
  5. Institute of Agricultural Sciences, Madrid (Spain)
  6. Northern Arizona Univ., Flagstaff, AZ (United States). Center for Ecosystem Science and Society and School of Informatics, Computing, and Cyber Systems

Abstract Permafrost thaw is typically measured with active layer thickness, or the maximum seasonal thaw measured from the ground surface. However, previous work has shown that this measurement alone fails to account for ground subsidence and therefore underestimates permafrost thaw. To determine the impact of subsidence on observed permafrost thaw and thawed soil carbon stocks, we quantified subsidence using high‐accuracy GPS and identified its environmental drivers in a permafrost warming experiment near the southern limit of permafrost in Alaska. With permafrost temperatures near 0°C, 10.8 cm of subsidence was observed in control plots over 9 years. Experimental air and soil warming increased subsidence by five times and created inundated microsites. Across treatments, ice and soil loss drove 85–91% and 9–15% of subsidence, respectively. Accounting for subsidence, permafrost thawed between 19% (control) and 49% (warming) deeper than active layer thickness indicated, and the amount of newly thawed carbon within the active layer was between 37% (control) and 113% (warming) greater. As additional carbon thaws as the active layer deepens, carbon fluxes to the atmosphere and lateral transport of carbon in groundwater could increase. The magnitude of this impact is uncertain at the landscape scale, though, due to limited subsidence measurements. Therefore, to determine the full extent of permafrost thaw across the circumpolar region and its feedback on the carbon cycle, it is necessary to quantify subsidence more broadly across the circumpolar region.

Research Organization:
Univ. of Florida, Gainesville, FL (United States); Northern Arizona Univ., Flagstaff, AZ (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0006982; SC0014085; DE‐SC0014085; DE‐SC0006982
OSTI ID:
1801748
Alternate ID(s):
OSTI ID: 1633843
Journal Information:
Journal of Geophysical Research. Biogeosciences, Vol. 125, Issue 6; ISSN 2169-8953
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 19 works
Citation information provided by
Web of Science

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