Methane Efflux Measured by Eddy Covariance in Alaskan Upland Tundra Undergoing Permafrost Degradation

Taylor, M. A.; Celis, G.; Ledman, J. D.; Bracho, R.; Schuur, E. A.  G.

doi:10.1029/2018jg004444

Title: Methane Efflux Measured by Eddy Covariance in Alaskan Upland Tundra Undergoing Permafrost Degradation

Journal Article · Tue Jul 17 00:00:00 EDT 2018 · Journal of Geophysical Research. Biogeosciences

DOI:https://doi.org/10.1029/2018jg004444· OSTI ID:1539766

^[1];

^[1]; Ledman, J. D. ^[2]; Bracho, R. ^[3]; Schuur, E. A. G. ^[1]

Northern Arizona Univ., Flagstaff, AZ (United States)
Northern Arizona Univ., Flagstaff, AZ (United States); Univ. of Alaska, Fairbanks, AK (United States)
Univ. of Florida, Gainesville, FL (United States)

Abstract Greenhouse gas emissions from thawing permafrost in arctic ecosystems may amplify global warming, yet estimates of the rate of carbon release, and the proportion of carbon released as methane (CH ₄ ) or carbon dioxide (CO ₂ ), have a high degree of uncertainty. There are many areas where no measurements exist, and few year‐round or long‐term records. Existing year‐round eddy covariance measurements of arctic CH ₄ fluxes suggest that nongrowing season emissions make up a significant proportion of tundra systems emissions on an annual basis. Here we present continuous CH ₄ flux measurements made at Eight Mile Lake, an upland tundra ecosystem undergoing permafrost degradation in Interior Alaska. We found net CH ₄ emissions throughout the year (1.2 ∓ 0.011 g C‐CH ₄ m ² /yr) that made up 61% of total radiative forcing from annual C emissions (CO ₂ and CH ₄ ; 32.3 g C m ² /yr) when taking into account the greenhouse warming potential of CH ₄ relative to CO ₂ . Nongrowing season emissions accounted for 50% of the annual CH ₄ budget, characterized by large pulse emissions. These were related to abrupt increases in air and shallow soil temperatures rather than consistent emissions during the zero curtain—a period of the fall/early winter season when subsurface soil temperatures remain near the 0 °C freezing point. Weekly growing season CH ₄ emissions in 2016 and 2017 were significantly related with thaw depth, and the magnitude of CH ₄ emissions between these seasons was proportional to the rate of active layer thaw throughout the season.

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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:: 1539766

Alternate ID(s):: OSTI ID: 1469221

Journal Information:: Journal of Geophysical Research. Biogeosciences, Vol. 123, Issue 9; ISSN 2169-8953

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 25 works

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