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

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 ofmore » 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.« less

Authors:
ORCiD logo [1]; ORCiD logo [1];  [2];  [3];  [1]
  1. Northern Arizona Univ., Flagstaff, AZ (United States)
  2. Northern Arizona Univ., Flagstaff, AZ (United States); Univ. of Alaska, Fairbanks, AK (United States)
  3. Univ. of Florida, Gainesville, FL (United States)
Publication Date:
Research Org.:
Univ. of Florida, Gainesville, FL (United States); Northern Arizona Univ., Flagstaff, AZ (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1539766
Alternate Identifier(s):
OSTI ID: 1469221
Grant/Contract Number:  
SC0006982; SC0014085; 1203777; 1026415; 0747195
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Biogeosciences
Additional Journal Information:
Journal Volume: 123; Journal Issue: 9; Journal ID: ISSN 2169-8953
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Environmental Sciences & Ecology; Geology

Citation Formats

Taylor, M. A., Celis, G., Ledman, J. D., Bracho, R., and Schuur, E. A. G. Methane Efflux Measured by Eddy Covariance in Alaskan Upland Tundra Undergoing Permafrost Degradation. United States: N. p., 2018. Web. doi:10.1029/2018jg004444.
Taylor, M. A., Celis, G., Ledman, J. D., Bracho, R., & Schuur, E. A. G. Methane Efflux Measured by Eddy Covariance in Alaskan Upland Tundra Undergoing Permafrost Degradation. United States. doi:10.1029/2018jg004444.
Taylor, M. A., Celis, G., Ledman, J. D., Bracho, R., and Schuur, E. A. G. Tue . "Methane Efflux Measured by Eddy Covariance in Alaskan Upland Tundra Undergoing Permafrost Degradation". United States. doi:10.1029/2018jg004444. https://www.osti.gov/servlets/purl/1539766.
@article{osti_1539766,
title = {Methane Efflux Measured by Eddy Covariance in Alaskan Upland Tundra Undergoing Permafrost Degradation},
author = {Taylor, M. A. and Celis, G. and Ledman, J. D. and Bracho, R. and Schuur, E. A. G.},
abstractNote = {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 (CH4) or carbon dioxide (CO2), 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 CH4 fluxes suggest that nongrowing season emissions make up a significant proportion of tundra systems emissions on an annual basis. Here we present continuous CH4 flux measurements made at Eight Mile Lake, an upland tundra ecosystem undergoing permafrost degradation in Interior Alaska. We found net CH4 emissions throughout the year (1.2 ∓ 0.011 g C-CH4 m2/yr) that made up 61% of total radiative forcing from annual C emissions (CO2 and CH4; 32.3 g C m2/yr) when taking into account the greenhouse warming potential of CH4 relative to CO2. Nongrowing season emissions accounted for 50% of the annual CH4 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 CH4 emissions in 2016 and 2017 were significantly related with thaw depth, and the magnitude of CH4 emissions between these seasons was proportional to the rate of active layer thaw throughout the season.},
doi = {10.1029/2018jg004444},
journal = {Journal of Geophysical Research. Biogeosciences},
issn = {2169-8953},
number = 9,
volume = 123,
place = {United States},
year = {2018},
month = {7}
}

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