Is the northern high-latitude land-based CO 2 sink weakening?

D. J. Hayes, A. D. McGuire, D. W. Kicklighter, Kevin Gurney, T. J. Burnside, J. M. Melillo

Research output: Contribution to journalArticle

128 Citations (Scopus)

Abstract

Studies indicate that, historically, terrestrial ecosystems of the northern high-latitude region may have been responsible for up to 60% of the global net land-based sink for atmospheric CO 2. However, these regions have recently experienced remarkable modification of the major driving forces of the carbon cycle, including surface air temperature warming that is significantly greater than the global average and associated increases in the frequency and severity of disturbances. Whether Arctic tundra and boreal forest ecosystems will continue to sequester atmospheric CO 2 in the face of these dramatic changes is unknown. Here we show the results of model simulations that estimate a 41 Tg C yr -1 sink in the boreal land regions from 1997 to 2006, which represents a 73% reduction in the strength of the sink estimated for previous decades in the late 20th century. Our results suggest that CO 2 uptake by the region in previous decades may not be as strong as previously estimated. The recent decline in sink strength is the combined result of (1) weakening sinks due to warming-induced increases in soil organic matter decomposition and (2) strengthening sources from pyrogenic CO 2 emissions as a result of the substantial area of boreal forest burned in wildfires across the region in recent years. Such changes create positive feedbacks to the climate system that accelerate global warming, putting further pressure on emission reductions to achieve atmospheric stabilization targets.

Original languageEnglish (US)
Article numberGB3018
JournalGlobal Biogeochemical Cycles
Volume25
Issue number3
DOIs
StatePublished - 2011

Fingerprint

Carbon Monoxide
Ecosystems
boreal forest
warming
Global warming
Biological materials
tundra
Carbon
wildfire
terrestrial ecosystem
carbon cycle
Stabilization
forest ecosystem
soil organic matter
global warming
Decomposition
Feedback
Soils
stabilization
surface temperature

ASJC Scopus subject areas

  • Global and Planetary Change
  • Atmospheric Science
  • Environmental Science(all)
  • Environmental Chemistry

Cite this

Hayes, D. J., McGuire, A. D., Kicklighter, D. W., Gurney, K., Burnside, T. J., & Melillo, J. M. (2011). Is the northern high-latitude land-based CO 2 sink weakening? Global Biogeochemical Cycles, 25(3), [GB3018]. https://doi.org/10.1029/2010GB003813

Is the northern high-latitude land-based CO 2 sink weakening? / Hayes, D. J.; McGuire, A. D.; Kicklighter, D. W.; Gurney, Kevin; Burnside, T. J.; Melillo, J. M.

In: Global Biogeochemical Cycles, Vol. 25, No. 3, GB3018, 2011.

Research output: Contribution to journalArticle

Hayes, DJ, McGuire, AD, Kicklighter, DW, Gurney, K, Burnside, TJ & Melillo, JM 2011, 'Is the northern high-latitude land-based CO 2 sink weakening?', Global Biogeochemical Cycles, vol. 25, no. 3, GB3018. https://doi.org/10.1029/2010GB003813
Hayes DJ, McGuire AD, Kicklighter DW, Gurney K, Burnside TJ, Melillo JM. Is the northern high-latitude land-based CO 2 sink weakening? Global Biogeochemical Cycles. 2011;25(3). GB3018. https://doi.org/10.1029/2010GB003813
Hayes, D. J. ; McGuire, A. D. ; Kicklighter, D. W. ; Gurney, Kevin ; Burnside, T. J. ; Melillo, J. M. / Is the northern high-latitude land-based CO 2 sink weakening?. In: Global Biogeochemical Cycles. 2011 ; Vol. 25, No. 3.
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