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    Is the northern high-latitude land-based CO2 sink weakening?

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    Text S1: Details on the updates to model components and process representations related to the simulated fluxes analyzed in this study. (341Kb)
    Text S1: Details on the updates to model components and process representations related to the simulated fluxes analyzed in this study. (207.9Kb)
    Date
    2011-08-30
    Author
    Hayes, Daniel J.  Concept link
    McGuire, A. David  Concept link
    Kicklighter, David W.  Concept link
    Gurney, Kevin R.  Concept link
    Burnside, T. J.  Concept link
    Melillo, Jerry M.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4831
    As published
    https://doi.org/10.1029/2010GB003813
    DOI
    10.1029/2010GB003813
    Keyword
     Carbon cycle; High-latitude ecosystems; Modeling 
    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 CO2. 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 CO2 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 CO2 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 CO2 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.
    Description
    Author Posting. © American Geophysical Union, 2011. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 25 (2011): GB3018, doi:10.1029/2010GB003813.
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    • Ecosystems Center
    Suggested Citation
    Global Biogeochemical Cycles 25 (2011): GB3018
     

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