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    Net emissions of CH4 and CO2 in Alaska : implications for the region's greenhouse gas budget

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    1051-0761(2007)017[0203_neocac]2.0.co;2.pdf (196.3Kb)
    Date
    2007-01
    Author
    Zhuang, Qianlai  Concept link
    Melillo, Jerry M.  Concept link
    McGuire, A. David  Concept link
    Kicklighter, David W.  Concept link
    Prinn, Ronald G.  Concept link
    Steudler, Paul A.  Concept link
    Felzer, Benjamin S.  Concept link
    Hu, Shaomin  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4714
    As published
    https://doi.org/10.1890/1051-0761(2007)017[0203:NEOCAC]2.0.CO;2
    DOI
    10.1890/1051-0761(2007)017[0203:NEOCAC]2.0.CO;2
    Keyword
     Alaska (USA); Global warming potential; Greenhouse gas budget; Methane consumption and emissions; Methanogenesis; Methanotrophy 
    Abstract
    We used a biogeochemistry model, the Terrestrial Ecosystem Model (TEM), to study the net methane (CH4) fluxes between Alaskan ecosystems and the atmosphere. We estimated that the current net emissions of CH4 (emissions minus consumption) from Alaskan soils are 3 Tg CH4/yr. Wet tundra ecosystems are responsible for 75% of the region's net emissions, while dry tundra and upland boreal forests are responsible for 50% and 45% of total consumption over the region, respectively. In response to climate change over the 21st century, our simulations indicated that CH4 emissions from wet soils would be enhanced more than consumption by dry soils of tundra and boreal forests. As a consequence, we projected that net CH4 emissions will almost double by the end of the century in response to high-latitude warming and associated climate changes. When we placed these CH4 emissions in the context of the projected carbon budget (carbon dioxide [CO2] and CH4) for Alaska at the end of the 21st century, we estimated that Alaska will be a net source of greenhouse gases to the atmosphere of 69 Tg CO2 equivalents/yr, that is, a balance between net methane emissions of 131 Tg CO2 equivalents/yr and carbon sequestration of 17 Tg C/yr (62 Tg CO2 equivalents/yr).
    Description
    Author Posting. © Ecological Society of America, 2007. This article is posted here by permission of Ecological Society of America for personal use, not for redistribution. The definitive version was published in Ecological Applications 17 (2007): 203–212, doi:10.1890/1051-0761(2007)017[0203:NEOCAC]2.0.CO;2.
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    • Ecosystems Center
    Suggested Citation
    Ecological Applications 17 (2007): 203–212
     

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