Net emissions of CH4 and CO2 in Alaska : implications for the region's greenhouse gas budget
Melillo, Jerry M.
McGuire, A. David
Kicklighter, David W.
Prinn, Ronald G.
Steudler, Paul A.
Felzer, Benjamin S.
MetadataShow full item record
KeywordAlaska (USA); Global warming potential; Greenhouse gas budget; Methane consumption and emissions; Methanogenesis; Methanotrophy
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).
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.
Showing items related by title, author, creator and subject.
Galford, Gillian L.; Melillo, Jerry M.; Mustard, John F.; Cerri, Carlos E. P.; Cerri, Carlos C. (American Meteorological Society, 2010-10-28)The Brazilian Amazon is one of the most rapidly developing agricultural frontiers in the world. The authors assess changes in cropland area and the intensification of cropping in the Brazilian agricultural frontier state ...
Impacts of rice varieties and management on yield-scaled greenhouse gas emissions from rice fields in China : a meta-analysis Zheng, H.; Huang, H.; Yao, L.; Liu, J.; He, H.; Tang, Jianwu (Copernicus Publications on behalf of the European Geosciences Union, 2014-07-10)Increasing numbers of studies have suggested that a comprehensive assessment of the impacts of cropping practices on greenhouse gas (GHG) emissions per unit yield (yield-scaled), rather than by land area (area-scaled), is ...
Hayes, Daniel J.; Kicklighter, David W.; McGuire, A. David; Chen, Min; Zhuang, Qianlai; Yuan, Fengming; Melillo, Jerry M.; Wullschleger, Stan D. (IOP Publishing, 2014-04-06)Permafrost thaw and the subsequent mobilization of carbon (C) stored in previously frozen soil organic matter (SOM) have the potential to be a strong positive feedback to climate. As the northern permafrost region experiences ...