Title The consumption of atmospheric methane by soil in a simulated future climate
Author Curry, C.L.
Author Affil Curry, C.L., Environment Canada, Canadian Centre for Climate Modelling and Analysis, Victoria, BC, Canada
Source Biogeosciences, 6(11), p.2355-2367, . Publisher: Copernicus GmbH on behalf of the European Union, Katlenburg-Lindau, International. ISSN: 1726- 4170
Publication Date 2009
Notes In English. Published in Biogeosciences Discussions: 23 June 2009, http://www.biogeosciences- discuss.net/6/6077/2009/bgd-6-6077-2009.html; accessed in Feb., 2011; abstract: doi:10.5194/bg-6-2355-2009. 26 refs. GeoRef Acc. No: 308341
Index Terms Alpine landscapes; alpine tundra; precipitation (meteorology); climatic change; diffusion; ecosystems; evaporation; forest tundra; global change; global warming; hydrocarbons; moisture; snow; soils; soil temperature; temperature; tundra; aliphatic hydrocarbons; alkanes; alpine environment; arid environment; atmospheric precipitation; atmospheric transport; boreal environment; chemical reactions; climate change; climate effects; diffusivity; forests; global; greenhouse gases; methane; one-dimensional models; organic compounds; sinks; temperate environment; terrestrial environment; transport; tropical environment
Abstract A recently developed model for the consumption of atmospheric methane by soil (Curry, 2007) is used to investigate the global magnitude and distribution of methane uptake in a simulated future climate. In addition to solving the one-dimensional diffusion- reaction equation, the model includes a parameterization of biological CH4 oxidation that is sensitive to soil temperature and moisture content, along with specified reduction factors for land cultivation and wetland fractional coverage. Under the SRES emission scenario A1B, the model projects an 8% increase in the global annual mean CH4 soil sink by 2100, over and above the 15% increase expected from increased CH4 concentration alone. While the largest absolute increases occur in cool temperate and subtropical forest ecosystems, the largest relative increases in consumption (40%) are seen in the boreal forest, tundra and polar desert environments of the high northern latitudes. Methane uptake at mid- to high northern latitudes increases year-round in 2100, with a 68% increase over present-day values in June. This increase is primarily due to enhanced soil diffusivity resulting from lower soil moisture produced by increased evaporation and reduced snow cover. At lower latitudes, uptake is enhanced mainly by elevated soil temperatures and/or reduced soil moisture stress, with the dominant influence determined by the local climate.
URL http://www.biogeosciences.net/6/2355/2009/bg-6-2355-2009.pdf
Publication Type journal article
Record ID 65004961