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Annual methane emission from Finnish mires estimated from eddy covariance campaign measurements

Hargreaves, K. J.; Fowler, D.; Pitcairn, C. E. R.; Aurela, M.. 2001 Annual methane emission from Finnish mires estimated from eddy covariance campaign measurements. Theoretical and Applied Climatology, 70 (1-2). 203-213. 10.1007/s007040170015

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Abstract/Summary

Measurements of landscape-scale methane emission were made over an aapa mire near Kaamanen in Finnish Lapland (69° 8′ N, 27° 16′ E, 155 m ASL). Emissions were measured during the spring thaw, in summer and in autumn. No effect of water table position on CH4 emission was found as the water table remained at or above the surface of the peat. Methane emission fluxes increased with surface temperature from which an activation energy of −99 kJ mol−1 was obtained. Annual emission from the site, modelled from temperature regression and short-term flux measurements made in three separate years, was calculated to be 5.5 ± 0.4 g CH4 m−2 y−1 of which 0.6 ± 0.1 g CH4 m−2 y−1 (11%) was released during the spring thaw which lasted 20 to 30 days. The effect of global warming on the CH4 budget of the site was estimated using the central scenario of the SILMU (Finnish Research Programme on Climate Change) model which predicts annual mean temperature increases of 1.2, 2.4 and 4.4 °C in 2020, 2050 and 2100, respectively. Maximum enhancements in CH4 emission due to warming were calculated to be 18, 40 and 84% for 2020, 2050 and 2100, respectively. Actual increases may be smaller because prediction of changes in water table are highly uncertain.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1007/s007040170015
Programmes: CEH Programmes pre-2009 publications > Biogeochemistry > CC01B Land-surface Feedbacks in the Climate System
CEH Sections: _ Pre-2000 sections
ISSN: 0177-798X
NORA Subject Terms: Meteorology and Climatology
Ecology and Environment
Atmospheric Sciences
Date made live: 27 Jul 2009 15:59
URI: http://nora.nerc.ac.uk/id/eprint/3656

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