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Titel |
Multisite comparison of drivers of methane emissions from wetlands in the European Arctic: influence of vegetation community and water table. |
VerfasserIn |
Kerry Dinsmore, Julia Drewer, Sarah Leeson, Ute Skiba, Pete Levy, Charles George |
Konferenz |
EGU General Assembly 2014
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Medientyp |
Artikel
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Sprache |
Englisch
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 16 (2014) |
Datensatznummer |
250098099
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Publikation (Nr.) |
EGU/EGU2014-13739.pdf |
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Zusammenfassung |
Arctic and sub arctic wetlands are a major source of atmospheric CH4 and therefore have the
potential to be important in controlling global radiative forcing. Furthermore, the strong links
between wetland CH4 emissions and vegetation community, hydrology and temperature
suggest potentially large feedbacks between climate change and future emissions.
Quantifying current emissions over large spatial scales and predicting future climatic
feedbacks requires a fundamental understanding of the ground based drivers of plot scale
emissions.
The MAMM project (Methane in the Arctic: Measurements and Modelling) aims to
understand and quantify current CH4 emissions and future climatic impacts by combining
both ground and aircraft measurements across the European Arctic with regional computer
modelling. Here we present results from the ground-based MAMM measurement
campaigns, analysing chamber-measured CH4 emissions from two sites in the European
Arctic/Sub-Arctic region (Sodankylä, Finland; Stordalen Mire, Sweden) from growing
seasons in 2012 and 2013.
A total of 85 wetland static chambers were deployed across the two field sites; 39 at
Sodankylä (67°22’01” N, 26°3’06” E) in 2012 and 46 at Stordalen Mire (68°21’20” N,
19°02’56” E) in 2013. Chamber design, protocol and deployment were the same across both
sites. Chambers were located at sites chosen strategically to cover the local range of water
table depths and vegetation communities. A total of 18 and 15 repeated measurements were
made at each chamber in Sodankylä and Stordalen Mire, respectively, over the
snow-free season. Preliminary results show a large range of CH4 fluxes across both
sites ranging from a CH4 uptake of up to 0.07 and 0.06 mg CH4-C m-2 hr-1 to
emissions of 17.3 and 44.2 mg CH4-C m-2 hr-1 in Sodankylä and Stordalen Mire,
respectively.
Empirical models based on vegetation community, water table depth, temperature and soil
nutrient availability (Plant Root Simulator Probes, PRSTM) have been constructed with the
aim of understanding the drivers of chamber scale fluxes. By combining measurements made
at two different sites, >300km apart, using the same experimental setup, we are
uniquely able to investigate whether CH4 emissions are driven by common parameters.
Furthermore we are able to determine if plot scale empirical models and parameterisations
can be used effectively to upscale emissions to landscape and whole Arctic scale. |
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