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HYMN Meeting Garmisch, 13./15. October 2008

HYMN Meeting Garmisch, 13./15. October 2008. Global net soil CH 4 emission estimates using LPJ-WHyMe. R. Spahni, R. Wania, P. Foster, L. Dong, C. Prentice University of Bristol. CH 4 net emissions. NH PEATLAND FLUX per grid cell. Corrections: Micro topography of peatlands: 0.7

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HYMN Meeting Garmisch, 13./15. October 2008

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  1. HYMN MeetingGarmisch, 13./15. October 2008 Global net soil CH4 emission estimates using LPJ-WHyMe R. Spahni, R. Wania, P. Foster, L. Dong, C. PrenticeUniversity of Bristol

  2. CH4 net emissions

  3. NH PEATLAND FLUX per grid cell • Corrections: • Micro topography of peatlands: 0.7 • Peatland area: 2.61(compared to Prigent et al., 2007)

  4. WET SOIL FLUX per grid cell • Scaling: • soil heterotrophic respiration • soil moisture (85%-100% of field capacity, 35%-57% WFPS) • conversion factor to CH4 of r(CH4-C/CO2-C) = 0.007374

  5. WETLAND FLUX per grid cell • Scaling: • Satellite derived inundation map (Prigent et al. 2007) • soil heterotrophic respiration • conversion factor to CH4 of r(CH4-C/CO2-C) = 0.007374 * 5

  6. SOIL CONSUMPTION FLUX per grid cell • Using: • NOAA ESRL Globalview CH4 data set • Zero uptake for organic soils and inundated areas

  7. NET FLUX per grid cell • Additive flux for 2006: • NetFlux = PLF + WSF + WLF - SCF • NetFlux = 42.1 + 104.1 + 90.1 - 36.0 = 200.3 Tg CH4/year

  8. CH4 flux variation over time

  9. CH4 flux variation over time

  10. IGBP-DIS Organic soils Northern wetlands modelled by LPJ-WHyMe (Rita) Emissions are calcualted for peatlands scaled with the fractional coverage of organic soils to 1° x 1° grid cells. Global wetlands parameterised using LPJ output Emissions for non-peatland gridcell fraction is calculated by e(CH4) = a. rheterotrophic. fwhc

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