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WP2 Progress Report

WP2 Progress Report. Paris, April 7, 2008 Modeled natural surface fluxes from LPJ University of Bristol Pru Foster Leilei Dong Colin Prentice Renato Spahni Rita Wania. And he said it was good, for there was HER model. LPJ-WHy-Me - Rita Wania LPJ-DyN -XuRi

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WP2 Progress Report

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  1. WP2 Progress Report Paris, April 7, 2008 Modeled natural surface fluxes from LPJ University of Bristol Pru Foster Leilei Dong Colin Prentice Renato Spahni Rita Wania

  2. And he said it was good, for there was HER model • LPJ-WHy-Me - Rita Wania • LPJ-DyN -XuRi • LPJ-SPITFIRE - Kirsten Thonicke • LPJ-GUESS - Almut Arneth First there was HYMN • Surface fluxes • CH4 from wetlands • N20 and NOx from soils • CO, NOx, CH4, H2 from fires • Isoprene from veg • H2 uptake from soils

  3. BENCHMARK Benchmark submodels prior to merging LPXLand Process eXchangeModel These components are being added directly to LPJ-WHy-Me where they are being benchmarked LPJ-WHy-Me LPX Renato’s tropical methane SPITFIRE LPJ-DyN Almut’s Isoprenes in LPJ-GUESS Hydrogen uptake

  4. Carbon Cycle CO2 Annual cycle x - observations - LPJ-WHyMe CO2 flux transported by TM2 plus: - ocean fluxes - fossil fuel

  5. Nevison Best guess WHOI ocean, GFED (NEP+best BB) + fossil fuels GLOBALVIEW Observations

  6. Carbon Flux Annual carbon flux from SPITFIRE in 2000 [gC / m2] Total = 2.9 E +16 [gC] Annual carbon flux from GFED in 2000 [gC/m2] Total = 2.03E+015 [gC]

  7. Burnt Area Annual burnt area in a 1o x 1o grid cell from SPITFIRE in 2000 [kha] Total =3.0 E+13 [m2] Annual burnt area in a 1o x 1o grid cell from GFED in 2000 [kha] Total = 3.56E+12 [m2]

  8. Almut Arneth’s isoprene model with LPJ-GUESS • I = e J a x I isoprene emission gC / g leaf / hr • fraction of electrons available for isoprene production, tuneable PFT dependent parameter. Note: PFTs further subdivided into 3 shade tolerance subcategories J = rate of electron transport a = [ci - G*] / [ 6 (4.67 ci + 9.33 G*) ] • = k t = ci(370ppm) / ci * exp [0.1 (Tleaf -30oC) ] ci internal CO2 concentration in the leaf

  9. Modifications to Almut’s Model • I = ex * (GPP / 84) * tune • e relative values from Guenther et al’s MEGAN model (2006, ACP) • = 12.6 - broad leaf trees 2.0 - needle evergreen trees • 0.7 - needle deciduous trees 0.5 - grass and other • tune - global tuning factor to get global emissions • GPP - gross primary productivity [gC/m2/s] • GPP / 84 = gC/m2/s * [1 mole C/12gC] * [4 moles e-/1moleC] / [28 moles e-/1 mole isoprene] • = moles isoprene / m2 / s • x = k t = ci(370ppm) / ci * exp [0.1 (Tleaf -30oC) ] • Tleaf = Tair + (Rn - l E) / (r cp ga)

  10. Almut’s annual isoprene emission 1980-2000

  11. Hauglustaine & Ehhalt 2002 JGR Scale H2 dry deposition velocity to NPP Mean global rate scaled LPJ WHy Me NPP Note this color scale is linear, H&P only linear above the blues Hydrogen uptake

  12. January Rhee et al ACP 2006

  13. NPP benchmarking LPJ

  14. Smith-Downey PhD Thesis F = Ds[H2] / z F flux Ds is diffusivity of hydrogen in soil at a given depth z Ds - Dgf2 (e/f)2.9Fcp (Moldrup et al 1999) Dg - diffusivity of hydrogen in air f - total porosity e - air filled porosity of soil Fcp - fraction of soil particles larger than 2 mm

  15. In Summary • LPJ-WHy-Me • interannual values of methane emission and uptake • stomatal conductance and LAI • isoprene emission and H2 uptake • LPJ DyN • benchmarking underway • working model needs globalization • LPJ SPITFIRE • producing too much fire globally • possibly can use older version

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