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TRUNC ORCHIDEE-V1.9.6

TRUNC ORCHIDEE-V1.9.6. MICT branch. DOFOCO branch. 1) GPP-analytical f ew calibrations L inked to TRENDY. 01/02/14 - 28/02/14. (JG, FM, NV). 2) Soil freezing + New snow scheme. 01/03/14 - 31/04/14. (JG, Isabelle G, Tao W, CO). 01/05/14 - 31/05/14. (JG, MM, Tao W, SL).

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TRUNC ORCHIDEE-V1.9.6

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  1. TRUNC ORCHIDEE-V1.9.6 MICT branch DOFOCO branch 1) GPP-analytical few calibrations Linked to TRENDY 01/02/14 - 28/02/14 (JG, FM, NV) 2) Soil freezing + New snow scheme 01/03/14 - 31/04/14 (JG, Isabelle G, Tao W, CO) 01/05/14 - 31/05/14 (JG, MM,Tao W, SL) CMIP6-v0 New branchto test snowin coupledmode

  2. TRUNC DOFOCO branch 3) Grassland Management & Crop improvement 01/06/14 - 31/06/14 01/06/14 - 01/06/14 (JG, Pat C, NV, NV) (JG, Pat C, NV, SL) Bug corrections 4) SPITFIRE 01/07/14 - 01/09/14 01/07/14 - 01/09/14 5) Nitrogen Decide in June? CMIP6-v1 6) « left-over features » (& possible DOFOCO revision) Sept 2014 Code cleaning ORCHIDEE-V2 (new TRUNC) CMIP6-v2

  3. 1 Analytical Photosynthesis + Revision from TRENDY • Content: • Analytical resolution of the Farquhard model • Revision of some Photosynthetic parameters • Addition of a CO2 downregulation effect of Vcmax/Vjmax (optional) • Revision for the Tropical PFTs : • Fraction of C allocated to Above Ground Biomass decreased • Fraction of C allocated in the wood product pools changed • Impact: • Reduce the net global Carbon uptake over 20th Century in closer agreement to GCP estimates. • Change the futur predictions of C: lower sensitivity to increase CO2

  4. 2) Soil Freezing and new snow Albedo • Content: • Soil freezing scheme of Isabelle Goutevin: change thermal soil properties and water properties • New multi-layer snow scheme (from Meteo-France)with new snow albedo • Impact: • Strong impact of the energy balance and surface Temp.for high latitudes regions • …

  5. 3) Grassland management + Crop improvement • Content: • Add the module of Grass Management (grazing or cutting scenario) ; optional module • Change the Crop phenology with adding PFTs for Winter vs Summer crops, and change few parameters • Impact: • Changes in LAI : more realistic seasonal cycle • Impact the net carbon fluxes to the atmosphere • Impact the overall surface albedo and thus the energy balance

  6. 4) SPITFIRE • Content: • New module to compute the surface burned area depending on soil moisture condition, litter content, population,…. • Compute also the fraction of burned above ground C pools • Impact: • Mainly impact the net carbon fluxes to the atmosphere • Impact also the soil/vegetation carbon pools

  7. 5) NITROGEN Cycle • Content: • Nitrogen cycle in the soil (nitrification, denitrification,…) • Impact of N content on Photosynthesis • Impact: • Strong impact on the net carbon fluxes (through GPP) • Small impact on LE  Implementation in the TRUNC and/or in DOFOCO to be decided in June 2014.

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