Minutes of the meeting of May 31, 2018

• Presents: Fabienne, Vladislav, Philippe P, Nicolas Viovy, Nicolas Vuichard
• Problem in the phenology:
  • Here an illustration of the problem:
  • Problem in the way to compute the mean LAI per PFT in the mapper: The new diagnostic developed by Vlad shows the contribution of each PFT to the total LAI for specific regions (latitudinal bands, continents, ...). This is sensitive to the land use map used and is not the diagnostic expected (ie mean LAI for each PFT for a specific region).
    Action => Vlad will correct this in order to clearly identify which PFT(s) have a very bad phenology
  • Fabienne agrees on working on this issue. Nicolas Vui will give her the information needed for running this version of ORCHIDEE (next Thursday morning)
  • Several actions related to this problem of phenology
    • To modify specific parameters related to the allocation and/or the senescence. Based on the diagnostic, the problem might be only related to the leaf onset, which seems to slow in the temperate areas. Because the leaf onset is not enough abrupt, due to the residence time of the biomass, the problem at the leaf onset may impact as well the senescence phase.
    • To ensure that there is no change in the allocation module of the CN-CAN version compared to the CN version
    • And/or : To switch on the allocation module of CN and to switch on the one from CN-CAN

• Set-up of the coupled simulations LMDzOR:
  • For the moment, only one LMDzOR simulation has been done, in which the leaf C/N ratio was precribed with default values.
  • Simulations with dynamical C/N ratio have to be launched: Vlad will do one soon, starting from scratch. One may also envisage to launch one but starting from a restart file for orchidee component.
  • A simulation with C/N fix could also be done but with more realistic C/N ratio (spatialized) than those used in the first simulation.
• Problem in the autotrophic respiration
  • The share between maintenance and growth respiration is almost the opposite than the one expected.
  • There is an additional source of respiration related to the excess of labile Carbon when this pool reaches too high values. The respiration term is included into the growth respiration. This does not help to tune the maintenance and growth respiration terms.
  • Action: to remove the addition respiration related to the labile C and to diagnose the contribution of growth and maintenance respiration to the autotrophic respiration