Changes between Version 11 and Version 12 of Branches/ORCHIDEE_3

12/10/20 17:34:27 (12 months ago)



  • Branches/ORCHIDEE_3

    v11 v12  
    1010== Publications and associated model revisions == 
    1111Currently, two key model revisions of the "ORCHIDEE model with nitrogen" have been used in published studies. One is revision 4999 of branch ORCHIDEE (source:branches/ORCHIDEE-CN@4999) with which model evaluation in terms of GPP at local and global scale has been pusblished (see [ Vuichard et al., 2019] and This version [source:branches/ORCHIDEE-CN@4999 4999] parcipated also to a model intercomparison study (NMIP) aiming at quantifying N2O emissions by land at global scale (see [ Tian et al., 2018]; [ Tian et al., 2019] and [ Tian et al., 2020]). The second major version is revision 6863 of the branch ORCHIDEE_3 ([source:/branches/ORCHIDEE_3@6863]). This version participated to the GCB 2020 study published by [ Frielingstein et al., 2020] as the official ORCHIDEE model.   
     13== Model configurations and associated forcings == 
     14The standard configuration of ORCHIDEE_3 accounts for a dynamic nitrogen cycle in which Nitrogen content in soil and plant reservoirs varies accordingly to environmental conditions. In this configuration, compared to Carbon-only model versions like ORCHIDEE_2, additional forcings are needed related to different nitrogen inputs: 
     15 * Nitrogen atmospheric deposition: ORCHIDEE_3 considers seperately reduced (NHx) and oxydised (NOy) forms of nitrogen. By default, one uses the monthly atmospheric N deposition during 1860 - 2014 from the IGAC/SPARC Chemistry-Climate Model Initiative (CCMI) as in the Tian et al. (2019) and the current GCB papers. They are stored on the shared repositories here:  
     16  * ${R_IN}/SRF/NITROGEN/N_DEPOSITION/CCMI_ndep/historical/CCMI_ndep_nhx_${year}.nc  
     17  * ${R_IN}/SRF/NITROGEN/N_DEPOSITION/CCMI_ndep/historical/CCMI_ndep_noy_${year}.nc   
     18 * Synthetic fertilizer use: By default, one uses annual data from Lu and Tian, 2017 ( which provide the annual synthetic/mineral N fertilizer rate from 1960 to 2014 specifically for croplands and grasslands. They are stored on the shared repositories here:  
     19  * ${R_IN}/SRF/NITROGEN/N_FERTILISATION/NMIP/synthetic/historical/Nfer_pasture_${year}.nc 
     20  * ${R_IN}/SRF/NITROGEN/N_FERTILISATION/NMIP/synthetic/historical/Nfer_cropland_${year}.nc 
     21 * Organic fertilizer use: By default, one uses gridded annual manure N production in the  period of 1860-2014 developed by Zhang et al., 2017 ( and applied separately on grasslands and croplands. They are stored on the shared repositories here:  
     22  * ${R_IN}/SRF/NITROGEN/N_FERTILISATION/NMIP/manure/historical/Nmanure_pasture_${year}.nc       
     23  * ${R_IN}/SRF/NITROGEN/N_FERTILISATION/NMIP/manure/historical/Nmanure_cropland_${year}.nc  
     24 The use of manure in the model has to be done with caution as it added carbon in the ecosystem as well. This carbon is taken for the crop harvested biomass which is deduced from this term 
     25 * Biological nitrogen fixation: In ORCHIDEE-3, there is no computation of the BNF rate. One uses a single climatology for BNF as a function of present-day evapotranspiration following the approach of Cleveland et al. (1999). The forcing used by default is stored on the shared repositories here:  ${R_IN}/SRF/NITROGEN/BNF/