Changes between Version 14 and Version 15 of Branches/ORCHIDEE_3
- Timestamp:
- 2020-12-10T17:46:23+01:00 (4 years ago)
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Branches/ORCHIDEE_3
v14 v15 12 12 13 13 == Model configurations and associated forcings == 14 === Standard configuration === 14 15 The 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 the different nitrogen inputs: 15 16 * '''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 17 * ${R_IN}/SRF/NITROGEN/N_DEPOSITION/CCMI_ndep/historical/CCMI_ndep_nhx_${year}.nc 17 18 * ${R_IN}/SRF/NITROGEN/N_DEPOSITION/CCMI_ndep/historical/CCMI_ndep_noy_${year}.nc 18 * '' Synthetic fertilizer use''': By default, one uses annual data from Lu and Tian, 2017 (https://doi.pangaea.de/10.1594/PANGAEA.863323) 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 * '''Synthetic fertilizer use''': By default, one uses annual data from Lu and Tian, 2017 (https://doi.pangaea.de/10.1594/PANGAEA.863323) 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 20 * ${R_IN}/SRF/NITROGEN/N_FERTILISATION/NMIP/synthetic/historical/Nfer_pasture_${year}.nc 20 21 * ${R_IN}/SRF/NITROGEN/N_FERTILISATION/NMIP/synthetic/historical/Nfer_cropland_${year}.nc … … 25 26 * '''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/bnf_1850.nc 26 27 In addition to the Nitrogen-related forcings, the mineral nitrogen dynamic model needs soil pH and soil bulk density which are provided as model inputs. Default bulk density at 0.5×0.5 degree resolution is from the Harmonized World Soil Database (HWSD; FAO/IIASA/ISRIC/ISSCAS/JRC, 2012) and default soil pH from the International Geosphere–Biosphere Programme Data Information System (Global Soil Data Task Group, 2000). Datasets are stored on the shared repositories here: ${R_IN}/SRF/SOIL/soil_bulk_and_ph.nc 28 29 === Non interactive nitrogen configuration ===