Changes between Version 16 and Version 17 of Documentation/EvolutionOfFunctionality


Ignore:
Timestamp:
2020-05-06T23:15:59+02:00 (4 years ago)
Author:
luyssaert
Comment:

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  • Documentation/EvolutionOfFunctionality

    v16 v17  
    88|| Yes || Albedo (vegetation)  || For each PFT the total albedo for the grid square is computed as a weighted average of the vegetation albedo and the background albedo. The background albedo is composed by a snow and soil albedo. The soil albedo depends on the soil properties. || Rather than using soil properties, ORCHIDEE v2.1 uses spatially explicit observation-derived estimates for its background albedo in the absence of snow. || No changes from the previous version. || ORCHIDEE trunk 4 makes use of a two stream radiative transfer scheme through the canopy, extended to multiple canopy levels ([https://doi.org/10.5194/gmd-2016-280 More]). The scheme is based on Pinty et al 2006. This approach accounts not only for the leaf mass but also for the vertical and horizontal distribution of the leaf mass (= canopy structure), calculating an effective LAI based on the solar angle. Light from collimated (black sky) and diffuse (white sky) sources are used, and both are weighted equally as information about this partitioning is not yet available in forcing data ([https://forge.ipsl.jussieu.fr/orchidee/wiki/Documentation/TrunkFunctionality4#Albedor6614 More]). || 
    99|| No || Allocation || Carbon is allocated to the plant following resource limitations (Friedlingstein et al 1999). Plants allocate carbon to their different tissues in response to external limitations of water, light and nitrogen availability. When the ratios of these limitations are out of bounds, prescribed allocation factors are used. || No changes || || No changes || 
    10 || No || Anthropogenic species change || Not applicable || Not applicable || Describe || 
    11 || No || Bare soil || || || || 
    12 || No || Bark beetles || Not applicable || Not applicable || Describe ||  
     10|| No || Anthropogenic species change || Not applicable || Not applicable || Not applicable || Describe || 
     11|| No || Bare soil || || || || ||  
     12|| No || Bark beetles || Not applicable || Not applicable || Not applicable || Describe ||  
    1313|| No || Biogeography ||  Describe what was done in Krinner et al 2005 || Zhu et al 2.1or MICT? || No changes || Not yet available in this version || 
    1414|| No || Biological volatile emissions || Not applicable || Why was it added? What is added? || No changes || No changes || 
    … …  
    2727|| No || Snow temperature and dynamics || Describe snow energy budget in Krinner et al 2005 || How is it calculated now? See Tao || No changes || No changes || 
    2828|| No || Soil hydrology || Describe bucket model. Calculated for X soil columns. || Vertical water flow in the soil is based on the Fokker-Planck equation that resolves water diffusion in non-saturated conditions from the Richards equation (Richards, 1931). The 4 m soil column consists of eleven moisture layers with an exponentially increasing depth (D'Orgeval et al., 2008). Bare soil, short vegetation, and tall vegetation each have their own water column. || No changes || No changes || 
    29 || No || Soil and litter carbon and heterotrophic respiration || Following Parton et al. (1988), prescribed fractions of the different plant components go to the metabolic and structural litter pools following senescence, turnover or mortality. The decay of metabolic and structural litter is controlled by temperature and soil or litter humidity. For structural litter, its lignin content also influences the decay rate. || If there is insufficient N available to support the decomposition of the litter and soil carbon, heterotrophic respiration will be limited by the Nitrogen availability  || No changes || 
     29|| No || Soil and litter carbon and heterotrophic respiration || Following Parton et al. (1988), prescribed fractions of the different plant components go to the metabolic and structural litter pools following senescence, turnover or mortality. The decay of metabolic and structural litter is controlled by temperature and soil or litter humidity. For structural litter, its lignin content also influences the decay rate. || If there is insufficient N available to support the decomposition of the litter and soil carbon, heterotrophic respiration will be limited by the Nitrogen availability  || No changes || No Changes || 
    3030|| No || Soil temperature || The soil temperature is computed according to the Fourier equation using a finite difference implicit scheme with seven numerical nodes unevenly distributed between 0 and 5.5 m (Hourdin, 1992). ? How many soil temperature columns did we have ? || The differences in the vertical discretisation between the soil hydrology and soil temperature resulted in difficulties to conserve energy. The soil hydrology and temperature are calculated on a single vertical discretisation. A separate soil temperature is calculated for the bare soil, short vegetation, and tall vegetation. || No changes || No changes || 
    3131|| No || Vegetation distribution || Krinner et al 2005 describes global vegetation by 13 meta-classes (MTCs) with a specific parameter set (one for bare soil, eight for forests, two for grasslands and two for crop-lands) || The implementation of the MTC was generalized such that more than one PFT can be used to represent an MTC. ORCHIDEE 2.1 uses 13 MTCs to define 15 PFTs. || No changes || No changes ||