Changes between Version 131 and Version 132 of DevelopmentActivities/ORCHIDEE-CNP


Ignore:
Timestamp:
2017-11-06T09:53:55+01:00 (6 years ago)
Author:
dgoll
Comment:

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  • DevelopmentActivities/ORCHIDEE-CNP

    v131 v132  
    44It is based on ORCHIDEE-CN, which was extended and corrected as described here: https://forge.ipsl.jussieu.fr/orchidee/wiki/Branches/MergeOCN/Goll as well as additional non-documented bugfixes to avoid negative pools due to machine precisions as well as bugs. 
    55 
    6 The phosphorus cycle and the model evaluation at two sites along a soil formation chronosequence is published at GMD [https://www.geosci-model-dev-discuss.net/gmd-2017-62/].  
     6The phosphorus cycle and the model evaluation at two sites along a soil formation chronosequence is published at GMD [https://www.geosci-model-dev-discuss.net/gmd-2017-62/]. Some information regarding the model here is outdated; please see publication for most recent model description.  
    77 
    88== 1. Conceptual modifications to the nitrogen cycle == 
    … …  
    4747You can find information on how to setup the simulations here: [https://forge.ipsl.jussieu.fr/orchidee/wiki/DevelopmentActivities/ORCHIDEE-CNP/howtoUse] 
    4848 
    49 == 6. Prescribing tissue stoichiometry: WARNING == 
    50 At the moment prescribing tissue CN and NP ratio have only a purpose when spinning up the model, but cannot be used for the analysis of nutrient limitation. 
    51 The effect of nutrient limitation on growth is not handled consistently when prescribing leaf CN ratios which are not optimal ratios  (CNmin and NPmin). 
    52 However, the effect of nutrient limitation on growth is substantial when CN and/or NP deviate from the optimal ratios, often they are larger than the effect on GPP (as maintenance respiration is coupled to the leaf nitrogen concentration, a lower N concentration means lower Vcmax and lower respiration). 
    53 As growth limitation is not handled correctly, it is not possible to derive any conclusion from simulations prescribing non-optimal ratios regarding nutrient limitation on vegetation. (apparently you just modified the value of Vcmax via leaf nitrogen concentration). 
    5449 
    55 At the moment, I have no idea how to fix this in a feasible way. 
    56