Changes between Version 121 and Version 122 of DevelopmentActivities/ORCHIDEE-CNP


Ignore:
Timestamp:
2016-11-06T11:50:37+01:00 (8 years ago)
Author:
dgoll
Comment:

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  • DevelopmentActivities/ORCHIDEE-CNP

    v121 v122  
    4646Using as a guide rough ranges of observation-based estimates of aboveground biomass, LAI, CUE,  and biomass turnover, we manipulated parameters of the pipe model (TAU_SAP, KLATOSA_MIN, K_LATOSA_MAX) as well as the inversion of the rate constant for tree turnover RESIDENCE_TIME.  
    4747 
     48The main issue here is, that FLUXNET GPP & energy fluxes as well as LAI estimates are poor constraints on biomass and biomass turnover when calibrating the ORCHIDEE-CAN parameter.  
     49The range of K_LATOSA prescribed is problematic as total biomass is very sensitive to the actual values of K_LATOSA. The wider the K_LATOSA range the wider the total biomass range.  
     50 
     51I derived a set of parameters which result in kind of okay LAI, total biomass, biomass turnover and CUE. Still some PFTs behave not really realistic, like DBF PFTs. 
     52 
     53To facilitate the calibration I derive maintenance respiration only from leaf N and not from sapwood N too. This allows to manipulate total biomass via K_LATOSA without affecting the CUE. 
     54It would be better to have it coupled as this adds a constraint to K_LATOSA. Best would be to include even more constraints on K_LATOSA for example hydrological constraints (like the stuff Emilie develops). 
    4855 
    4956== 5. New input files ==