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

Timestamp:

2016-11-06T11:50:37+01:00 (7 years ago)

Author:

dgoll

Comment:

--

DevelopmentActivities/ORCHIDEE-CNP

@@ -46 +46 @@
 Using 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. 
 
+The 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. 
+The 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. 
+
+I 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.
+
+To 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.
+It 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).
 
 == 5. New input files ==