Changes between Version 84 and Version 85 of DevelopmentActivities/ORCHIDEE-CNP

Timestamp:

2016-03-10T11:05:02+01:00 (8 years ago)

Author:

dgoll

Comment:

--

DevelopmentActivities/ORCHIDEE-CNP

@@ -26 +26 @@
 In such a case, we have to add artificially the needed amount of nutrients to the supply. The flag ok_spunup controls that only in the timestep after the analytical solution is derived nutrients can be added.
 
-=== 2.1B avoid that immobilisation demand exceeds mineral nutrient supply ===
+=== WORKS 2.1B avoid that immobilisation demand exceeds mineral nutrient supply ===
 During the an analytic spinup cycle the immobilisation demand can exceed the mineral nutrient supply (soil_n_min or soil_p_min).
 In such a case, we have to add artificially the needed amount of nutrients to the supply. Every time it is needed during spinup.
+
 === 2.2 prescribed N inputs from BNF during the spinup ===
 The biological fixation of N2 from the atmosphere is computed as a function of NPP and plant C:N:P stoichiometry. During the spinup large amounts of organic matter accumulate which is connected with a high immobilisation flux. We thus must ensure that the N inputs are rather high and constant in time. Therefore we read BNF rates in from a file rather than computing them dynamically.
@@ -44 +45 @@
 When using the analytical spinup the BNF must be read in from a file to speed up the spin up. The file should contain the reference BNF rates for the respective climatic conditions.
 Such files are currently missing, but should be generated as soon as the model is ready.
+
+
+=== 3.3 Respiration from labile carbon  ====
+The original formulation of the burning of excess labile carbon was removed by DOFOCO team, to ensure forest grow back after coppicing. 
+This means that labile carbon can accumulated in plants forever without any restrictions as there is no respiration costs associated with this carbon. 
+Thus, nutrient limitation on allocation will lead to accumulation of labile carbon as long as plants can sustain some leaves.
+
+To fix this: I re-introduced the burning of excess labile carbon following Zaehle & Post (2010). It helps to avoid the accumulation of labile carbon; but more tests are needed, in particular FLUXNET site scale evalution is needed.
+
+
+
+
 
 == 4. New input files ==