Changes between Version 120 and Version 121 of DevelopmentActivities/ORCHIDEE-DOFOCO

Timestamp:

2017-06-20T13:46:50+02:00 (8 years ago)

Author:

luyssaert

Comment:

--

DevelopmentActivities/ORCHIDEE-DOFOCO

@@ -42 +42 @@
 Age classes were defined as separate PFTs and if wanted different age classes of the same PFT could be run with different parameters. This option has not been tested yet because it is expected to result in discontinuities when the biomass is moved from one age class to another. The number of age classes is fixed but for each PFT it can be decided whether age classes are used or not. This adds a lot of flexibility to the model. ORCHIDEE-CAN, for example, has been run with 64 PFTs, using age classes for European forest and using no age classes for all forests outside the domain of interest. Setting-up a simulation with age classes will require some thinking when setting-up the run.def. A python-script was written to create this kind of run.def. Increasing the number of PFTs has important consequences for the speed of the model and the memory use. Because a single run can contain PFTs with and PFTs without age classes, processing of the simulation output needs to account for the relationship between PFTs of the same species but a different age class.
 
-The number of age classes is defined by the parameter '''NAGEC'''. Setting this parameter to 1 is a good start unless you have a special interest in using age classes.
- 
+The number of age classes is defined by the parameter '''NAGEC'''. Setting this parameter to 1 is a good start unless you have a special interest in using age classes. When NAGEC is set to more than 1, '''PFT_TO_MTC'''', '''AGEC_GROUP''' and '''PFT_NAME''' will all need to be carefully defined. See the attached run.def for a functional example. See below for some principles:
+NAGEC = 2
+Assume we want to use two age classes in the tropical evergreen forest (default PFT 2). We will end-up with 14 PFTs, the 13 default PFTs and the 14the which is used as an age class for tropical evergreen forest
+PFT_TO_MTC_01 = 1
+PFT_TO_MTC_02 = 2
+PFT_TO_MTC_03 = 2
+PFT_TO_MTC_04 = 3
+PFT_TO_MTC_05 = 4
+...
 
+Now we need to inform ORCHIDEE that PFT 2 and PFT 3 are age classes from each other
+AGEC_GROUP_01 = 1
+AGEC_GROUP_02 = 2
+AGEC_GROUP_03 = 2
+AGEC_GROUP_04 = 3