Changes between Version 153 and Version 154 of DevelopmentActivities/ORCHIDEE-DOFOCO

Timestamp:

2018-02-17T17:20:55+01:00 (6 years ago)

Author:

luyssaert

Comment:

--

DevelopmentActivities/ORCHIDEE-DOFOCO

@@ -300 +300 @@
 Similar to ORCHIDEE-CN, ORCHIDEE-CN-CAN users can choose to use a constant specific leaf area (SLA) or a dynamic (SLA) by setting the flag '''dyn_sla'''. SLA is a fundamental parameter in the allocation scheme and it is well established that SLA is dynamic in nature especially during leaf onset. The current implementation of dynamic SLA is basic and there is room to enhance consistency in the calculations, for example, by recalculation the allocation factors KF and LF as a function of SLA.
 
+=== Spin-up ===
+The analytical spin-up has not been tested with ORCHIDEE-CN_CAN. Given that it does not work for ORCHIDEE-CN, there is no reason to assume it will work for ORCHIDEE-CN-CAN. Note that irrescpective of whether IMPOSE_CN is y or n, some carbon and nitrogen is put into the soil at the first time step (this is done in stomate_io.f90). This approach guarantees that the model will look OK from day one but the soil pools will not be in equilibrium. If the soil carbon and nitrogen needs to be in equilibrium, the recommended approach is to run the model with IMPOSE_CN = y until the soil carbon and soil nitrogen in close to equilibrium. This will ensure that there is enough C and N in all the pools. Then restart the model with IMPOSE_CN = n, n-limitation will now be accounted for (but may take a couple of generations to fully develop). If, after a test run, the equilibrium values are more or less known, the spin-up can be speed-up by setting in the run.def:
+{{{
+SOM_INIT_ACTIVE = 1000
+SOM_INIT_SLOW = 3000
+SOM_INIT_PASSIVE = 3000
+SOM_INIT_SURFACE = 1000
+}}} 
+Where 1000, 3000, 3000 and 1000 are the values retrieved from the test run.
+
 === Stomate ===
 ORCHIDEE-CN-CAN strengthen the links between sechiba and stomate. As in previous versions, stomate makes use of variables calculated in sechiba but in ORCHIDEE-CAN and ORCHIDEE-CN-CAN, sechiba requires information from stomate to work properly. For the moment set '''stomate_ok_stomate''' to y (_AUTOBLOCKER_). For the future it seems possible to prescribe LAI and assume a canopy structure but this code still needs to be restored and tested. For the time being set '''lai_map''' = n.