Changes between Version 143 and Version 144 of DevelopmentActivities/ORCHIDEE-DOFOCO

Timestamp:

2017-06-22T16:24:19+02:00 (7 years ago)

Author:

luyssaert

Comment:

--

DevelopmentActivities/ORCHIDEE-DOFOCO

@@ -174 +174 @@
 ORCHIDEE-CN-CAN strictly follows ORCHIDEE-CN where it concerns the implementation of the N-cycle. Following mass balance problems caused by negative N mineralization and followed by negative immobilization, the code has been slightly adjusted to ensure mass balance closure. The parameter '''ímpose_cn''' is used to control the N-cycle calculations. If set to y, C/N ratios are calculated but whenever N appears to be limiting, it is taken from the atmosphere to satisfy this need. This is the preferred setting when testing/developing the code without a proper spin-up. N-limitation will only be accounted for when setting imnpose_cn = n. With this setting the N-cycle is closed (checked when checking for mass balance closure) it will require a spin-up to produce reasonale results.
 
+=== Photosynthesis ===
+Photosynthesis is calculated as in ORCHIDEE-CAN, and ORCHIDEE-CN but the way the levels are defined has changed. The reason of this change is in the albedo and energy budget for which physical layers are required. For this reason the space between the bottom and the top of the canopy is divided into x layers. X is set by the parameter '''nlevels_photo'''. Applications with ORCHIDEE-CAN used nlevels_photo = 10. This values was retained in ORCHIDEE-CN-CAN. Contrary to ORCHIDEE-CN and previous versions of ORCHIDEE where each canopy layer contained 0.5 units of LAI, in ORCHIDEE-CN-CAN, each canopy layer will have the same depth (in m) but will contain a different amount of LAI because tree canopies are assumed spherical.
+
 === Plant water stress ===
 MENTION 2 OPTIONS