Changes between Version 113 and Version 114 of DevelopmentActivities/ORCHIDEE-CNP

Timestamp:

2016-08-24T16:49:37+02:00 (8 years ago)

Author:

dgoll

Comment:

--

DevelopmentActivities/ORCHIDEE-CNP

@@ -35 +35 @@
 '''2016/08/24''': When rain rain drainage is activated N losses are so high, that mineral N pools are close to zero. The parametrisation of rain drainage is anyway not needed for the 11 layer hydrology so I will not take over the rain drainage losses from OCN.
 
-'''2016/08/24''': The OCN anaerobic microsites reduce soil mineral N levels for 4 test sites to levels which are reasonable. We take over anaerobic micro sites following OCN. The approach of OCN is a simplification of the one in ORCHIDEE-CN (DNDC) avoiding instability related to the diffusion term. In respect of global application of the model, without stability in calculations a superior process representation is useless. 
+'''2016/08/24''': The OCN anaerobic microsites reduce soil mineral N levels for 4 test sites to levels which are reasonable.  The approach of OCN is a simplification of the one in ORCHIDEE-CN (DNDC) avoiding instability related to the diffusion term. In respect of global application of the model, without stability in calculations a superior process representation is useless. We thus take over anaerobic micro sites following OCN.
 
 
-'''2016/08/24''': The OCN denitrification is a simplification of the one in ORCHIDEE-CN (DNDC) avoiding instability related to bacterial growth. There we do not need to prescribe maximal and minimal bacterial population sizes the ORCHIDEE-CN formulation to avoid the extinction of bacteria and thus to zero denitrification. The more elegant simplification in OCN compared is in general preferable to prescribing range. Soil mineral NO3 levels show drastically reduced daily variability using OCN formulation while NO3 stocks are comparable. We thus take over the OCN formulation.
+'''2016/08/24''': The OCN denitrification is a simplification of the one in ORCHIDEE-CN (DNDC) avoiding instability related to bacterial growth. We need to prescribe maximal and minimal bacterial population sizes in the ORCHIDEE-CN formulation to avoid the extinction of bacteria and thus to zero denitrification. The more elegant simplification in OCN is in general preferable than prescribing ranges. Soil mineral NO3 levels show a drastically reduced daily variability with the OCN formulation while NO3 stocks are comparable to the stocks in ORCHIDEE-CN. We thus take over the OCN formulation.
 
-'''2016/08/24''': The OCN nitrification compared to ORCHIDEE-CN (DNDC) uses a simplified temperature response function and a higher linear scaling factor (1.2 (?) compared to 0.2 (Schmidt et al. 2000)) as NO3 levels are commonly much lower than NH4 in ORCHIDEE-CN a higher nitrification rates as in OCN makes sense in general. We thus take of the OCN formulation.
+'''2016/08/24''': The OCN nitrification compared to ORCHIDEE-CN (DNDC) uses a simplified temperature response function and a higher linear scaling factor (1.2 (not sure from where SZ took this value) compared to 0.2 (Schmidt et al. 2000)). As the NO3 levels are commonly much lower than NH4 in ORCHIDEE a higher baseline nitrification rate as in OCN makes sense. We thus take of the OCN formulation.