Changes between Version 112 and Version 113 of DevelopmentActivities/ORCHIDEE-CNP


Ignore:
Timestamp:
2016-08-24T16:39:10+02:00 (8 years ago)
Author:
dgoll
Comment:

--

Legend:

Unmodified
Added
Removed
Modified

  • DevelopmentActivities/ORCHIDEE-CNP

    v112 v113  
    3535'''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. 
    3636 
    37 '''2016/08/08''': The OCN anaerobic microsites reduce soil mineral N levels for 4 test sites. 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.  
    38  
    39 '''2016/08/08''': The OCN denitrification is a simplification of the one in ORCHIDEE-CN (DNDC) avoiding instability related to bacterial growth. Without prescribing maximal and minimal bacterial population sizes the ORCHIDEE-CN formulation leads to the extinction of bacteria and thus to zero denitrification. The more elegant simplification in OCN is thus preferable. 
     37'''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.  
    4038 
    4139 
     40'''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. 
    4241 
     42'''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. 
     43 
     44 
     45  
    4346=== 3.3 Biological N2 fixation (BNF) === 
    4447=== 3.3.1 Modified Cleveland et al. (1999) scheme ===