Impact model: CLM-Crop


CLM-Crop is one of the 14 models following the ISIMIP2a protocol which form the base of simulations for the ISIMIP2a agricultural sector outputs; for a full technical description of the ISIMIP2a Simulation Data from Agricultural Sector, see this DOI link:

Information for the model CLM-Crop is provided for the simulation rounds shown in the tabs below. Click on the appropriate tab to get the information for the simulation round you are interested in.

Person responsible for model simulations in this simulation round
Andrew D. Jones:, Lawrence Berkeley National Laboratory (USA)
Peter Lawrence:, 0000-0002-4843-4903, National Center for Atmospheric Research (USA)
Output Data
Experiments: historical
Climate Drivers: None
Date: 2016-02-10
Basic information
Model Version: CLM 4.5 with mods by slevis and lawrence
Reference Paper: Main Reference: Drewniak, B. et al. Modeling agriculture in the Community Land Model. Geoscientific Model Development Discussions,5,4137-4185,2012
Reference Paper: Other References:
Spatial aggregation: regular grid
Horizontal resolution: 0.5°x0.5°
Input data
Observed atmospheric climate data sets used: WATCH-WFDEI
Key input and Management
Crops: cot, mai, ric, sug, soy, whe
Land cover: Lawrence et al. (2012), Portmann et al. (2010)
Planting date decision: Simulate planting dates according to climatic conditions
Planting density: Planting density=1
Crop cultivars: requirements and vernalization requirements computed based on past climate experience
Fertilizer application: N
Irrigation: MIRCA 2000
Crop residue: Residue removed to litter pool
Initial soil water: Spin up
Initial soil nitrate and ammonia: Spin up
Initial soil c and om: Spin up
Initial crop residue: Spin up
Key model processes
Leaf area development: Dynamic simulation based on development and growth processes
Light interception: Detailed approach
Light utilization: Detailed (explanatory) Gross photosynthesis – respiration, (for more details, see e.g. Adam et al. (2011))
Yield formation: partitioning during reproductive stages
Crop phenology: temperature & photoperiod (day length)
Root distribution over depth: exponential
Stresses involved: Water stress, Nitrogen stress, Heat stress
Type of water stress: soil available water in root zone
Type of heat stress: vegetative (source)
Water dynamics: Water table with 10 soil layers
Evapo-transpiration: Turbulent Flux – Farquhar et al 1980
Soil cn modeling: C model / N model
Co2 effects: Leaf-level photosynthesis-rubisco or on QE and Amax, Transpiration efficiency