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: http://doi.org/10.5880/PIK.2017.006

ISIMIP2a

Confirm data for simulation round ISIMIP2a

Person responsible for model simulations in this simulation round

Andrew D. Jones: adjones@lbl.gov, Lawrence Berkeley National Laboratory (USA)

Peter Lawrence: lawrence@ucar.edu, 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: Müller, C., Elliott, J., Kelly, D. et al. et al. The Global Gridded Crop Model Intercomparison phase 1 simulation dataset. Sci Data,6,50,2019

Resolution

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