Interactive canopies with Nitrogen controls in the new NCAR land model

The Community Land Model (CLM) is a component of the Community Climate System model (CCSM). Because the water, energy and momentum exchange between the terrestrial ecosystem and the atmosphere are closely related to the plant-atmosphere CO2 exchange and the vegetation physiological situations, it's necessary to include the physiological response of terrestrial vegetation to the climate variation. This poster shows the incorporation of an interactive canopy model in the new land model, CLM2, as derived from an earlier one in BATS. The nitrogen controls on evaportranspiration proposed by Dickinson et al. in 2001 are also included. The leaf stomatal resistance is switched to the scheme in BATS to be consistent with its physiological parameters. Newly introduced parameters are evaluated for the Plant Function Type composition in the CLM2. The simulated energy fluxes are compared with the simulation of the CLM2; and the simulated ecophysiological fluxes and state variables are listed and some of them are compared with values from other sources.