Community Land Model (CLM)
Improvements
Proposed hydrology related improvements to be discussed at March 14-15, 2005 LMWG meeting
- Infiltration (enhancement factor, macropores)
- Surface runoff
- Vertical movement of soil water (hydraulic conductivity, hydraulic lift, macropores)
- Soil water effects on transpiration (soil moisture stress functions, root distribution
- Drainage (lateral and base flow)
- Ground to canopy air evaporation.
- Canopy interception (scale current parameterization, account for subgrid-scale distribution of precipitation
- Sunlit/shaded canopy model for photosynthesis/conductance/transpiration.
- Increase upper bound on snow water and initial snow water on land ice.
Suggested by S. Ghan.
- Prognostic canopy air space (to be discussed on second day).
Suggested by S. Denning, I. Baker.
Other proposed improvements.
- Snow cover fraction formulation (fraction of bare soil covered by snow)
Suggested by Z.-L. Yang, G.Y. Niu.
- Improve 2-m temperature formulation (stability fixes are complete. Inclusion of grass tile suggested to match observation conditions).
Suggested by R. Dickinson.
- Improve leaf temperature iteration
Suggested by G. Wang.
- Implement an impedance factor for hydraulic conductivity of frozen soil and/or implement physically realistic approach for soil matric potential when water/ice mixture is present in soil.
Suggested by Y.-J. Dai.
- Remove soil layer hardwires for drainage calculations.
Suggested by Z.-L. Yang, P. Houser, M. Bosilovich.
- Soil freezing point modifications
Suggested by Z.-L. Yang.
- Implement a new method for modeling heterogeneous soils.
Suggested by K. Schaudt.
- Adjust the calculation of thermal conductivity between soil and snow.
Suggested by Y.-J. Dai.