Prognostic canopy air space solutions for land surface exchanges
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Three generations of land surface models have been developed over the course of the last twenty years, which include increasing levels of complexity. The latest generation incorporates photosynthesis and physiological responses to environmental CO2, a gas that is strongly controlled by atmospheric vertical stability and by land surface exchanges. A new set of prognostic equations, providing a new solution core for one such land surface model, SiB2, is introduced here. The new equation set makes use of canopy air space variables which are prognostic and allow for the storage of heat, water and carbon at that level, providing both a new memory for the coupled system and a better representation of observed canopy processes. Results from off-line simulation using FLUXNET data from Europe, over a range of environmental and climatic conditions, indicate that the new solution core is able to represent land surface exchanges with equal or better skill than the set it replaces. At the same time, this new formulation provides a simplified mathematical framework, more suitable for further model development.
KeywordsWaste Water Photosynthesis Land Surface Space Solution Couple System
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