CLASS

 

Canadian La nd S urface S cheme


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The Canadian Land Surface Scheme (CLASS) is a SVAT being developed in a research project led by D. Verseghy at the Canadian Atmospheric Environment Service. The work is funded through the Canadian Climate Research Network, part of the Climate Institute at the University of Victoria. The eventual goal is to link CLASS to the Canadian General Climate Model (GCM).  The Queen's group is one of several university-based groups that comprise the collaborative research team, and we are tasked to examine CLASS's performance over forested surfaces. Our data archive from Chalk River and BOREAS formed the basis of the initial three years of development work, completed in 1997. Our participation in the BERMS project is part of the CLASS Follow-on project (97-99). 

Paul Bartlett, a Ph.D. . student at Queen's is working on the CLASS project for his doctoral thesis. The results of the initial testing of the model for mid-latitude mixed forest (PNFI), an aspen-birch stand (AECL), and a boreal young jack pine (BOREAS) have been submitted to Atmosphere-Ocean, and the reference appears below with an attached abstract. 


The BERMS work will further the development of CLASS and especially the stomatal conductance routines. At present in CLASS, the behaviour of stomatal conductance is modelled with a Jarvis-Stewart type series of equations, and we are exploring the use of a Ball-Berry type model for possible inclusion in the model in the future. 


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