| Moisture processing at the land surface in CCCma AGCM3 (2007) | |||||||||||||
Abstract | |||||||||||||
| Precipitation is intercepted, and moisture is stored and exchanged between three land-surface moisture reservoirs, namely the ground, the snow, and the canopy. The role that these moisture reservoirs play in partitioning precipitation into evapotranspiration and runoff at global and regional scales is investigated by analysing seventeen years of monthly data from an AMIP 2 simulation made with Canadian Centre for Climate Modelling and Analysis (CCCma) third-generation atmospheric general circulation model (AGCM3). The CCCma AGCM3 follows CCCma second-generation GCM described by McFarlane et al. (1992). Dynamic terms in the model are calculated at triangular T47 spectral resolution, and the physical terms on a 96 × 48 (~3.75°) horizontal grid. The vertical domain extends to 1 hPa and contains 32 layers. AGCM3 includes the Canadian Land Surface Parameterization Scheme (CLASS) a new module for treatment of land surface processes (Verseghy, 1991), amongst other new features. AMIP 2 is an extension of AMIP 1 with improvements in experimental design and diagnosis of expanded set of model output variables. The AMIP 2 simulation covers the 17 year period (1979-1995) for which the lower boundary conditions of monthly sea surface temperatures and sea-ice concentrations are specified. Table 1: Globally averaged mean annual model and observed precipitation and runoff over land in mm/day. | |||||||||||||
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