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- Model:VIC + (The VIC model is a large-scale, semi-distr … The VIC model is a large-scale, semi-distributed hydrologic model. As such, it shares several basic features with the other land surface models (LSMs) that are commonly coupled to global circulation models (GCMs):</br></br>The land surface is modelled as a grid of large (>1km), flat, uniform cells</br>Sub-grid heterogeneity (e.g. elevation, land cover) is handled via statistical distributions.</br>Inputs are time series of daily or sub-daily meteorological drivers (e.g. precipitation, air temperature, wind speed).</br>Land-atmosphere fluxes, and the water and energy balances at the land surface, are simulated at a daily or sub-daily time step</br>Water can only enter a grid cell via the atmosphere</br>Non-channel flow between grid cells is ignored</br>The portions of surface and subsurface runoff that reach the local channel network within a grid cell are assumed to be >> the portions that cross grid cell boundaries into neighboring cells</br>Once water reaches the channel network, it is assumed to stay in the channel (it cannot flow back into the soil)</br>This last point has several consequences for VIC model implementation:</br></br>Grid cells are simulated independently of each other</br>Entire simulation is run for each grid cell separately, 1 grid cell at a time, rather than, for each time step, looping over all grid cells</br>Meteorological input data for each grid cell (for the entire simulation period) are read from a file specific to that grid cell</br>Time series of output variables for each grid cell (for the entire simulation period) are stored in files specific to that grid cell</br>Routing of stream flow is performed separately from the land surface simulation, using a separate model (typically the routing model of Lohmann et al., 1996 and 1998)the routing model of Lohmann et al., 1996 and 1998))