1. Regional Hydro-Ecologic Simulation System (RHESSys) Christina Tague Bren School of environmental science and management University of California, Santa Barbara http://fiesta.bren.ucsb.edu/~rhessys

2. Vertical drainage

3. Lateral drainage

4. Carbon and Nitrogen cycling Energy (radiation), carbon, nitrogen and water balance Stand competition for water, light, nutrients Feedback between NPP, growth, phenology, and soil biogeochemical cycling

5. Spatial Hierarchy Basin Hillslope (within basin) Drainage Organization Zone (within hillslope) Meteorology & Energy Patch (within zone) Soil & Litter Strata (vertical within patch) Vegetation overstory understory

6. Parameter Files Library of parameters:  Vegetation  Soils  Zone processes  Land use Time Series Files Required: Temperature & Precipitation  Single station interpolation  Gridded climate data Optional – many additional WORLDFILE Populated spatial hierarchy FLOWTABLE Connectivity between patches TEC FILE Temporal event control ID’s link each object to the input information Output (~100 store/flux variables) Daily, Monthly, Yearly BGC, Hydro Basin, Hillslope, Zone, Patch, Stratum RHESSys Process based sub-models MODEL Template Initialize state variables GIS (GRASS) G2W CF9 INPUTS

7. Zone level: Required  Minimum daily temperature  Maximum daily temperature  Precipitation Zone level: Optional  Day length  Duration of rainfall  Incoming longwave radiation  Incoming direct shortwave radiation  Incoming diffuse shortwave radiation  Nitrogen deposition as N03  Nitrogen deposition as N0H4  Incoming direct PAR radiation  Incoming diffuse PAR radiation  Relative humidity  Mean daytime temperature  Night time temperature at sundown  Soil temperature  Vapor pressure deficit  Wind speed  Carbon dioxide  Minimum temperature lapse rate  Maximum temperature lapse rate Patch level: Optional  Irrigation  Fertilizer N03  Fertilizer NH4 Time Series Data

8. Calibrated soil drainage parameters

9. Modeling the Urban landscape