1. Simple Sensitivity Analysis of Community Land Model using data from Sleepers River Watershed Hydroclimatology Spring 2004 Dana Derickson, Sarah Doyle, Kelley Keese, Erick Leuro, Scout Skillman

2. Introduction Sensitivity analysis on model created for the Sleepers River watershed in VermontSensitivity analysis on model created for the Sleepers River watershed in Vermont Vegetation ( ↑, ↓ in LAI; grasses → trees)Vegetation ( ↑, ↓ in LAI; grasses → trees) Soils (clay, sand)Soils (clay, sand) Increasing Temperature by 2 degreesIncreasing Temperature by 2 degrees 1-D model representative of a subwatershed (8.4 km 2 )1-D model representative of a subwatershed (8.4 km 2 ) Characterized by C3 arctic and non-arctic grasses with a maximum LAI of 3.5 and silty soilsCharacterized by C3 arctic and non-arctic grasses with a maximum LAI of 3.5 and silty soils

3. Forcing Data 5 years of forcing data from 1969 – 19745 years of forcing data from 1969 – 1974 Hourly intervalsHourly intervals Air temperatureAir temperature PrecipitationPrecipitation Specific HumiditySpecific Humidity Wind speedWind speed Incoming solar radiationIncoming solar radiation Incoming longwave radiationIncoming longwave radiation Focused on the year of 1973Focused on the year of 1973

4. Monthly Average Climate Data Sleepers River Watershed (1973)

5. Monthly Average Climate Data Sleepers River Watershed (1973)

6. Monthly Average Climate Data Sleepers River Watershed (1973)

7. CLM Model

8. Predicted Outcome based on the energy budget (↑ S - ↓S) – (↑ L - ↓L) = LE + SE + G C1: No Veg ↓ R n b/c albedo ↑ with absence of canopy ↓ SH and G b/c less R n ↑ in ground E flux but no T flux nor canopy E→ ↓ LE ↑ SMC

9. Absorbed Solar Radiation

10. Absorbed Infrared Longwave Radiation

11. Sensible Heat Flux

12. Ground Evaporation

13. Canopy Evaporation

14. Canopy Transpiration

15. Soil Moisture Content

16. Predicted vs. Actual Results