Simple Sensitivity Analysis of Community Land Model using data from Sleepers River Watershed
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![Page 1: Simple Sensitivity Analysis of Community Land Model using data from Sleepers River Watershed](https://reader036.fdocuments.us/reader036/viewer/2022082611/56812e58550346895d93fec9/html5/thumbnails/1.jpg)
Simple Sensitivity Analysis Simple Sensitivity Analysis of Community Land Model of Community Land Model using data from Sleepers using data from Sleepers
River WatershedRiver Watershed
HydroclimatologyHydroclimatology
Spring 2004Spring 2004
Dana Derickson, Sarah Doyle, Kelley Dana Derickson, Sarah Doyle, Kelley Keese, Erick Leuro, Scout SkillmanKeese, Erick Leuro, Scout Skillman
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IntroductionIntroduction
• Sensitivity analysis on model created for Sensitivity analysis on model created for the Sleepers River watershed in Vermontthe Sleepers River watershed in Vermont• Vegetation ( Vegetation ( ↑, ↓↑, ↓ in LAI; grasses in LAI; grasses →→ trees) trees)• Soils (clay, sand)Soils (clay, sand)• Increasing Temperature by 2 degreesIncreasing Temperature by 2 degrees
• 1-D model representative of a 1-D model representative of a subwatershed (8.4 kmsubwatershed (8.4 km22))
• Characterized by C3 arctic and non-arctic Characterized by C3 arctic and non-arctic grasses with a maximum LAI of 3.5 and grasses with a maximum LAI of 3.5 and silty soilssilty soils
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Forcing DataForcing 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
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Temperature
200
220
240
260
280
300
1 2 3 4 5 6 7 8 9 10 11 12
K
Precipitation
0.00
0.01
0.02
0.03
0.04
0.05
0.06
0.07
1 2 3 4 5 6 7 8 9 10 11 12
m s
-1
Monthly Average Climate Data Monthly Average Climate Data
Sleepers River Watershed (1973)Sleepers River Watershed (1973)
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Downward Longwave and Shortwave Radiation
0
50000
100000
150000
200000
250000
300000
1 2 3 4 5 6 7 8 9 10 11 12
wat
ts m
-2ShortLong
Wind SpeedEast - West, North - South
0.00
0.20
0.40
0.60
0.80
1.00
1.20
1.40
1.60
1.80
1 2 3 4 5 6 7 8 9 10 11 12
m s
-1Monthly Average Climate Data Monthly Average Climate Data
Sleepers River Watershed (1973)Sleepers River Watershed (1973)
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Specific Humidity
0.00
0.00
0.00
0.01
0.01
0.01
0.01
1 2 3 4 5 6 7 8 9 10 11 12
kg/k
g-1
Monthly Average Climate Data Monthly Average Climate Data
Sleepers River Watershed (1973)Sleepers River Watershed (1973)
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CLM ModelCLM Model
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Predicted OutcomePredicted Outcomebased on the energy budgetbased on the energy budget
((↑ S - ↓S) – (↑ L - ↓L) = LE + SE + G↑ S - ↓S) – (↑ L - ↓L) = LE + SE + G
• C1: No Veg
• ↓ Rn b/c albedo ↑ with absence of canopy
• ↓ SH and G b/c less Rn
• ↑ in ground E flux but no T flux nor canopy E→ ↓ LE ↑ SMC
predicted R n LE SH G SMC
No Veg - - - - +LAI doubled + + - + -LAI halved - - + - +Trees + + + + -Clay + + - + +Sand - - + - -Temp + 2K + + + + -
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Absorbed Solar RadiationAbsorbed Solar RadiationAbsorbed Solar Radiation
0
50
100
150
200
250
300
350
1/1 3/2 5/1 6/30 8/29 10/28 12/27
wat
t/m2
BaseNo VegLAI x 2LAI x 0.5claysandTreesTemp + 2
Absorbed Solar Radiation
0
50
100
150
200
250
300
350
400
7/1 7/6 7/11 7/16 7/21 7/26 7/31
wat
t/m2
Base No Veg LAI x 2LAI x 0.5 clay sandTrees Temp + 2
Average Absorbed Solar Radiation for 1973
80 85 90 95 100
BaseNoVegLAIx2
LAI/2clay
sandtreesT + 2
watt/m2
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Absorbed Infrared Longwave RadiationAbsorbed Infrared Longwave RadiationNet Infrared Longwave Radiation
-60
-20
20
60
100
140
180
1/1 3/2 5/1 6/30 8/29 10/28 12/27
wat
t/m2
Base No Veg LAI x 2LAI x 0.5 clay sandTrees Temp + 2
Net Infrared Longwave Radiation
-20
0
20
40
60
80
100
120
140
7/1 7/6 7/11 7/16 7/21 7/26 7/31
wat
t/m2
Base No Veg LAI x 2LAI x 0.5 clay sandTrees Temp + 2
Net Infrared Longwave Radiation for 1973
0 10 20 30 40 50
Base
NoVegLAIx2
LAI/2
clay
sandtrees
T + 2
watt/m 2
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Sensible Heat FluxSensible Heat FluxSensible Heat Flux
-50
0
50
100
150
200
1/1 3/2 5/1 6/30 8/29 10/28 12/27
wat
t/m2
Base No Veg LAI x 2LAI x 0.5 clay sandTrees Temp + 2
Sensible Heat
-70
-20
30
80
130
180
7/1 7/6 7/11 7/16 7/21 7/26 7/31
wat
t/m2
Base No Veg LAI x 2LAI x 0.5 clay sandTrees Temp + 2
Average Sensible Heat Flux for 1973
0 5 10 15 20 25 30
Base
NoVegLAIx2
LAI/2
clay
sandtrees
T + 2
watt/m 2
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Ground EvaporationGround Evaporation
Average Ground Evaporation for 1973
0 10 20 30 40 50
Base
NoVegLAIx2
LAI/2
clay
sandtrees
T + 2
watt/m 2
Ground Evaporation
-50
0
50
100
150
200
250
1/1 3/2 5/1 6/30 8/29 10/28 12/27
wat
t/m2
BaseNo VegLAI x 2LAI x 0.5claysandTreesTemp + 2
Ground Evaporation
0
40
80
120
160
200
7/1 7/6 7/11 7/16 7/21 7/26 7/31
wat
t/m2
Base No Veg LAI x 2LAI x 0.5 clay sandTrees Temp + 2
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Canopy EvaporationCanopy EvaporationCanopy Evaporation
0
20
40
60
80
100
1/1 3/2 5/1 6/30 8/29 10/28 12/27
wat
t/m2
BaseNo VegLAI x 2LAI x 0.5claysandTreesTemp + 2
Canopy Evaporation
0
15
30
45
60
7/1 7/6 7/11 7/16 7/21 7/26 7/31
wat
t/m2
Base No VegLAI x 2 LAI x 0.5clay sandTrees Temp + 2
Average Canopy Evaporation for 1973
0 1 2 3 4 5 6
Base
NoVegLAIx2
LAI/2
clay
sandtrees
T + 2
watt/m 2
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Canopy TranspirationCanopy Transpiration
Average Canopy Transpiration for 1973
0 2 4 6 8 10 12
Base
NoVegLAIx2
LAI/2
clay
sandtrees
T + 2
watt/m 2
Transpiration
0
20
40
60
80
1/1 3/2 5/1 6/30 8/29 10/28 12/27
wat
t/m2
BaseNo VegLAI x 2LAI x 0.5claysandTreesTemp + 2
Transpiration
0
10
20
30
40
50
60
70
80
7/1 7/6 7/11 7/16 7/21 7/26 7/31
wat
t/m2
Base No Veg LAI x 2LAI x 0.5 clay sandTrees Temp + 2
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Soil Moisture ContentSoil Moisture ContentSoil Moisture
0
0.1
0.2
0.3
0.4
0.5
0.6
1/1 3/2 5/1 6/30 8/29 10/28 12/27
mm
/s
Base No Veg LAI x 2LAI x 0.5 clay sandTrees
Soil Moisture
0
0.1
0.2
0.3
0.4
0.5
0.6
7/1 7/6 7/11 7/16 7/21 7/26 7/31
mm
/s
Base No Veg LAI x 2LAI x 0.5 clay sandTrees Temp + 2
Average Soil Moisture Content
0
0.1
0.2
0.3
0.4
0.5
0.6
1 2 3 4 5 6 7 8 9 10layer
Base NoVeg LAIx2LAI/2 clay sandtrees T + 2
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Predicted vs. Actual ResultsPredicted vs. Actual Results
results R n LE SH G SMC
No Veg - + - - =LAI doubled + + = = =LAI halved - - = = =Trees + + = = =Clay = - + = +Sand - - = - -Temp + 2K - + - - =