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Tab 1 SENSITIVITY ANALYSIS
stb_stn
Objective:We choose here an inclined or flat plane domain to perform plot scale simulations, to check the sensitivity of the energy balance partition to slope, vegetation properties, initial conditions.
Simulations name: stb_stnResults folders:- Results elaborations in: /Users/giacomo/EURAC/Stubai/Results/stb_stn/stb_stn.ppt- Figures saved in: /Users/giacomo/EURAC/Stubai/Results/stb_stn/Figures/ - Matlab elaborations in: /Users/giacomo/GeoMatlab/Mfiles_points/
load_sensitivity.m plot_sensitivity.m- Input inclined DTM in: /Users/giacomo/EURAC/Stubai/Inputs/Piano.xls- Parameters settings in: /Users/giacomo/EURAC/Stubai/Inputs/Inpts_stb_stn004.xls- Simulations index in: /Users/giacomo/EURAC/Stubai/Simulations/sim_stb_stn.txt
Simulation assumptions:- Flat (or inclined) 11x11 dtm- Forcing as stb_tot simulations (Clear sky days in September 1999)- Reference simulation with intermediate parameters (stb_stn004f)
zo=0.1 m; do=0.66 mfc=0.5(for all parameters see 'sensitivity' in Inpts_stb_stn004.xls)
- Saturated initial conditions, 10 days spin up.- Soil parameters as in Neustift station soil (very organic soil at the surface).
Fig 1 Reference simulation
stb_stn004f
Flat, fc=05, zo=0.1 m
Fig 3 Sensitivity to aspect
stb_stn004f-004s-004n
Flat30o S 30o N
Fig 4 Sensitivity to canopy fraction fc
stb_stn007-008
fc=1 fc=0.5 fc=0
Fig 5 Sensitivity to roughness length zo
stb_stn007-008
zo=0.001 m zo=0.1 m zo=1 m
Fig 9 Sensitivity to soil thermal propertieseffect on surface fluxes
stb_stn013-015
k_solid = 8.5 W/(m K) c_solid = 2.16 E6 J/(m^3 K)
k_solid = 0.5 W/(m K) c_solid = 2.16 E6 J/(m^3 K)
k_solid = 0.5 W/(m K) c_solid = 1 E6 J/(m^3 K)
k_solid = 8.5 W/(m K) c_solid = 1 E6 J/(m^3 K)
Very little effect on surface fluxes
Fig 10 Sensitivity to soil thermal propertieseffect on surface temperature
stb_stn013-015
k_solid = 8.5 W/(m K) c_solid = 2.16 E6 J/(m^3 K)
k_solid = 0.5 W/(m K) c_solid = 2.16 E6 J/(m^3 K)
k_solid = 0.5 W/(m K) c_solid = 1 E6 J/(m^3 K)
k_solid = 8.5 W/(m K) c_solid = 1 E6 J/(m^3 K)
Strong effect of soil conductivity
on surface temperature, especially the
night ones (low soils with low
conductivity, as limestone and
organic ones (or dry grass) have
very low nocturnal skin temperatures and higher daily
ones)
Fig 11 Sensitivity to air temperature
stb_stn016-017
BASE
- see Table in inpts-stb_stn004.xls- a change in Ta simply translates Ts- very little change in fluxes (less than 2 W/m2);- Ts quickly adapts itself to the new Ta - if Ta increase very slight decrease of LE and G, decrease of H- very simplistic conclusion: if only Ta changes, does no change the energy forcing,what does it change is - the frozen / unfrozen threshold and the consequent phenology - the competitive advantage among species
TA + 2C TA - 2C
Difference - "+ 2 C"
Difference - "- 2 C"
Ta 2 -2 CRn 1 -1 W m^-2H -2 3 W m^-2
LE 2 -2 W m^-2G 2 -2 W m^-2
r/c 1forest r/c 1grass5 1Zoow min 5 zo0,026 10hc m 6 0,2hc m7 10hc/zo 7 10hc/zo9 1fc 9 1fc
10 250root mm 10 150root mm11 6LAI 11 5LAI12 0,2albedo 12 0,2albedo14 50sigma K 14 30sigma K15 20h_sup 15 10h_sup
r/c 1bare soil r/c 1rocks
1 7lu 1 8lu2 1rough 2 1rough3 1zo rough 3 10zo rough4 10zo snow 4 10zo snow
12 0,2albedo 12 0,2albedo13 1C_m 13 1C_m14 1sigma K 14 1sigma K15 1h_sup 15 1h_sup
Getop land cover parameterization - a sensitivity analysis
Study area: Neustift Date of simulation: September 1999 run 10 days
r/c 1forest r/c 1grass1 1ClasseSoil 1 2ClasseSoil2 1,00-02Kh_sat 2 1,00E-03Kh_sat3 0,15teta_r 3 0,05teta_r4 0,5teta_sat 4 0,4teta_sat7 0,74k_solid 7 1k_solid8 2,16E-06c_solid 8 2,16E+06c_solid9 0,2teta_wp 9 0,15teta_wp
10 0,3teta_fc 10 0,3teta_fc
r/c 1bare soil r/c 1rocks1 7ClasseSoil 1 8ClasseSoil2 1,00E-04Kh_sat 2 1,00E-06Kh_sat3 0,1teta_r 3 0,02teta_r4 0,4teta_sat 4 0,025teta_sat7 1,5k_solid 7 4k_solid8 2,16E+06c_solid 8 2,16E+06c_solid9 0,15teta_wp 9 0,03teta_wp
10 0,2teta_fc 10 0,08teta_fc
LU parameters Soil parameters
Inputs: hydraulic conductivity
Kv_sat mm/s
-600
-500
-400
-300
-200
-100
00.000001 0.00001 0.0001 0.001 0.01 0.1 1
Theta_r
Z mm
1A - ROCk
2A - SOIL
3A - GRASS
4A - FOREST
Inputs: Soil water content
Theta_r
-600
-500
-400
-300
-200
-100
00 0.1 0.2 0.3 0.4 0.5
Theta_r
Z mm
1A - ROCk
2A - SOIL
3A - GRASS
4A - FOREST
Theta_s
-600
-500
-400
-300
-200
-100
0
0 0.1 0.2 0.3 0.4 0.5
Theta_r
Z mm
1A - ROCk
2A - SOIL
3A - GRASS
4A - FOREST
Forest
Rocks Bare Soil
Grass
Forest
Rocks Bare Soil
Grass
Tair Tsurface
Forest
Rocks Bare Soil
Grass
Forest
Rocks Bare Soil
Grass
Forest
Rocks Bare Soil
Grass
Forest
Rocks Bare Soil
Grass
Forest
Rocks Bare Soil
Grass
