GEOFRAMECafe Stefano Della Chiesa

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GEOFRAMECafe Stefano Della Chiesa

  1. 1. 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_stn Results 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 m fc=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).
  2. 2. Fig 1 Reference simulation stb_stn004f Flat, fc=05, zo=0.1 m
  3. 3. Fig 3 Sensitivity to aspect stb_stn004f-004s-004n Flat 30 o S 30 o N
  4. 4. Fig 4 Sensitivity to canopy fraction fc stb_stn007-008 fc=1 fc=0.5 fc=0
  5. 5. Fig 5 Sensitivity to roughness length zo stb_stn007-008 zo=0.001 m zo=0.1 m zo=1 m
  6. 6. Fig 9 Sensitivity to soil thermal properties effect 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
  7. 7. Fig 10 Sensitivity to soil thermal properties effect 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)
  8. 8. Fig 11 Sensitivity to air temperature stb_stn016-017 BASE <ul><li>- see Table in inpts-stb_stn004.xls </li></ul><ul><li>- a change in Ta simply translates Ts </li></ul><ul><li>very little change in fluxes (less than 2 W/m2 ); </li></ul><ul><li>Ts quickly adapts itself to the new Ta </li></ul><ul><li>- if Ta increase very slight decrease of LE and G, decrease of H </li></ul><ul><li>- 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 </li></ul>TA + 2C TA - 2C
  9. 9. Getop land cover parameterization - a sensitivity analysis Study area: Neustift Date of simulation: September 1999 run  10 days   LU parameters Soil parameters r/c 1 forest r/c 1 grass 5 1 Zo ow min 5 zo 0,02 6 10 hc m 6 0,2 hc m 7 10 hc/zo 7 10 hc/zo 9 1 fc 9 1 fc 10 250 root mm 10 150 root mm 11 6 LAI 11 5 LAI 12 0,2 albedo 12 0,2 albedo 14 50 sigma K 14 30 sigma K 15 20 h_sup 15 10 h_sup             r/c 1 bare soil r/c 1 rocks 1 7 lu 1 8 lu 2 1 rough 2 1 rough 3 1 zo rough 3 10 zo rough 4 10 zo snow 4 10 zo snow 12 0,2 albedo 12 0,2 albedo 13 1 C_m 13 1 C_m 14 1 sigma K 14 1 sigma K 15 1 h_sup 15 1 h_sup r/c 1 forest r/c 1 grass 1 1 ClasseSoil 1 2 ClasseSoil 2 1,00-02 Kh_sat 2 1,00E-03 Kh_sat 3 0,15 teta_r 3 0,05 teta_r 4 0,5 teta_sat 4 0,4 teta_sat 7 0,74 k_solid 7 1 k_solid 8 2,16E-06 c_solid 8 2,16E+06 c_solid 9 0,2 teta_wp 9 0,15 teta_wp 10 0,3 teta_fc 10 0,3 teta_fc     r/c 1 bare soil r/c 1 rocks 1 7 ClasseSoil 1 8 ClasseSoil 2 1,00E-04 Kh_sat 2 1,00E-06 Kh_sat 3 0,1 teta_r 3 0,02 teta_r 4 0,4 teta_sat 4 0,025 teta_sat 7 1,5 k_solid 7 4 k_solid 8 2,16E+06 c_solid 8 2,16E+06 c_solid 9 0,15 teta_wp 9 0,03 teta_wp 10 0,2 teta_fc 10 0,08 teta_fc
  10. 10. Inputs: hydraulic conductivity
  11. 11. Inputs: Soil water content
  12. 12. Forest Rocks Bare Soil Grass
  13. 13. Forest Rocks Bare Soil Grass
  14. 14. Tair Tsurface Forest Rocks Bare Soil Grass
  15. 15. Forest Rocks Bare Soil Grass
  16. 16. Forest Rocks Bare Soil Grass
  17. 17. Forest Rocks Bare Soil Grass
  18. 18. Forest Rocks Bare Soil Grass

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