SurfaceHeatFlux

Soil Heat Flux and Storage

The soil heat flux at the surface is calculated by adding the measured flux at a fixed depth, d, to the energy stored in the layer above the heat flux plates
(Campell Scientific "Soil Heat Flux Plate" manual)

More info can be found in the HFP-1 manual on Campbell Scientific's website: http://www.campbellsci.com/hfp01

Calculation Notes

 Sensor Code: SurfaceHeatFlux Sensor: Computed data from 5TM, TCAV, and HFP-1/SC Measurement: Heat flux (Watts / m2)
 Output 1: Heat flux at surface for HFP-1 (Watts/m2) Range 1: -2000 to 2000 Output 2: Heat flux at surface for HFP-1SC (Watts/m2) Range 2: -2000 to 2000 Output 3: Average surface heat flux (Watts/m2) Range 3: -2000 to 2000

Moist soil heat capacity:

= bulk density (For LEO this is  1570 kg/m3)
= density of water (999 kg/m^3)
= the volumetric water content (decimal 0.0 to 0.5)
Cd = heat capacity of dry soil (0.89 kJ/kg/K)
Cw = heat capacity of water (4.179 kJ/kg/K)

Storage term
= change in soil temperature
d = depth
t = output interval

Soil heat flux at the surface,

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