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what is evaporation influenced by?
topography, land use, meteorology, water availability..
what is the most important component of the water balance?
evapotranspiration
evaporation impacts..
water availability, hydrograph shape and peaks
solar constant
solar declination
I0=1366 W/m2
delta= 23.45°
equation of radiation
Ri = Rr + Ra + Rt
incoming = reflection + absorbtion + transmission
what causes diffuse radiation?
scattering of incoming radiation
Rsw = Rdir + Rdif
Radiation at the top of the atmosphere?
and on the surface?
Rsw = I0/4 = 342 W/m2 (due to shape and night)
surface = 188 W/m2
kirchhoffs law
R1/a1=R2/a2 or R1/e1=R2/e2
a: absorptivity, e: emissivity
"a good reflector is a bad emitter"
a=1 -> black body
