ssd2rad {marelac}

Estimate Global Radiation from Measured Sunshine Duration Time

Description

The function converts values of sunshine duration (in hours) to global radiation (in J m^{-2} s^{-1}).

Usage

ssd2rad(S, doy, a = 0.25, b = 0.5, rho = 50.29)

Arguments

S

Sunshine duration (hours)

doy

Julian day (for northern hemisphere only)

a, b, rho

site specific conversion parameters, must be fitted to measured data.

Value

Estimated value of global radiaton in J m^{-2} s^{-1}.

Note

Don't forget to fit the function parameters to site specific values!

References

Dyck S and Peschke G., 1995. Grundlagen der Hydrologie. 3. Auflage. Verlag f?r Bauwesen, Berlin 1995, ISBN 3-345-00586-7.

See Also

coriolis, viscosity, diffcoeff, vertmean, gravity

Examples

ssd2rad(8, 120)