Net shortwave irradiance SW_NET

The difference between the downward SW_d and upward SW_u flux of shortwave irradiance in the 300-4000 nm wavelength range. Values are expressed in [Wm^-2]. The SatBałtyk System  provides maps of mean daily values of the short-wave radiation budget with a spatial resolution of 1 km.

Methodology

Maps of the short-wave irradiance budget are determined on the basis of mean daily maps of downward and upward short-wave radiation, plotted within the SatBałtyk System (SBRS model [1]).

Validation The statistical error, expressed as the standard deviation of the differences between values measured in situ and those determined using the satellite model for mean daily values, was  σ=9.9 Wm^-2. The systematic error (the mean difference between measured and calculated values) was estimated at 1.5 Wm^-2. The validation was based on empirical data gathered on the Baltic Beta drilling rig in the Baltic Sea (φ=55°28’50.9’’N, λ=18°10’44.7’’E).

Fig. Comparison of mean daily values of the short-wave radiation budget measured SW_NET,real  and calculated SW_NET,model  using the SBRS model [1].

¹ SBRS - Surface Radiation Budget for SatBałtyk