SURFRADSurface Radiation Budget Network
SURFRADSurface Radiation
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Figure 6a shows the observed irradiance during a nearly clear day at one SURFRAD site.
Simulation at the GCM site is especially challenging for most of the experiments; GEOS5-AOD is the only experiment providing results comparable to those at the rest of SURFRAD sites.
To verify this, the AOD recorded by the five multifilter radiometer channels available at the SURFRAD sites (0.4135, 0.4974, 0.6150, 0.6727, and 0.8698 [micro]m) was interpolated to the primary wavelength of 0.550 [micro]m using the observed Angstrom exponent.
Second, code to output surface irradiance at the SURFRAD sites and at every model time step is added to enable direct comparison to WRF-Solar.
Consistent with earlier results, WRF-Solar improves the GHI, DNI, and DIF under clear-sky predictions at all SURFRAD sites.
Fortunately, quantitative measurements of aerosol optical depth (AOD) and cloud cover at SURFRAD sites were available to explain the observed brightening over the US Aerosol optical depth decreased by -0.025 over the 16-year period.