Model intercomparison, Thermal IR spectral region
Line-by-line calculations with provided absorption coefficients
viewing geometry: top of atmosphere, nadir
surface emissivities 1.0, 0.8, 0.5, assuming a Lambertian surface.
output quantity: radiance [W/(m^2 cm-1 sr)]
1. Water vapor band, ~6.2 μm, nadir
2. Spectral window, ~10.8 μm, nadir
3. Spectral window, ~10.0 μm, nadir
Benchmark results
Monochromatic calculations for different viewing angles
Viewing zenith angles: 0°-95° in 1° steps
If possible, spherical geometry, earth radius 6370 km
wavelengths: 6190 nm, 10795 nm
absorption optical thicknesses from LBL calculations above
Benchmark results
ARTS
DISORT
All KOPRA results (spectra for all combinations of angles and emissivities) are provided in the following files, radiance unit is [nW/(cm^2 cm-1 sr)]:
6.2 nm, emi 1.0
6.2 nm, emi 0.8
6.2 nm, emi 0.5
10.0 nm, emi 1.0
10.0 nm, emi 0.8
10.0 nm, emi 0.5
10.8 nm, emi 1.0
10.8 nm, emi 0.8
10.8 nm, emi 0.5
The absorption coefficients have been generated using ARTS based on HITRAN 2004
Midlatitude summer atmosphere was used
Participating RT Solvers: DISORT, ARTS, KOPRA