intercomparisons:b4_cloud_ocean
Case B4: Standard atmosphere with cloud layer and underlying ocean surface
This test case includes a standard atmosphere with Rayleigh scattering (as case B1). A cloud layer and an ocean surface is added.
Setup:
- model atmosphere with 30 layers, scattering optical thicknesses provided in tau_rayleigh_800.dat, no molecular absorption
- wavelength: 800 nm
- Rayleigh depolarization factor: 0.03
- Ocean reflectance matrix by Mishchenko's code ocean.shadow.f (uses anti-clockwise convention for azimuth angle!)
- refractive index of water (1.33 + 0i)
- wind speed 2m/s
- cloud layer between 2 and 3 km, optical thickness of 5
- effective radius: 10 <m>mu m</m>
- cloud optical properties: netCDF,ascii
The variable “phase” includes the phase matrix, as a function of the scattering angle (variable “theta”). The 4×4 scattering phase matrix for spherical droplets has four non-zero elements, which are stored in the following order: $ P = \begin{pmatrix} P1 & P2 & 0 & 0 \\ P2 & P1 & 0 & 0 \\ 0 & 0 & P3 & P4 \\ 0 & 0 & -P4 & P3 \end{pmatrix} $
The corresponding Legendre polynomials (“pmom”) and the single scattering albedo (“ssa”) are also included in the file.
- output altitudes: 0 km, 1 km, 30 km
- sun position (sza=60°, saa=0°)
- viewing zenith angles:
- at 0 km : vza: 0° - 85°, 5° increment
- at 1 km: vza: 0° - 180°, 5° increment (without 90°)
- at 30 km: vza: 95° - 180°, 5° increment
- viewing azimuth angle vaa: 0° - 180°, 5° increment
Output format:
- The output should be provided in the same format as for case A1 (Rayleigh scattering).
Results
intercomparisons/b4_cloud_ocean.txt · Last modified: by 127.0.0.1