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intercomparisons:d1_rayleigh
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intercomparisons:d1_rayleigh [2025/07/21 10:39] claudia |
intercomparisons:d1_rayleigh [2025/07/21 22:16] (current) |
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| The most simple setup contains only one layer with scattering (non-absorbing) molecules. Radiance shall be calculated for various sun-observer geometries, for twilight conditions and for limb observation geometries. We use the same model setup as for case B1, only change from plane-parallel to spherical geometry. | The most simple setup contains only one layer with scattering (non-absorbing) molecules. Radiance shall be calculated for various sun-observer geometries, for twilight conditions and for limb observation geometries. We use the same model setup as for case B1, only change from plane-parallel to spherical geometry. | ||
| - | {{:intercomparisons:phase_d:spherical_system.png?400|Figure from Gao et al. 2023, https://doi.org/10.5194/amt-16-5863-2023}} | ||
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| - | General definition of angles for all simulations in spherical geometry: We refer to the angles at the position of the observer, i.e. at the top of the atmosphere VZA=θ<sub>v</sub>' and SZA=θ<sub>0</sub>'. For the observer at the surface VZA=θ<sub>v</sub> and SZA=θ<sub>0</sub>. The azimuth angles also refer to the position of the observer. The figure is taken from [[https://doi.org/10.5194/amt-16-5863-2023|Gao et al. 2023]]. | ||
| //Setup:// | //Setup:// | ||
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| * no molecular absorption | * no molecular absorption | ||
| * Earth radius: 6371 km | * Earth radius: 6371 km | ||
| - | * Thickness of layer: 100 km | + | * Thickness of layer: 120 km |
| - | * D1_1: Twilight radiance field (normalized to incident irradiance) at the bottom of the layer: | + | * Sun-observer geometries as defined in general settings: |
| - | * sun position: //sza//:92°, //saa//:65° | + | * //viewing zenith angles// (deg): [0, 9, 18, 26, 34, 41, 48, 54, 60, 65, 70, 74, 78, 81, 84, 86, 88, 89, 90] (up-looking at bottom of atmosphere, down-looking at top of atmosphere] |
| - | * viewing zenith angles: //vza//: 0° - 90°, 5° increment (up-looking) | + | * //viewing azimuth angles// (deg): 0-180, 10° increment |
| - | * viewing azimuth angles: //vaa//: 0° - 360°, 5° increment | + | * //solar zenith angles// (deg): [30, 60, 80, 87, 90, 93, 96, 99] |
| + | * //solar azimuth angle// (deg): 0 | ||
| + | * //sensor altitude// (km): 0, 120 | ||
| - | *D1_2: Limb radiance at top of atmosphere for 20 km tangent height | + | |
| - | * viewing zenith angle at TOA: //vza//: 81.9° | + | |
| - | * viewing azimuth angle at TOA: //vaa//: 30° | + | |
| - | * solar zenith angles: //sza//: 0° - 90°, 5° increment | + | |
| - | * solar azimuth angles: //saa//: 0° - 360°, 5° increment | + | |
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| - | //Output format:// | ||
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| - | Please include your data in the netcdf file {{:intercomparisons:phase_d:iprt_phase3_model.nc|IPRT_phase3_MODELNAME.nc}}. | ||
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intercomparisons/d1_rayleigh.txt · Last modified: 2025/07/21 22:16 (external edit)
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