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--- intercomparisons:e5_cirrus [2025/07/21 23:18] – external edit 127.0.0.1
+++ intercomparisons:e5_cirrus [2025/09/10 19:03] (current) – claudia
@@ Line 1: / Line 1: @@
+==== Case E5: US standard atmosphere and cirrus cloud ====
+In this case we include the US standard atmosphere, the corresponding Rayleigh scattering optical thickness and molecular absorption profiles are provided at 450 nm.
+In addition we include a cirrus cloud layer.
+//Setup://
+  * model atmosphere US-standard, scattering optical thickness provided in file {{:intercomparisons:phase_e:tau_rayleigh_450nm_usstd.dat|}}, molecular absorption optical thicknes in {{:intercomparisons:phase_e:tau_absorption_450nm_usstd.dat|}}. The file includes 2 columns where the first is the altitude of the layer boundaries in km, and the second is the layer optical thickness (e.g. the value for 0 km corresponds to the optical thickness for the layer from 0 to 1 km).
+  * cirrus cloud layer between 10 and 11 km altitdue with an optical thickness of 1.0. The aecirrus optical properties are given in the file {{:intercomparisons:phase_e:ic.ghm.baum.cdf}}. The format of the file is the same as in case D4.
+  * Effective radius of cirrus particles: 50 µm
+  * wavelength: 450 nm
+  * Rayleigh depolarization factor: 0.03
+  * surface albedo: 0
+  * Earth radius: 6371 km
+  * Sun-observer geometries as defined in general settings:
+      * //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 azimuth angles// (deg): 0-180, 10° increment
+      * //solar zenith angles// (deg): [30, 60, 80, 87, 90, 93, 96, 99]
+      * //solar azimuth angle// (deg): 0
+      * //sensor altitude// (km): 0, 120