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A ground-based hyperspectral imaging spectrometer (AisaEAGLE, manufactured bySpecim Ltd., Finland) is applied to measure downward spectral radiance fieldswith high spatial (1024 spatial pixels within 36.7° field of view),spectral (488 spectral pixels, 400–970 nm, 1.25 nm full width at halfmaximum), and temporal (4–30 Hz) resolution. The calibration, measurementand data evaluation procedures are introduced. A new method is presented toretrieve the cirrus optical thickness (τci) using the spectralradiance data collected by AisaEAGLE. The data were collected during theCloud Aerosol Radiation and tuRbulence of trade wInd cumuli over BArbados(CARRIBA) project in 2011. The spatial inhomogeneity of the investigatedcirrus is characterised by the standard deviation of theretrieved τci as well as the width of its frequencydistribution. By comparing measured and simulated downward solar spectralradiance as a function of scattering angle, some evidence of the prevailingcirrus ice crystal shape can be obtained and subsequently used tosubstantiate the retrieval of τci. The sensitivity of theretrieval method with respect to surface albedo, effective radius(reff), cloud height and ice crystal shape is quantified. Anenhanced sensitivity of the retrieved τci is found with respectto the surface albedo (up to 30%) and ice crystal shape (up to90%). The sensitivity with regard to the effective ice crystal radius(≤ 5%) and the cloud height (≤ 0.5%) is rather small and canbe neglected

Retrieval of cirrus optical thickness and assessment of ice crystal shape from ground-based imaging spectrometry