The dataset consist of camera shots of the sky. The camera - a total sky imager manufactured by Vivotek - was mounted at the top of the Research Vessel Polarstern. On the Atlantic transit from Bremerhaven to Cape Town in December 2021 this camera shots were taken with a temporal resolution of 15 seconds. The dataset represents the visible projection of weather conditions and cloud cover recorded on the vessel Polarstern in the direction near the zenith. These observations are useful for the interpretation of the atmospheric radiation measurements.
The dataset consists of continuous measurements of global, direct and diffuse spectral irradiance and aerosol optical thickness during Polarstern cruises PS83, PS95, PS98, PS102 and PS113 with the GUVis-3511 radiometer and the BioSHADE accessory build by Biospherical Instruments Inc.. To derive this dataset, the raw GUVis-3511 data is processed as described in Witthuhn et al. 2017, doi:10.5194/amt-10-709-2017 A first version of this data from cruise PS83 is already published at pangaea: doi:10.1594/PANGAEA.872377 Since then the processing algorithm receives major updates as described in Witthuhn et al. 2019 ( in review, doi:10.5194/amt-2019-321).
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