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A method is developed for the calibration of the colour index (CI) and theO4 absorption derived from differential optical absorption spectroscopy(DOAS) measurements of scattered sunlight. The method is based on thecomparison of measurements and radiative transfer simulations forwell-defined atmospheric conditions and viewing geometries. Calibratedmeasurements of the CI and the O4 absorption are important for thedetection and classification of clouds from MAX-DOAS observations. Suchinformation is needed for the identification and correction of the cloudinfluence on Multi AXis (MAX-)DOAS profile inversion results, but might bealso be of interest on their own, e.g. for meteorological applications. Thecalibration algorithm was successfully applied to measurements at twolocations: Cabauw in the Netherlands and Wuxi in China. We used CI andO4 observations calibrated by the new method as input for our recently developed cloud classification scheme and also adapted the corresponding threshold values accordingly. For the observations at Cabauw, good agreement is found with the results of the original algorithm. Together with the calibration procedure of the CI and O4 absorption, the cloudclassification scheme, which has been tuned to specific locations/conditions sofar, can now be applied consistently to MAX-DOAS measurements at differentlocations. In addition to the new threshold values, further improvements wereintroduced to the cloud classification algorithm, namely a better descriptionof the SZA (solar zenith angle) dependence of the threshold values and a new set of wavelengths for the determination of the CI. We also indicate specific areas for future research to further improve the cloud classification scheme

atmospheric measurement techniques

Absolute calibration of the colour index and O&amp;lt;sub&amp;gt;4&amp;lt;/sub&amp;gt; absorption derived from Multi AXis (MAX-)DOAS measurements and their application to a standardised cloud classification algorithm