In:
Atmospheric Measurement Techniques, Copernicus GmbH, Vol. 14, No. 4 ( 2021-04-12), p. 2787-2798
Abstract:
Abstract. We propose a new cloud screening method for sun photometry that is designed to
effectively filter thin clouds. Our method is based on a k-nearest-neighbour
algorithm instead of scanning time series of aerosol optical depth. Using 10
years of data from a precision filter radiometer in Innsbruck, we compare our
new method and the currently employed screening technique. We exemplify the
performance of the two routines in different cloud conditions. While both
algorithms agree on the classification of a data point as clear or cloudy in a
majority of the cases, the new routine is found to be more effective in
flagging thin clouds. We conclude that this simple method can serve as a valid
alternative for cloud detection, and we discuss the generalizability to other
observation sites.
Type of Medium:
Online Resource
ISSN:
1867-8548
DOI:
10.5194/amt-14-2787-2021
Language:
English
Publisher:
Copernicus GmbH
Publication Date:
2021
detail.hit.zdb_id:
2505596-3
