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. Author manuscript; available in PMC: 2019 Feb 14.
Published in final edited form as: Photochem Photobiol Sci. 2018 Feb 14;17(2):127–179. doi: 10.1039/c7pp90043k

Fig. 2.

Fig. 2

Spectral dependence of effects of clouds on solar UV radiation in terms of the cloud modification factor (CMF, defined as the ratio of measured irradiance to calculated clear-sky irradiance). The figure shows the relationship between CMF in the UV-B and UV-B regions derived from many measurements at Mauna Loa Observatory, Hawaii. Events of attenuation by clouds correspond to CMF < 1 (lower left), while events of enhancement by clouds correspond to CMF > 1 (upper right). Updated from ref. 24.