Articles | Volume 22, issue 24
https://doi.org/10.5194/acp-22-15925-2022
https://doi.org/10.5194/acp-22-15925-2022
Research article
 | 
19 Dec 2022
Research article |  | 19 Dec 2022

Occurrence of polar stratospheric clouds as derived from ground-based zenith DOAS observations using the colour index

Bianca Lauster, Steffen Dörner, Carl-Fredrik Enell, Udo Frieß, Myojeong Gu, Janis Puķīte, Uwe Raffalski, and Thomas Wagner

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Short summary
Polar stratospheric clouds (PSCs) are an important component in ozone chemistry. Here, we use two differential optical absorption spectroscopy (DOAS) instruments in the Antarctic and Arctic to investigate the occurrence of PSCs based on the colour index, i.e. the colour of the zenith sky. Additionally using radiative transfer simulations, the variability and the seasonal cycle of PSC occurrence are analysed and an unexpectedly high signal during spring suggests the influence of volcanic aerosol.
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