Occurrence of polar stratospheric clouds as derived from ground-based zenith DOAS observations using the colour index
Polar stratospheric clouds (PSCs) are an important component of ozone chemistry in polar regions. Studying the ozone-depleting processes requires a precise description of PSCs on a long-term basis. Although satellite observations already yield high spatial coverage, continuous ground-based measureme...
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| Main Authors: | , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
19 December 2022
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| In: |
Atmospheric chemistry and physics
Year: 2022, Volume: 22, Issue: 24, Pages: 15925-15942 |
| ISSN: | 1680-7324 |
| DOI: | 10.5194/acp-22-15925-2022 |
| Online Access: | Resolving-System, lizenzpflichtig, Volltext: https://doi.org/10.5194/acp-22-15925-2022 Verlag, lizenzpflichtig, Volltext: https://acp.copernicus.org/articles/22/15925/2022/ 
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| Author Notes: | Bianca Lauster, Steffen Dörner, Carl-Fredrik Enell, Udo Frieß, Myojeong Gu, Janis Puķīte, Uwe Raffalski, and Thomas Wagner |
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| 520 | |a Polar stratospheric clouds (PSCs) are an important component of ozone chemistry in polar regions. Studying the ozone-depleting processes requires a precise description of PSCs on a long-term basis. Although satellite observations already yield high spatial coverage, continuous ground-based measurements covering long time periods can be a valuable complement. In this study, differential optical absorption spectroscopy (DOAS) instruments are used to investigate the occurrence of PSCs based on the so-called colour index (CI), i.e. the colour of the zenith sky. Defined as the ratio between the observed intensities of scattered sunlight at two wavelengths, it provides a method to detect PSCs during twilight even in the presence of tropospheric clouds. We present data from instruments at the German research station Neumayer, Antarctica (71∘ S, 8∘ W), as well as Kiruna, Sweden (68∘ N, 20∘ E), which have been in operation for more than 20 years. | ||
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