TY - JOUR A1 - Lauster, B. A1 - Dörner, S. A1 - Enell, C.-F. A1 - Frieß, U. A1 - Gu, M. A1 - Pukīte, J. A1 - Raffalski, U. A1 - Wagner, T. T1 - Occurrence of Polar Stratospheric Clouds as derived from Ground-based Zenith DOAS Observations using the Colour Index JO - Atmos. Chem. Phys. Discuss. J1 - ACPD VL - 2022 SP - 1 EP - 37 Y1 - 2022/09/23 PB - Copernicus Publications SN - 1680-7375 UR - https://acp.copernicus.org/preprints/acp-2022-647/ L1 - https://acp.copernicus.org/preprints/acp-2022-647/acp-2022-647.pdf DO - 10.5194/acp-2022-647 ER -