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# Three-year observations of ozone columns over polar vortex edge area above West Antarctica

Fund Project:

National Natural Science Foundation of China

• The ozone vertical column densities (VCDs) were retrieved by Zenith Scattered Light-Differential Optical Absorption Spectroscopy (ZSL-DOAS) from January 2017 to February 2020 over Fildes Peninsula, West Antarctica (62.22S, 58.96W). The retrieved ozone VCDs started to decline around July with a comparable gradient (around 1.4 DU/day), then dropped to the lowest level in September and October, when the ozone holes appeared (less than 220 DU). The daily mean values of ozone columns were compared with OMI and GOME-2 satellite observations and MERRA-2 reanalysis dataset, with the correlation coefficients (R^2) of 0.86, 0.94 and 0.90 respectively. To better understand the causes of ozone depletion, the retrieved ozone columns, temperature and potential vorticity (PV) at certain altitude were analyzed. The profiles of ozone and PV showed positive correlation during the fluctuations, which indicates that polar vortex has great influence on stratospheric ozone depletion during Antarctic spring. Located at the edge of polar vortex, the observed data will provide a basis for further analysis and prediction of the inter-annual variation of stratospheric ozone in future.
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## Manuscript History

Manuscript revised: 29 December 2020
Manuscript accepted: 12 January 2021
###### 通讯作者: 陈斌, bchen63@163.com
• 1.

沈阳化工大学材料科学与工程学院 沈阳 110142

## Three-year observations of ozone columns over polar vortex edge area above West Antarctica

Abstract: The ozone vertical column densities (VCDs) were retrieved by Zenith Scattered Light-Differential Optical Absorption Spectroscopy (ZSL-DOAS) from January 2017 to February 2020 over Fildes Peninsula, West Antarctica (62.22S, 58.96W). The retrieved ozone VCDs started to decline around July with a comparable gradient (around 1.4 DU/day), then dropped to the lowest level in September and October, when the ozone holes appeared (less than 220 DU). The daily mean values of ozone columns were compared with OMI and GOME-2 satellite observations and MERRA-2 reanalysis dataset, with the correlation coefficients (R^2) of 0.86, 0.94 and 0.90 respectively. To better understand the causes of ozone depletion, the retrieved ozone columns, temperature and potential vorticity (PV) at certain altitude were analyzed. The profiles of ozone and PV showed positive correlation during the fluctuations, which indicates that polar vortex has great influence on stratospheric ozone depletion during Antarctic spring. Located at the edge of polar vortex, the observed data will provide a basis for further analysis and prediction of the inter-annual variation of stratospheric ozone in future.

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