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  Total ozone variability and trends over the South Pole during the wintertime

Fioletov, V., Zhao, X., Abboud, I., Brohart, M., Ogyu, A., Sit, R., Lee, S. C., Petropavlovskikh, I., Johnson, B., Cullis, P., Booth, J., McConville, G. (2023): Total ozone variability and trends over the South Pole during the wintertime, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1029

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018230 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018230_1
Genre: Conference Paper

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 Creators:
Fioletov, Vitali1, Author
Zhao, Xiaoyi1, Author
Abboud, Ihab1, Author
Brohart, Michael1, Author
Ogyu, Akira1, Author
Sit, Reno1, Author
Lee, Sum Chi1, Author
Petropavlovskikh, Irina1, Author
Johnson, Bryan1, Author
Cullis, Patrick1, Author
Booth, John1, Author
McConville, Glen1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: The Antarctic polar vortex creates unique chemical and dynamic conditions when the stratospheric air over Antarctica is isolated from the rest of the stratosphere. As a result, stratospheric ozone within the vortex remains largely unchanged for a five-month period from April until late August when the sunrise and extremely cold temperatures create favorable conditions for rapid ozone loss. Such prolong stable conditions within the vortex make it possible to estimate the ozone levels there from sparse wintertime ozone observations at the South Pole. Total ozone measurements by Dobson and Brewer spectrophotometers that use the Moon as the light source, integrated ozonesonde profiles, and MERRA-2 reanalysis data were used to analyse ozone variability and trends over the South Pole. The wintertime ozone values over the South Pole during the last 20 years were 12%–15% below the pre-1980 level, i.e., the decline there was nearly twice larger than that over southern midlatitudes. It is probably the largest long-term ozone decline aside from the springtime Antarctic ozone depletion. While wintertime ozone decline over the pole hardly has any impact on the environment, it can be used as an indicator to diagnose the state of the ozone layer, particularly because it requires data only from one station. Data after 2004 show a small positive trend, although it is not statistically significant. Total ozone variability over the South Pole and observation uncertainties will be also discussed.

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Language(s): eng - English
 Dates: 2023
 Publication Status: Finally published
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 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-1029
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: -