The Joint Effect of Mid-latitude Winds and the Westerly Quasi-Biennial Oscillation Phase on the Antarctic Stratospheric Polar Vortex and Ozone
The quasi-biennial oscillation (QBO) dynamically interacts with the extratropical atmosphere. However, the relationship between the QBO in austral winter and the Antarctic stratospheric polar vortex in spring remains unclear. Here, we proposed a joint predictor involving the QBO for the Antarctic po...
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ftcopernicus:oai:publications.copernicus.org:egusphere122783 2024-09-30T14:26:46+00:00 The Joint Effect of Mid-latitude Winds and the Westerly Quasi-Biennial Oscillation Phase on the Antarctic Stratospheric Polar Vortex and Ozone Wang, Zhe Zhang, Jiankai Zhao, Siyi 2024-09-10 application/pdf https://doi.org/10.5194/egusphere-2024-2669 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-2669/ eng eng doi:10.5194/egusphere-2024-2669 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-2669/ eISSN: Text 2024 ftcopernicus https://doi.org/10.5194/egusphere-2024-2669 2024-09-10T23:57:28Z The quasi-biennial oscillation (QBO) dynamically interacts with the extratropical atmosphere. However, the relationship between the QBO in austral winter and the Antarctic stratospheric polar vortex in spring remains unclear. Here, we proposed a joint predictor involving the QBO for the Antarctic polar vortex and ozone in austral spring. During the westerly QBO phase (WQBO), positive anomalies in the zonal-mean zonal wind at 20° S−40° S in the upper stratosphere in July, named as the extratropical positive mode, can lead to a stronger Antarctic stratospheric polar vortex and lower ozone concentration in November, with correlations reaching 0.75 and 0.60. The mechanism is summarized as follows: the positive extratropical mode triggers a secondary circulation, which further alters the environmental condition for wave propagation in the stratosphere, pushing the positive anomalous zonal-mean zonal wind towards the pole. While during the easterly QBO phase (EQBO), the correlation of the extratropical mode and the strength of polar vortex is only 0.1. Due to stronger upward motions in the tropics, which opposes the secondary circulation caused by the extratropical mode, the EQBO cannot sustain the positive anomalous zonal-mean zonal wind until November. Our results highlight that the extratropical mode during WQBO could serve as a reliable predictor of the Antarctic stratospheric polar vortex and Antarctic ozone hole with a five-month time lag. Text Antarc* Antarctic Copernicus Publications: E-Journals Antarctic The Antarctic Austral |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
The quasi-biennial oscillation (QBO) dynamically interacts with the extratropical atmosphere. However, the relationship between the QBO in austral winter and the Antarctic stratospheric polar vortex in spring remains unclear. Here, we proposed a joint predictor involving the QBO for the Antarctic polar vortex and ozone in austral spring. During the westerly QBO phase (WQBO), positive anomalies in the zonal-mean zonal wind at 20° S−40° S in the upper stratosphere in July, named as the extratropical positive mode, can lead to a stronger Antarctic stratospheric polar vortex and lower ozone concentration in November, with correlations reaching 0.75 and 0.60. The mechanism is summarized as follows: the positive extratropical mode triggers a secondary circulation, which further alters the environmental condition for wave propagation in the stratosphere, pushing the positive anomalous zonal-mean zonal wind towards the pole. While during the easterly QBO phase (EQBO), the correlation of the extratropical mode and the strength of polar vortex is only 0.1. Due to stronger upward motions in the tropics, which opposes the secondary circulation caused by the extratropical mode, the EQBO cannot sustain the positive anomalous zonal-mean zonal wind until November. Our results highlight that the extratropical mode during WQBO could serve as a reliable predictor of the Antarctic stratospheric polar vortex and Antarctic ozone hole with a five-month time lag. |
format |
Text |
author |
Wang, Zhe Zhang, Jiankai Zhao, Siyi |
spellingShingle |
Wang, Zhe Zhang, Jiankai Zhao, Siyi The Joint Effect of Mid-latitude Winds and the Westerly Quasi-Biennial Oscillation Phase on the Antarctic Stratospheric Polar Vortex and Ozone |
author_facet |
Wang, Zhe Zhang, Jiankai Zhao, Siyi |
author_sort |
Wang, Zhe |
title |
The Joint Effect of Mid-latitude Winds and the Westerly Quasi-Biennial Oscillation Phase on the Antarctic Stratospheric Polar Vortex and Ozone |
title_short |
The Joint Effect of Mid-latitude Winds and the Westerly Quasi-Biennial Oscillation Phase on the Antarctic Stratospheric Polar Vortex and Ozone |
title_full |
The Joint Effect of Mid-latitude Winds and the Westerly Quasi-Biennial Oscillation Phase on the Antarctic Stratospheric Polar Vortex and Ozone |
title_fullStr |
The Joint Effect of Mid-latitude Winds and the Westerly Quasi-Biennial Oscillation Phase on the Antarctic Stratospheric Polar Vortex and Ozone |
title_full_unstemmed |
The Joint Effect of Mid-latitude Winds and the Westerly Quasi-Biennial Oscillation Phase on the Antarctic Stratospheric Polar Vortex and Ozone |
title_sort |
joint effect of mid-latitude winds and the westerly quasi-biennial oscillation phase on the antarctic stratospheric polar vortex and ozone |
publishDate |
2024 |
url |
https://doi.org/10.5194/egusphere-2024-2669 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-2669/ |
geographic |
Antarctic The Antarctic Austral |
geographic_facet |
Antarctic The Antarctic Austral |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
eISSN: |
op_relation |
doi:10.5194/egusphere-2024-2669 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-2669/ |
op_doi |
https://doi.org/10.5194/egusphere-2024-2669 |
_version_ |
1811632886186508288 |