Convective modes reveal the incoherence of the Southern Polar Vortex
The Southern Polar Vortex (SPV) is prominent over Antarctica in the Austral winter, and typically associated with a region of low temperature, low ozone concentration, negative potential vorticity, and polar stratospheric clouds. Seasonal and unexpected changes in the SPV have a profound influence o...
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ftpubmed:oai:pubmedcentral.nih.gov:10782018 2024-02-11T09:58:48+01:00 Convective modes reveal the incoherence of the Southern Polar Vortex Blachut, Chantelle Balasuriya, Sanjeeva 2024-01-10 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10782018/ http://www.ncbi.nlm.nih.gov/pubmed/38200097 https://doi.org/10.1038/s41598-023-50411-x en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10782018/ http://www.ncbi.nlm.nih.gov/pubmed/38200097 http://dx.doi.org/10.1038/s41598-023-50411-x © The Author(s) 2024 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . Sci Rep Article Text 2024 ftpubmed https://doi.org/10.1038/s41598-023-50411-x 2024-01-14T02:14:34Z The Southern Polar Vortex (SPV) is prominent over Antarctica in the Austral winter, and typically associated with a region of low temperature, low ozone concentration, negative potential vorticity, and polar stratospheric clouds. Seasonal and unexpected changes in the SPV have a profound influence on global weather. A methodology which identifies the SPV’s coherence and breakup using only wind and pressure data is developed and validated against temperature, ozone and potential vorticity data. The process identifies “convective modes”, each with an assigned “coherence” value, which form building blocks for the observed spatial variation of the SPV. Analysis and interpretation are presented for 4 years with quite different known behavior of the SPV: 1999 (a relatively standard year), 2002 (when the SPV split into two), 2019 (an atmospheric warming year which led to an early dissipation in the SPV), and the most recent year 2022 (which was influenced by submarine volcano eruptions and a prolonged La Niña event). In decomposing convective effects into modes with quantifiable coherence, this study solidifies connections between wind velocities and atmospheric variables while providing new tools to study the evolution of coherent structures and signal the occurrence of atypical geophysical events. Text Antarc* Antarctica PubMed Central (PMC) Austral Scientific Reports 14 1 |
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Article Blachut, Chantelle Balasuriya, Sanjeeva Convective modes reveal the incoherence of the Southern Polar Vortex |
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The Southern Polar Vortex (SPV) is prominent over Antarctica in the Austral winter, and typically associated with a region of low temperature, low ozone concentration, negative potential vorticity, and polar stratospheric clouds. Seasonal and unexpected changes in the SPV have a profound influence on global weather. A methodology which identifies the SPV’s coherence and breakup using only wind and pressure data is developed and validated against temperature, ozone and potential vorticity data. The process identifies “convective modes”, each with an assigned “coherence” value, which form building blocks for the observed spatial variation of the SPV. Analysis and interpretation are presented for 4 years with quite different known behavior of the SPV: 1999 (a relatively standard year), 2002 (when the SPV split into two), 2019 (an atmospheric warming year which led to an early dissipation in the SPV), and the most recent year 2022 (which was influenced by submarine volcano eruptions and a prolonged La Niña event). In decomposing convective effects into modes with quantifiable coherence, this study solidifies connections between wind velocities and atmospheric variables while providing new tools to study the evolution of coherent structures and signal the occurrence of atypical geophysical events. |
format |
Text |
author |
Blachut, Chantelle Balasuriya, Sanjeeva |
author_facet |
Blachut, Chantelle Balasuriya, Sanjeeva |
author_sort |
Blachut, Chantelle |
title |
Convective modes reveal the incoherence of the Southern Polar Vortex |
title_short |
Convective modes reveal the incoherence of the Southern Polar Vortex |
title_full |
Convective modes reveal the incoherence of the Southern Polar Vortex |
title_fullStr |
Convective modes reveal the incoherence of the Southern Polar Vortex |
title_full_unstemmed |
Convective modes reveal the incoherence of the Southern Polar Vortex |
title_sort |
convective modes reveal the incoherence of the southern polar vortex |
publisher |
Nature Publishing Group UK |
publishDate |
2024 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10782018/ http://www.ncbi.nlm.nih.gov/pubmed/38200097 https://doi.org/10.1038/s41598-023-50411-x |
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Austral |
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Antarc* Antarctica |
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Antarc* Antarctica |
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Sci Rep |
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10782018/ http://www.ncbi.nlm.nih.gov/pubmed/38200097 http://dx.doi.org/10.1038/s41598-023-50411-x |
op_rights |
© The Author(s) 2024 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
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https://doi.org/10.1038/s41598-023-50411-x |
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Scientific Reports |
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14 |
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