On the anomalous development of the extremely intense positive Arctic Oscillation of the 2019–2020 winter
Abstract Numerous extreme climate anomalies were recorded in the northern extratropics in January–March (JFM) 2020, significantly impacting human lives and ecosystems in the affected areas. Those anomalies were caused by an extreme positive Arctic Oscillation (AO) event, with the JFM 2020 AO index o...
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crioppubl:10.1088/1748-9326/abe434 2024-06-02T08:01:27+00:00 On the anomalous development of the extremely intense positive Arctic Oscillation of the 2019–2020 winter Juzbašić, A Kryjov, V N Ahn, J B Korea Meteorological Administration 2021 http://dx.doi.org/10.1088/1748-9326/abe434 https://iopscience.iop.org/article/10.1088/1748-9326/abe434 https://iopscience.iop.org/article/10.1088/1748-9326/abe434/pdf unknown IOP Publishing http://creativecommons.org/licenses/by/4.0 https://iopscience.iop.org/info/page/text-and-data-mining Environmental Research Letters volume 16, issue 5, page 055008 ISSN 1748-9326 journal-article 2021 crioppubl https://doi.org/10.1088/1748-9326/abe434 2024-05-07T14:03:12Z Abstract Numerous extreme climate anomalies were recorded in the northern extratropics in January–March (JFM) 2020, significantly impacting human lives and ecosystems in the affected areas. Those anomalies were caused by an extreme positive Arctic Oscillation (AO) event, with the JFM 2020 AO index of 2.8 being the highest on the record. However, all well-established autumn precursors pointed towards the following wintertime AO phase being negative. Indeed, a negative AO phase was developing until late December when a sudden shift to the strong positive AO event occurred in the troposphere. The geopotential anomalies associated with positive AO spread into the lower stratosphere, and were steadily enhancing throughout JFM resulting in an extreme positive AO event. We show that the strong positive AO event was a result of the destructive interference of the anomalous planetary waves with climatological ones, which led to wave flattening and enhancement of the polar vortex. Article in Journal/Newspaper Arctic IOP Publishing Arctic Environmental Research Letters 16 5 055008 |
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Abstract Numerous extreme climate anomalies were recorded in the northern extratropics in January–March (JFM) 2020, significantly impacting human lives and ecosystems in the affected areas. Those anomalies were caused by an extreme positive Arctic Oscillation (AO) event, with the JFM 2020 AO index of 2.8 being the highest on the record. However, all well-established autumn precursors pointed towards the following wintertime AO phase being negative. Indeed, a negative AO phase was developing until late December when a sudden shift to the strong positive AO event occurred in the troposphere. The geopotential anomalies associated with positive AO spread into the lower stratosphere, and were steadily enhancing throughout JFM resulting in an extreme positive AO event. We show that the strong positive AO event was a result of the destructive interference of the anomalous planetary waves with climatological ones, which led to wave flattening and enhancement of the polar vortex. |
author2 |
Korea Meteorological Administration |
format |
Article in Journal/Newspaper |
author |
Juzbašić, A Kryjov, V N Ahn, J B |
spellingShingle |
Juzbašić, A Kryjov, V N Ahn, J B On the anomalous development of the extremely intense positive Arctic Oscillation of the 2019–2020 winter |
author_facet |
Juzbašić, A Kryjov, V N Ahn, J B |
author_sort |
Juzbašić, A |
title |
On the anomalous development of the extremely intense positive Arctic Oscillation of the 2019–2020 winter |
title_short |
On the anomalous development of the extremely intense positive Arctic Oscillation of the 2019–2020 winter |
title_full |
On the anomalous development of the extremely intense positive Arctic Oscillation of the 2019–2020 winter |
title_fullStr |
On the anomalous development of the extremely intense positive Arctic Oscillation of the 2019–2020 winter |
title_full_unstemmed |
On the anomalous development of the extremely intense positive Arctic Oscillation of the 2019–2020 winter |
title_sort |
on the anomalous development of the extremely intense positive arctic oscillation of the 2019–2020 winter |
publisher |
IOP Publishing |
publishDate |
2021 |
url |
http://dx.doi.org/10.1088/1748-9326/abe434 https://iopscience.iop.org/article/10.1088/1748-9326/abe434 https://iopscience.iop.org/article/10.1088/1748-9326/abe434/pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Environmental Research Letters volume 16, issue 5, page 055008 ISSN 1748-9326 |
op_rights |
http://creativecommons.org/licenses/by/4.0 https://iopscience.iop.org/info/page/text-and-data-mining |
op_doi |
https://doi.org/10.1088/1748-9326/abe434 |
container_title |
Environmental Research Letters |
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16 |
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5 |
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055008 |
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1800745827252043776 |