Seasonal Cumulative Effect of Ural Blocking Episodes on the Frequent Cold events in China during the Early Winter of 2020/21
Abstract Starting in mid-November, China was hit by several cold events during the early winter of 2020/21. The lowest temperature observed at Beijing station on 7 January reached −19.6°C. In this paper, we show that the outbreak of the record-breaking extreme cold event can be attributed to a huge...
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crspringernat:10.1007/s00376-021-1100-4 2023-05-15T15:11:32+02:00 Seasonal Cumulative Effect of Ural Blocking Episodes on the Frequent Cold events in China during the Early Winter of 2020/21 Yao, Yao Zhang, Wenqi Luo, Dehai Zhong, Linhao Pei, Lin 2022 http://dx.doi.org/10.1007/s00376-021-1100-4 https://link.springer.com/content/pdf/10.1007/s00376-021-1100-4.pdf https://link.springer.com/article/10.1007/s00376-021-1100-4/fulltext.html en eng Springer Science and Business Media LLC https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Advances in Atmospheric Sciences ISSN 0256-1530 1861-9533 Atmospheric Science journal-article 2022 crspringernat https://doi.org/10.1007/s00376-021-1100-4 2022-01-14T15:43:00Z Abstract Starting in mid-November, China was hit by several cold events during the early winter of 2020/21. The lowest temperature observed at Beijing station on 7 January reached −19.6°C. In this paper, we show that the outbreak of the record-breaking extreme cold event can be attributed to a huge merging Ural blocking (UB) ridge over the Eurasian region. The sea-ice cover in the Kara and East Siberia Seas (KESS) in autumn was at its lowest value since 1979, which could have served as a precursor signal. Further analysis shows that several successive UB episodes occurred from 1 September 2020 to 10 January 2021. The persistent UB that occurred in late September/early October 2020 may have made an important contribution to the October historical minimum of sea ice in the KESS region. Our results also show that, after each UB episode in winter, significant upward propagation of wave activity occurred around 60°E, which resulted in weakening the stratospheric vortex. Meanwhile, each UB episode also caused a significant reduction in sea-ice extent in KESS and a significant weakening of the westerly jet in mid-high-latitude Eurasia. Results suggest that the Arctic vortex, which is supposed to enhance seasonally, became weaker and more unstable than the climatic mean under the seasonal cumulative effects of UB episodes, KESS warming, and long-lasting negative-phase North Atlantic Oscillation (NAO-). Those seasonal cumulative effects, combined with the impact of La Niña winter, led to the frequent occurrence of extreme cold events. Article in Journal/Newspaper Arctic North Atlantic North Atlantic oscillation Sea ice Siberia Springer Nature (via Crossref) Arctic Advances in Atmospheric Sciences |
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Springer Nature (via Crossref) |
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crspringernat |
language |
English |
topic |
Atmospheric Science |
spellingShingle |
Atmospheric Science Yao, Yao Zhang, Wenqi Luo, Dehai Zhong, Linhao Pei, Lin Seasonal Cumulative Effect of Ural Blocking Episodes on the Frequent Cold events in China during the Early Winter of 2020/21 |
topic_facet |
Atmospheric Science |
description |
Abstract Starting in mid-November, China was hit by several cold events during the early winter of 2020/21. The lowest temperature observed at Beijing station on 7 January reached −19.6°C. In this paper, we show that the outbreak of the record-breaking extreme cold event can be attributed to a huge merging Ural blocking (UB) ridge over the Eurasian region. The sea-ice cover in the Kara and East Siberia Seas (KESS) in autumn was at its lowest value since 1979, which could have served as a precursor signal. Further analysis shows that several successive UB episodes occurred from 1 September 2020 to 10 January 2021. The persistent UB that occurred in late September/early October 2020 may have made an important contribution to the October historical minimum of sea ice in the KESS region. Our results also show that, after each UB episode in winter, significant upward propagation of wave activity occurred around 60°E, which resulted in weakening the stratospheric vortex. Meanwhile, each UB episode also caused a significant reduction in sea-ice extent in KESS and a significant weakening of the westerly jet in mid-high-latitude Eurasia. Results suggest that the Arctic vortex, which is supposed to enhance seasonally, became weaker and more unstable than the climatic mean under the seasonal cumulative effects of UB episodes, KESS warming, and long-lasting negative-phase North Atlantic Oscillation (NAO-). Those seasonal cumulative effects, combined with the impact of La Niña winter, led to the frequent occurrence of extreme cold events. |
format |
Article in Journal/Newspaper |
author |
Yao, Yao Zhang, Wenqi Luo, Dehai Zhong, Linhao Pei, Lin |
author_facet |
Yao, Yao Zhang, Wenqi Luo, Dehai Zhong, Linhao Pei, Lin |
author_sort |
Yao, Yao |
title |
Seasonal Cumulative Effect of Ural Blocking Episodes on the Frequent Cold events in China during the Early Winter of 2020/21 |
title_short |
Seasonal Cumulative Effect of Ural Blocking Episodes on the Frequent Cold events in China during the Early Winter of 2020/21 |
title_full |
Seasonal Cumulative Effect of Ural Blocking Episodes on the Frequent Cold events in China during the Early Winter of 2020/21 |
title_fullStr |
Seasonal Cumulative Effect of Ural Blocking Episodes on the Frequent Cold events in China during the Early Winter of 2020/21 |
title_full_unstemmed |
Seasonal Cumulative Effect of Ural Blocking Episodes on the Frequent Cold events in China during the Early Winter of 2020/21 |
title_sort |
seasonal cumulative effect of ural blocking episodes on the frequent cold events in china during the early winter of 2020/21 |
publisher |
Springer Science and Business Media LLC |
publishDate |
2022 |
url |
http://dx.doi.org/10.1007/s00376-021-1100-4 https://link.springer.com/content/pdf/10.1007/s00376-021-1100-4.pdf https://link.springer.com/article/10.1007/s00376-021-1100-4/fulltext.html |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic North Atlantic North Atlantic oscillation Sea ice Siberia |
genre_facet |
Arctic North Atlantic North Atlantic oscillation Sea ice Siberia |
op_source |
Advances in Atmospheric Sciences ISSN 0256-1530 1861-9533 |
op_rights |
https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1007/s00376-021-1100-4 |
container_title |
Advances in Atmospheric Sciences |
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1766342371064152064 |