Subseasonal swing of cold and warm extremes between Eurasia and North America in winter of 2020/21: initiation and physical process
Abstract Eurasia and North America experienced a robust subseasonal swing of surface air temperature (SAT) extremes in 2020/21 winter, featuring severe cold (warm) extremes over Eurasia before (after) 15 January and conversely over North America. This sharp subseasonal swing of intercontinental cold...
Published in: | Environmental Research Letters |
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Online Access: | http://dx.doi.org/10.1088/1748-9326/acaabf https://iopscience.iop.org/article/10.1088/1748-9326/acaabf https://iopscience.iop.org/article/10.1088/1748-9326/acaabf/pdf |
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crioppubl:10.1088/1748-9326/acaabf 2024-06-23T07:55:40+00:00 Subseasonal swing of cold and warm extremes between Eurasia and North America in winter of 2020/21: initiation and physical process Ma, Shuangmei Zhu, Congwen CAMS National Natural Science Foundation of China 2023 http://dx.doi.org/10.1088/1748-9326/acaabf https://iopscience.iop.org/article/10.1088/1748-9326/acaabf https://iopscience.iop.org/article/10.1088/1748-9326/acaabf/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 18, issue 1, page 014023 ISSN 1748-9326 journal-article 2023 crioppubl https://doi.org/10.1088/1748-9326/acaabf 2024-05-27T13:03:29Z Abstract Eurasia and North America experienced a robust subseasonal swing of surface air temperature (SAT) extremes in 2020/21 winter, featuring severe cold (warm) extremes over Eurasia before (after) 15 January and conversely over North America. This sharp subseasonal swing of intercontinental cold and warm extremes exerted considerable severe impacts on human activities and the global economy. Here we examined the initiation and physical process based on data analyses. Our results show annual cycle (AC) anomalies of SAT caused this subseasonal alternating of temperature extremes in two regions. The AC anomalies of SAT are regulated by the phase transition of the North-Pacific-Oscillation-like (NPO-like) circumglobal Rossby wave (CRW) train. Unprecedented warming sea surface temperature over midlatitude Northwest Atlantic in early winter initiated a positive phase of the NPO-like CRW train, via eddy-mediated physical processes and the resultant feedback of sea ice loss over the Barents-Kara Seas. While, the subsequent downward feedback of stratospheric processes resulted in the negative phase of the NPO-like CRW pattern in late winter. This work advances the understanding of the subseasonal predictability of SAT extremes from impacts of AC anomalies and intercontinental seesawing. Article in Journal/Newspaper Northwest Atlantic Sea ice IOP Publishing Pacific Environmental Research Letters |
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Abstract Eurasia and North America experienced a robust subseasonal swing of surface air temperature (SAT) extremes in 2020/21 winter, featuring severe cold (warm) extremes over Eurasia before (after) 15 January and conversely over North America. This sharp subseasonal swing of intercontinental cold and warm extremes exerted considerable severe impacts on human activities and the global economy. Here we examined the initiation and physical process based on data analyses. Our results show annual cycle (AC) anomalies of SAT caused this subseasonal alternating of temperature extremes in two regions. The AC anomalies of SAT are regulated by the phase transition of the North-Pacific-Oscillation-like (NPO-like) circumglobal Rossby wave (CRW) train. Unprecedented warming sea surface temperature over midlatitude Northwest Atlantic in early winter initiated a positive phase of the NPO-like CRW train, via eddy-mediated physical processes and the resultant feedback of sea ice loss over the Barents-Kara Seas. While, the subsequent downward feedback of stratospheric processes resulted in the negative phase of the NPO-like CRW pattern in late winter. This work advances the understanding of the subseasonal predictability of SAT extremes from impacts of AC anomalies and intercontinental seesawing. |
author2 |
CAMS National Natural Science Foundation of China |
format |
Article in Journal/Newspaper |
author |
Ma, Shuangmei Zhu, Congwen |
spellingShingle |
Ma, Shuangmei Zhu, Congwen Subseasonal swing of cold and warm extremes between Eurasia and North America in winter of 2020/21: initiation and physical process |
author_facet |
Ma, Shuangmei Zhu, Congwen |
author_sort |
Ma, Shuangmei |
title |
Subseasonal swing of cold and warm extremes between Eurasia and North America in winter of 2020/21: initiation and physical process |
title_short |
Subseasonal swing of cold and warm extremes between Eurasia and North America in winter of 2020/21: initiation and physical process |
title_full |
Subseasonal swing of cold and warm extremes between Eurasia and North America in winter of 2020/21: initiation and physical process |
title_fullStr |
Subseasonal swing of cold and warm extremes between Eurasia and North America in winter of 2020/21: initiation and physical process |
title_full_unstemmed |
Subseasonal swing of cold and warm extremes between Eurasia and North America in winter of 2020/21: initiation and physical process |
title_sort |
subseasonal swing of cold and warm extremes between eurasia and north america in winter of 2020/21: initiation and physical process |
publisher |
IOP Publishing |
publishDate |
2023 |
url |
http://dx.doi.org/10.1088/1748-9326/acaabf https://iopscience.iop.org/article/10.1088/1748-9326/acaabf https://iopscience.iop.org/article/10.1088/1748-9326/acaabf/pdf |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Northwest Atlantic Sea ice |
genre_facet |
Northwest Atlantic Sea ice |
op_source |
Environmental Research Letters volume 18, issue 1, page 014023 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/acaabf |
container_title |
Environmental Research Letters |
_version_ |
1802648342555000832 |