Atmospheric Contributions to the Reversal of Surface Temperature Anomalies Between Early and Late Winter Over Eurasia
Abstract Observations have shown subseasonal reversal of temperature anomalies between early and late winter over Eurasia, which is distinct from the seasonal mean condition. Based on the reanalysis data, the 1800‐year control simulation and the 40‐member ensemble simulations in 1920–2100 from the C...
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ftdoajarticles:oai:doaj.org/article:c97e56182a954882841d2d14b69f5d63 2023-05-15T14:48:22+02:00 Atmospheric Contributions to the Reversal of Surface Temperature Anomalies Between Early and Late Winter Over Eurasia Xinping Xu Shengping He Botao Zhou Huijun Wang 2022-08-01T00:00:00Z https://doi.org/10.1029/2022EF002790 https://doaj.org/article/c97e56182a954882841d2d14b69f5d63 EN eng Wiley https://doi.org/10.1029/2022EF002790 https://doaj.org/toc/2328-4277 2328-4277 doi:10.1029/2022EF002790 https://doaj.org/article/c97e56182a954882841d2d14b69f5d63 Earth's Future, Vol 10, Iss 8, Pp n/a-n/a (2022) subseasonal reversal Arctic‐Eurasian linkage troposphere‐stratosphere dynamics Ural blocking large‐ensemble simulations Environmental sciences GE1-350 Ecology QH540-549.5 article 2022 ftdoajarticles https://doi.org/10.1029/2022EF002790 2022-12-30T22:14:37Z Abstract Observations have shown subseasonal reversal of temperature anomalies between early and late winter over Eurasia, which is distinct from the seasonal mean condition. Based on the reanalysis data, the 1800‐year control simulation and the 40‐member ensemble simulations in 1920–2100 from the Community Earth System Model (CESM) Large Ensemble (CESM‐LE), this study reveals that the reversal of surface air temperature (SAT) anomalies between early and late winter is one of the dominant and intrinsic features of the Arctic‐Eurasian winter climate. Such a reversal is characterized by “colder Arctic, warmer Eurasia” in December (January–February) and “warmer Arctic, colder Eurasia” in January–February (December). Robust climate dynamic processes associated with the reversal of SAT anomalies, including subseasonal reversals of anomalies in the Ural blocking, midlatitude westerlies, and stratospheric polar vortex, are found in both reanalysis data and CESM simulations, indicating the important role of internal atmospheric variability. Further analysis reveals that the reversal of Ural blocking anomalies in late December can be a potential precursor for the reversal of SAT anomalies in late winter. The reversal of midlatitude westerly wind anomalies associated with the Ural blocking can affect upward propagation of planetary‐scale waves especially with wavenumber 1, subsequently promoting the contribution of stratospheric polar vortex to the reversal of SAT anomalies in late winter over the Arctic‐Eurasian regions. Such a troposphere‐stratosphere pathway triggered by the perturbation of tropospheric circulations is confirmed by the CESM‐LE simulations, and it may be useful for the prediction of subseasonal reversal of SAT anomalies. Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic Earth's Future 10 8 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
subseasonal reversal Arctic‐Eurasian linkage troposphere‐stratosphere dynamics Ural blocking large‐ensemble simulations Environmental sciences GE1-350 Ecology QH540-549.5 |
spellingShingle |
subseasonal reversal Arctic‐Eurasian linkage troposphere‐stratosphere dynamics Ural blocking large‐ensemble simulations Environmental sciences GE1-350 Ecology QH540-549.5 Xinping Xu Shengping He Botao Zhou Huijun Wang Atmospheric Contributions to the Reversal of Surface Temperature Anomalies Between Early and Late Winter Over Eurasia |
topic_facet |
subseasonal reversal Arctic‐Eurasian linkage troposphere‐stratosphere dynamics Ural blocking large‐ensemble simulations Environmental sciences GE1-350 Ecology QH540-549.5 |
description |
Abstract Observations have shown subseasonal reversal of temperature anomalies between early and late winter over Eurasia, which is distinct from the seasonal mean condition. Based on the reanalysis data, the 1800‐year control simulation and the 40‐member ensemble simulations in 1920–2100 from the Community Earth System Model (CESM) Large Ensemble (CESM‐LE), this study reveals that the reversal of surface air temperature (SAT) anomalies between early and late winter is one of the dominant and intrinsic features of the Arctic‐Eurasian winter climate. Such a reversal is characterized by “colder Arctic, warmer Eurasia” in December (January–February) and “warmer Arctic, colder Eurasia” in January–February (December). Robust climate dynamic processes associated with the reversal of SAT anomalies, including subseasonal reversals of anomalies in the Ural blocking, midlatitude westerlies, and stratospheric polar vortex, are found in both reanalysis data and CESM simulations, indicating the important role of internal atmospheric variability. Further analysis reveals that the reversal of Ural blocking anomalies in late December can be a potential precursor for the reversal of SAT anomalies in late winter. The reversal of midlatitude westerly wind anomalies associated with the Ural blocking can affect upward propagation of planetary‐scale waves especially with wavenumber 1, subsequently promoting the contribution of stratospheric polar vortex to the reversal of SAT anomalies in late winter over the Arctic‐Eurasian regions. Such a troposphere‐stratosphere pathway triggered by the perturbation of tropospheric circulations is confirmed by the CESM‐LE simulations, and it may be useful for the prediction of subseasonal reversal of SAT anomalies. |
format |
Article in Journal/Newspaper |
author |
Xinping Xu Shengping He Botao Zhou Huijun Wang |
author_facet |
Xinping Xu Shengping He Botao Zhou Huijun Wang |
author_sort |
Xinping Xu |
title |
Atmospheric Contributions to the Reversal of Surface Temperature Anomalies Between Early and Late Winter Over Eurasia |
title_short |
Atmospheric Contributions to the Reversal of Surface Temperature Anomalies Between Early and Late Winter Over Eurasia |
title_full |
Atmospheric Contributions to the Reversal of Surface Temperature Anomalies Between Early and Late Winter Over Eurasia |
title_fullStr |
Atmospheric Contributions to the Reversal of Surface Temperature Anomalies Between Early and Late Winter Over Eurasia |
title_full_unstemmed |
Atmospheric Contributions to the Reversal of Surface Temperature Anomalies Between Early and Late Winter Over Eurasia |
title_sort |
atmospheric contributions to the reversal of surface temperature anomalies between early and late winter over eurasia |
publisher |
Wiley |
publishDate |
2022 |
url |
https://doi.org/10.1029/2022EF002790 https://doaj.org/article/c97e56182a954882841d2d14b69f5d63 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Earth's Future, Vol 10, Iss 8, Pp n/a-n/a (2022) |
op_relation |
https://doi.org/10.1029/2022EF002790 https://doaj.org/toc/2328-4277 2328-4277 doi:10.1029/2022EF002790 https://doaj.org/article/c97e56182a954882841d2d14b69f5d63 |
op_doi |
https://doi.org/10.1029/2022EF002790 |
container_title |
Earth's Future |
container_volume |
10 |
container_issue |
8 |
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1766319457836204032 |