Phase-shift mode of the East Asian trough from December to February: Characteristic and possible mechanisms
The East Asian trough (EAT) is an important member of the East Asian winter monsoon system, profoundly influencing the local climate in winter. In this study, we report the phase-shift mode of the monthly EAT variations from December to February based on the extended empirical orthogonal function (E...
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ftdoajarticles:oai:doaj.org/article:1b282fb2228542e19e70d06f0c422571 2023-05-15T15:10:41+02:00 Phase-shift mode of the East Asian trough from December to February: Characteristic and possible mechanisms Shui Yu Mengqi Zhang Xingxing Li 2022-09-01T00:00:00Z https://doi.org/10.3389/feart.2022.1014011 https://doaj.org/article/1b282fb2228542e19e70d06f0c422571 EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/feart.2022.1014011/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2022.1014011 https://doaj.org/article/1b282fb2228542e19e70d06f0c422571 Frontiers in Earth Science, Vol 10 (2022) east asian trough north atlantic oscillation barents-kara sea ice extended empirical orthogonal function month-to-month variation Science Q article 2022 ftdoajarticles https://doi.org/10.3389/feart.2022.1014011 2022-12-30T21:50:43Z The East Asian trough (EAT) is an important member of the East Asian winter monsoon system, profoundly influencing the local climate in winter. In this study, we report the phase-shift mode of the monthly EAT variations from December to February based on the extended empirical orthogonal function (EEOF) method. Associated with the phase-shift mode are the noticeable opposite air temperature anomalies over East Asia between December and February, consistent with the recently reported warm early winter and cold late winter (or vice versa). Possible mechanism analysis indicates that the EAT phase-shift mode is closely linked with the anomalous North Atlantic Oscillation (NAO). By exciting a zonal Rossby wave train in December, an anomalous NAO could lead to significantly simultaneous changes in the EAT. However, in January, the NAO-excited Rossby wave train could hardly reach East Asia and has a weak influence on the EAT. In contrast, anomalous NAO in January can significantly influence Arctic Sea ice, causing significant sea ice anomalies over the Barents-Kara (BK) Sea. The BK Sea ice anomalies can persist to the following February, which further excites a Rossby wave train propagating to East Asia, leading to the opposite anomalous EAT in February relative to that in December. Therefore, through the exciting Rossby wave train in December and its resultant BK Sea ice anomalies in February, the NAO contributes to the phase shift of the anomalous EAT from December to February. Article in Journal/Newspaper Arctic Kara Sea North Atlantic North Atlantic oscillation Sea ice Directory of Open Access Journals: DOAJ Articles Arctic Kara Sea Frontiers in Earth Science 10 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
east asian trough north atlantic oscillation barents-kara sea ice extended empirical orthogonal function month-to-month variation Science Q |
spellingShingle |
east asian trough north atlantic oscillation barents-kara sea ice extended empirical orthogonal function month-to-month variation Science Q Shui Yu Mengqi Zhang Xingxing Li Phase-shift mode of the East Asian trough from December to February: Characteristic and possible mechanisms |
topic_facet |
east asian trough north atlantic oscillation barents-kara sea ice extended empirical orthogonal function month-to-month variation Science Q |
description |
The East Asian trough (EAT) is an important member of the East Asian winter monsoon system, profoundly influencing the local climate in winter. In this study, we report the phase-shift mode of the monthly EAT variations from December to February based on the extended empirical orthogonal function (EEOF) method. Associated with the phase-shift mode are the noticeable opposite air temperature anomalies over East Asia between December and February, consistent with the recently reported warm early winter and cold late winter (or vice versa). Possible mechanism analysis indicates that the EAT phase-shift mode is closely linked with the anomalous North Atlantic Oscillation (NAO). By exciting a zonal Rossby wave train in December, an anomalous NAO could lead to significantly simultaneous changes in the EAT. However, in January, the NAO-excited Rossby wave train could hardly reach East Asia and has a weak influence on the EAT. In contrast, anomalous NAO in January can significantly influence Arctic Sea ice, causing significant sea ice anomalies over the Barents-Kara (BK) Sea. The BK Sea ice anomalies can persist to the following February, which further excites a Rossby wave train propagating to East Asia, leading to the opposite anomalous EAT in February relative to that in December. Therefore, through the exciting Rossby wave train in December and its resultant BK Sea ice anomalies in February, the NAO contributes to the phase shift of the anomalous EAT from December to February. |
format |
Article in Journal/Newspaper |
author |
Shui Yu Mengqi Zhang Xingxing Li |
author_facet |
Shui Yu Mengqi Zhang Xingxing Li |
author_sort |
Shui Yu |
title |
Phase-shift mode of the East Asian trough from December to February: Characteristic and possible mechanisms |
title_short |
Phase-shift mode of the East Asian trough from December to February: Characteristic and possible mechanisms |
title_full |
Phase-shift mode of the East Asian trough from December to February: Characteristic and possible mechanisms |
title_fullStr |
Phase-shift mode of the East Asian trough from December to February: Characteristic and possible mechanisms |
title_full_unstemmed |
Phase-shift mode of the East Asian trough from December to February: Characteristic and possible mechanisms |
title_sort |
phase-shift mode of the east asian trough from december to february: characteristic and possible mechanisms |
publisher |
Frontiers Media S.A. |
publishDate |
2022 |
url |
https://doi.org/10.3389/feart.2022.1014011 https://doaj.org/article/1b282fb2228542e19e70d06f0c422571 |
geographic |
Arctic Kara Sea |
geographic_facet |
Arctic Kara Sea |
genre |
Arctic Kara Sea North Atlantic North Atlantic oscillation Sea ice |
genre_facet |
Arctic Kara Sea North Atlantic North Atlantic oscillation Sea ice |
op_source |
Frontiers in Earth Science, Vol 10 (2022) |
op_relation |
https://www.frontiersin.org/articles/10.3389/feart.2022.1014011/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2022.1014011 https://doaj.org/article/1b282fb2228542e19e70d06f0c422571 |
op_doi |
https://doi.org/10.3389/feart.2022.1014011 |
container_title |
Frontiers in Earth Science |
container_volume |
10 |
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1766341662774132736 |