Subseasonal Reversal of Winter Temperature Over Northeast China in 2014/2015: Role of Arctic Sea Ice
This study investigates the temperature reversal over Northeast China (NEC) in winter 2014/2015, focusing on the variations of related general circulations and the affecting mechanisms of the Arctic sea ice on daily scale. It turns out to be the coupled impacts of the eastward propagations of tropos...
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Online Access: | http://dx.doi.org/10.3389/fenvs.2022.852673 https://www.frontiersin.org/articles/10.3389/fenvs.2022.852673/full |
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crfrontiers:10.3389/fenvs.2022.852673 2024-10-13T14:04:49+00:00 Subseasonal Reversal of Winter Temperature Over Northeast China in 2014/2015: Role of Arctic Sea Ice Dai, Haixia Fan, Ke 2022 http://dx.doi.org/10.3389/fenvs.2022.852673 https://www.frontiersin.org/articles/10.3389/fenvs.2022.852673/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Environmental Science volume 10 ISSN 2296-665X journal-article 2022 crfrontiers https://doi.org/10.3389/fenvs.2022.852673 2024-10-01T04:01:09Z This study investigates the temperature reversal over Northeast China (NEC) in winter 2014/2015, focusing on the variations of related general circulations and the affecting mechanisms of the Arctic sea ice on daily scale. It turns out to be the coupled impacts of the eastward propagations of tropospheric wave trains from the North Atlantic Ocean and the downward reflections of planetary wavenumber-1 from the stratosphere that resulted in the subseasonal reversal of winter temperature over NEC in winter 2014/2015. Also, such anomalous atmospheric circulations can be attributed to sea-ice anomalies over the Davis Strait–Baffin Bay (SIC-DSBB) and the Barents–Kara Sea (SIC-BKS) in November 2014. SIC-DSBB anomalies in November 2014 excited the eastward propagation of Rossby waves via the tripole pattern of sea surface temperature over the North Atlantic Sea, leading to the colder condition over NEC in the first and middle 10 days of December 2014. Anomalously heavy SIC-BKS also triggered wave trains from the polar region to Eurasia, strengthening the Rossby wave induced by SIC-DSBB. Moreover, the wave trains suppressed the upward propagation of planetary wavenumber-1 over the Siberia region, strengthening the stratospheric polar vortex. However, the sea-ice anomalies over these two domains only existed in November 2014. Thus, the tropospheric mechanisms by which the Arctic sea ice affected the temperature over NEC only lasted to late December 2014. Meanwhile, the stratospheric anomalies propagated downwards with the planetary wavenumber-1, favoring the positive phase of Arctic Oscillation in the troposphere and the warm condition over NEC since the last week of December 2014. Consequently, the temperature over NEC reversed in winter 2014/2015. Article in Journal/Newspaper Arctic Baffin Bay Baffin Bay Baffin Davis Strait Kara Sea North Atlantic Sea ice Siberia Frontiers (Publisher) Arctic Baffin Bay Kara Sea Frontiers in Environmental Science 10 |
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This study investigates the temperature reversal over Northeast China (NEC) in winter 2014/2015, focusing on the variations of related general circulations and the affecting mechanisms of the Arctic sea ice on daily scale. It turns out to be the coupled impacts of the eastward propagations of tropospheric wave trains from the North Atlantic Ocean and the downward reflections of planetary wavenumber-1 from the stratosphere that resulted in the subseasonal reversal of winter temperature over NEC in winter 2014/2015. Also, such anomalous atmospheric circulations can be attributed to sea-ice anomalies over the Davis Strait–Baffin Bay (SIC-DSBB) and the Barents–Kara Sea (SIC-BKS) in November 2014. SIC-DSBB anomalies in November 2014 excited the eastward propagation of Rossby waves via the tripole pattern of sea surface temperature over the North Atlantic Sea, leading to the colder condition over NEC in the first and middle 10 days of December 2014. Anomalously heavy SIC-BKS also triggered wave trains from the polar region to Eurasia, strengthening the Rossby wave induced by SIC-DSBB. Moreover, the wave trains suppressed the upward propagation of planetary wavenumber-1 over the Siberia region, strengthening the stratospheric polar vortex. However, the sea-ice anomalies over these two domains only existed in November 2014. Thus, the tropospheric mechanisms by which the Arctic sea ice affected the temperature over NEC only lasted to late December 2014. Meanwhile, the stratospheric anomalies propagated downwards with the planetary wavenumber-1, favoring the positive phase of Arctic Oscillation in the troposphere and the warm condition over NEC since the last week of December 2014. Consequently, the temperature over NEC reversed in winter 2014/2015. |
format |
Article in Journal/Newspaper |
author |
Dai, Haixia Fan, Ke |
spellingShingle |
Dai, Haixia Fan, Ke Subseasonal Reversal of Winter Temperature Over Northeast China in 2014/2015: Role of Arctic Sea Ice |
author_facet |
Dai, Haixia Fan, Ke |
author_sort |
Dai, Haixia |
title |
Subseasonal Reversal of Winter Temperature Over Northeast China in 2014/2015: Role of Arctic Sea Ice |
title_short |
Subseasonal Reversal of Winter Temperature Over Northeast China in 2014/2015: Role of Arctic Sea Ice |
title_full |
Subseasonal Reversal of Winter Temperature Over Northeast China in 2014/2015: Role of Arctic Sea Ice |
title_fullStr |
Subseasonal Reversal of Winter Temperature Over Northeast China in 2014/2015: Role of Arctic Sea Ice |
title_full_unstemmed |
Subseasonal Reversal of Winter Temperature Over Northeast China in 2014/2015: Role of Arctic Sea Ice |
title_sort |
subseasonal reversal of winter temperature over northeast china in 2014/2015: role of arctic sea ice |
publisher |
Frontiers Media SA |
publishDate |
2022 |
url |
http://dx.doi.org/10.3389/fenvs.2022.852673 https://www.frontiersin.org/articles/10.3389/fenvs.2022.852673/full |
geographic |
Arctic Baffin Bay Kara Sea |
geographic_facet |
Arctic Baffin Bay Kara Sea |
genre |
Arctic Baffin Bay Baffin Bay Baffin Davis Strait Kara Sea North Atlantic Sea ice Siberia |
genre_facet |
Arctic Baffin Bay Baffin Bay Baffin Davis Strait Kara Sea North Atlantic Sea ice Siberia |
op_source |
Frontiers in Environmental Science volume 10 ISSN 2296-665X |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/fenvs.2022.852673 |
container_title |
Frontiers in Environmental Science |
container_volume |
10 |
_version_ |
1812810480618569728 |