Detection of a climatological short break in the polar night jet in early winter and its relation to cooling over Siberia
The polar night jet (PNJ) is a strong stratospheric westerly circumpolar wind at around 65∘ N in winter, and the strength of the climatological PNJ is widely recognized to increase from October through late December. Remarkably, the climatological PNJ temporarily stops increasing during late Novembe...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00041521 2023-05-15T18:02:12+02:00 Detection of a climatological short break in the polar night jet in early winter and its relation to cooling over Siberia Ando, Yuta Yamazaki, Koji Tachibana, Yoshihiro Ogi, Masayo Ukita, Jinro 2018-08 electronic https://doi.org/10.5194/acp-18-12639-2018 https://noa.gwlb.de/receive/cop_mods_00041521 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00041141/acp-18-12639-2018.pdf https://acp.copernicus.org/articles/18/12639/2018/acp-18-12639-2018.pdf eng eng Copernicus Publications Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-18-12639-2018 https://noa.gwlb.de/receive/cop_mods_00041521 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00041141/acp-18-12639-2018.pdf https://acp.copernicus.org/articles/18/12639/2018/acp-18-12639-2018.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2018 ftnonlinearchiv https://doi.org/10.5194/acp-18-12639-2018 2022-02-08T22:41:32Z The polar night jet (PNJ) is a strong stratospheric westerly circumpolar wind at around 65∘ N in winter, and the strength of the climatological PNJ is widely recognized to increase from October through late December. Remarkably, the climatological PNJ temporarily stops increasing during late November. We examined this “short break” in terms of the atmospheric dynamical balance and the climatological seasonal march. We found that it results from an increase in the upward propagation of climatological planetary waves from the troposphere to the stratosphere in late November, which coincides with a maximum of the climatological Eliassen–Palm (EP) flux convergence in the lower stratosphere. The upward propagation of planetary waves at 100 hPa, which is strongest over Siberia, is related to the climatological strengthening of the tropospheric trough over Siberia. We suggest that longitudinally asymmetric forcing by land–sea heating contrasts caused by their different heat capacities can account for the strengthening of the trough. Article in Journal/Newspaper polar night Siberia Niedersächsisches Online-Archiv NOA Atmospheric Chemistry and Physics 18 17 12639 12661 |
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article Verlagsveröffentlichung Ando, Yuta Yamazaki, Koji Tachibana, Yoshihiro Ogi, Masayo Ukita, Jinro Detection of a climatological short break in the polar night jet in early winter and its relation to cooling over Siberia |
topic_facet |
article Verlagsveröffentlichung |
description |
The polar night jet (PNJ) is a strong stratospheric westerly circumpolar wind at around 65∘ N in winter, and the strength of the climatological PNJ is widely recognized to increase from October through late December. Remarkably, the climatological PNJ temporarily stops increasing during late November. We examined this “short break” in terms of the atmospheric dynamical balance and the climatological seasonal march. We found that it results from an increase in the upward propagation of climatological planetary waves from the troposphere to the stratosphere in late November, which coincides with a maximum of the climatological Eliassen–Palm (EP) flux convergence in the lower stratosphere. The upward propagation of planetary waves at 100 hPa, which is strongest over Siberia, is related to the climatological strengthening of the tropospheric trough over Siberia. We suggest that longitudinally asymmetric forcing by land–sea heating contrasts caused by their different heat capacities can account for the strengthening of the trough. |
format |
Article in Journal/Newspaper |
author |
Ando, Yuta Yamazaki, Koji Tachibana, Yoshihiro Ogi, Masayo Ukita, Jinro |
author_facet |
Ando, Yuta Yamazaki, Koji Tachibana, Yoshihiro Ogi, Masayo Ukita, Jinro |
author_sort |
Ando, Yuta |
title |
Detection of a climatological short break in the polar night jet in early winter and its relation to cooling over Siberia |
title_short |
Detection of a climatological short break in the polar night jet in early winter and its relation to cooling over Siberia |
title_full |
Detection of a climatological short break in the polar night jet in early winter and its relation to cooling over Siberia |
title_fullStr |
Detection of a climatological short break in the polar night jet in early winter and its relation to cooling over Siberia |
title_full_unstemmed |
Detection of a climatological short break in the polar night jet in early winter and its relation to cooling over Siberia |
title_sort |
detection of a climatological short break in the polar night jet in early winter and its relation to cooling over siberia |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/acp-18-12639-2018 https://noa.gwlb.de/receive/cop_mods_00041521 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00041141/acp-18-12639-2018.pdf https://acp.copernicus.org/articles/18/12639/2018/acp-18-12639-2018.pdf |
genre |
polar night Siberia |
genre_facet |
polar night Siberia |
op_relation |
Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-18-12639-2018 https://noa.gwlb.de/receive/cop_mods_00041521 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00041141/acp-18-12639-2018.pdf https://acp.copernicus.org/articles/18/12639/2018/acp-18-12639-2018.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/acp-18-12639-2018 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
18 |
container_issue |
17 |
container_start_page |
12639 |
op_container_end_page |
12661 |
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1766171995572011008 |