Enhanced stratosphere/troposphere coupling during extreme warm stratospheric events with strong polar-night jet oscillation
Extreme warm stratospheric events during polar winters from ERA-Interim reanalysis and CMIP5-ESM-LR runs were separated by duration and strength of the polar-night jet oscillation (PJO) using a high statistical confidence level of three standard deviations (strong-PJO events). With a composite analy...
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Online Access: | https://doi.org/10.34657/4633 https://oa.tib.eu/renate/handle/123456789/6004 |
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ftleibnizopen:oai:oai.leibnizopen.de:y_0pF4cBdbrxVwz6F0iC 2023-05-15T15:01:00+02:00 Enhanced stratosphere/troposphere coupling during extreme warm stratospheric events with strong polar-night jet oscillation Peters, D.H.W. Schneidereit, A. Karpechko, A.Y. 2018 application/pdf https://doi.org/10.34657/4633 https://oa.tib.eu/renate/handle/123456789/6004 eng eng Basel : MDPI AG CC BY 4.0 Unported https://creativecommons.org/licenses/by/4.0/ Atmosphere 9 (2018), 12 Arctic oscillation CMIP5 EP-flux divergence ERA-Interim Major sudden stratospheric warmings MPI-ESM-LR Northern annular mode Polar-night jet oscillation Warm stratospheric events Ozone layer Troposphere Era interims Flux divergences Polar-night jet Stratospheric warmings Climate models CMIP coupling extreme event jet stratosphere-troposphere interaction sudden stratospheric warming zonal wind 550 article Text 2018 ftleibnizopen https://doi.org/10.34657/4633 2023-03-26T23:10:25Z Extreme warm stratospheric events during polar winters from ERA-Interim reanalysis and CMIP5-ESM-LR runs were separated by duration and strength of the polar-night jet oscillation (PJO) using a high statistical confidence level of three standard deviations (strong-PJO events). With a composite analysis, we demonstrate that strong-PJO events show a significantly stronger downward propagating signal in both, northern annular mode (NAM) and zonal mean zonal wind anomaly in the stratosphere in comparison with non-PJO events. The lower stratospheric EP-flux-divergence difference in ERA-Interim was stronger in comparison to long-term CMIP5-ESM-LR runs (by a factor of four). This suggests that stratosphere-troposphere coupling is stronger in ERA-Interim than in CMIP5-ESM-LR. During the 60 days following the central date (CD), the Arctic oscillation signal was more intense during strong-PJO events than during non-PJO events in ERA-Interim data in comparison to CMIP5-ESM-LR runs. During the 15-day phase after CD, strong PJO events had a significant increase in stratospheric ozone, upper tropospheric zonally asymmetric impact, and a regional surface impact in ERA-Interim. Finally, we conclude that the applied high statistical threshold gives a clearer separation of extreme warm stratospheric events into strong-PJO events and non-PJO events including their different downward propagating NAM signal and tropospheric impacts. © 2018 by the authors. Leibniz_Fonds publishedVersion Article in Journal/Newspaper Arctic polar night LeibnizOpen (The Leibniz Association) Arctic |
institution |
Open Polar |
collection |
LeibnizOpen (The Leibniz Association) |
op_collection_id |
ftleibnizopen |
language |
English |
topic |
Arctic oscillation CMIP5 EP-flux divergence ERA-Interim Major sudden stratospheric warmings MPI-ESM-LR Northern annular mode Polar-night jet oscillation Warm stratospheric events Ozone layer Troposphere Era interims Flux divergences Polar-night jet Stratospheric warmings Climate models CMIP coupling extreme event jet stratosphere-troposphere interaction sudden stratospheric warming zonal wind 550 |
spellingShingle |
Arctic oscillation CMIP5 EP-flux divergence ERA-Interim Major sudden stratospheric warmings MPI-ESM-LR Northern annular mode Polar-night jet oscillation Warm stratospheric events Ozone layer Troposphere Era interims Flux divergences Polar-night jet Stratospheric warmings Climate models CMIP coupling extreme event jet stratosphere-troposphere interaction sudden stratospheric warming zonal wind 550 Peters, D.H.W. Schneidereit, A. Karpechko, A.Y. Enhanced stratosphere/troposphere coupling during extreme warm stratospheric events with strong polar-night jet oscillation |
topic_facet |
Arctic oscillation CMIP5 EP-flux divergence ERA-Interim Major sudden stratospheric warmings MPI-ESM-LR Northern annular mode Polar-night jet oscillation Warm stratospheric events Ozone layer Troposphere Era interims Flux divergences Polar-night jet Stratospheric warmings Climate models CMIP coupling extreme event jet stratosphere-troposphere interaction sudden stratospheric warming zonal wind 550 |
description |
Extreme warm stratospheric events during polar winters from ERA-Interim reanalysis and CMIP5-ESM-LR runs were separated by duration and strength of the polar-night jet oscillation (PJO) using a high statistical confidence level of three standard deviations (strong-PJO events). With a composite analysis, we demonstrate that strong-PJO events show a significantly stronger downward propagating signal in both, northern annular mode (NAM) and zonal mean zonal wind anomaly in the stratosphere in comparison with non-PJO events. The lower stratospheric EP-flux-divergence difference in ERA-Interim was stronger in comparison to long-term CMIP5-ESM-LR runs (by a factor of four). This suggests that stratosphere-troposphere coupling is stronger in ERA-Interim than in CMIP5-ESM-LR. During the 60 days following the central date (CD), the Arctic oscillation signal was more intense during strong-PJO events than during non-PJO events in ERA-Interim data in comparison to CMIP5-ESM-LR runs. During the 15-day phase after CD, strong PJO events had a significant increase in stratospheric ozone, upper tropospheric zonally asymmetric impact, and a regional surface impact in ERA-Interim. Finally, we conclude that the applied high statistical threshold gives a clearer separation of extreme warm stratospheric events into strong-PJO events and non-PJO events including their different downward propagating NAM signal and tropospheric impacts. © 2018 by the authors. Leibniz_Fonds publishedVersion |
format |
Article in Journal/Newspaper |
author |
Peters, D.H.W. Schneidereit, A. Karpechko, A.Y. |
author_facet |
Peters, D.H.W. Schneidereit, A. Karpechko, A.Y. |
author_sort |
Peters, D.H.W. |
title |
Enhanced stratosphere/troposphere coupling during extreme warm stratospheric events with strong polar-night jet oscillation |
title_short |
Enhanced stratosphere/troposphere coupling during extreme warm stratospheric events with strong polar-night jet oscillation |
title_full |
Enhanced stratosphere/troposphere coupling during extreme warm stratospheric events with strong polar-night jet oscillation |
title_fullStr |
Enhanced stratosphere/troposphere coupling during extreme warm stratospheric events with strong polar-night jet oscillation |
title_full_unstemmed |
Enhanced stratosphere/troposphere coupling during extreme warm stratospheric events with strong polar-night jet oscillation |
title_sort |
enhanced stratosphere/troposphere coupling during extreme warm stratospheric events with strong polar-night jet oscillation |
publisher |
Basel : MDPI AG |
publishDate |
2018 |
url |
https://doi.org/10.34657/4633 https://oa.tib.eu/renate/handle/123456789/6004 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic polar night |
genre_facet |
Arctic polar night |
op_source |
Atmosphere 9 (2018), 12 |
op_rights |
CC BY 4.0 Unported https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.34657/4633 |
_version_ |
1766333051150794752 |