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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ftmdpi:oai:mdpi.com:/2073-4433/9/12/467/ 2023-08-20T04:04:22+02:00 Enhanced Stratosphere/Troposphere Coupling During Extreme Warm Stratospheric Events with Strong Polar-Night Jet Oscillation Dieter H.W. Peters Andrea Schneidereit Alexey Y. Karpechko agris 2018-11-29 application/pdf https://doi.org/10.3390/atmos9120467 EN eng Multidisciplinary Digital Publishing Institute Meteorology https://dx.doi.org/10.3390/atmos9120467 https://creativecommons.org/licenses/by/4.0/ Atmosphere; Volume 9; Issue 12; Pages: 467 warm stratospheric events major sudden stratospheric warmings polar-night jet oscillation northern annular mode Arctic oscillation EP-flux divergence ERA-Interim CMIP5 MPI-ESM-LR Text 2018 ftmdpi https://doi.org/10.3390/atmos9120467 2023-07-31T21:52:21Z 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. Text Arctic polar night MDPI Open Access Publishing Arctic Atmosphere 9 12 467 |
institution |
Open Polar |
collection |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
warm stratospheric events major sudden stratospheric warmings polar-night jet oscillation northern annular mode Arctic oscillation EP-flux divergence ERA-Interim CMIP5 MPI-ESM-LR |
spellingShingle |
warm stratospheric events major sudden stratospheric warmings polar-night jet oscillation northern annular mode Arctic oscillation EP-flux divergence ERA-Interim CMIP5 MPI-ESM-LR Dieter H.W. Peters Andrea Schneidereit Alexey Y. Karpechko Enhanced Stratosphere/Troposphere Coupling During Extreme Warm Stratospheric Events with Strong Polar-Night Jet Oscillation |
topic_facet |
warm stratospheric events major sudden stratospheric warmings polar-night jet oscillation northern annular mode Arctic oscillation EP-flux divergence ERA-Interim CMIP5 MPI-ESM-LR |
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. |
format |
Text |
author |
Dieter H.W. Peters Andrea Schneidereit Alexey Y. Karpechko |
author_facet |
Dieter H.W. Peters Andrea Schneidereit Alexey Y. Karpechko |
author_sort |
Dieter H.W. Peters |
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 |
Multidisciplinary Digital Publishing Institute |
publishDate |
2018 |
url |
https://doi.org/10.3390/atmos9120467 |
op_coverage |
agris |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic polar night |
genre_facet |
Arctic polar night |
op_source |
Atmosphere; Volume 9; Issue 12; Pages: 467 |
op_relation |
Meteorology https://dx.doi.org/10.3390/atmos9120467 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/atmos9120467 |
container_title |
Atmosphere |
container_volume |
9 |
container_issue |
12 |
container_start_page |
467 |
_version_ |
1774714763573460992 |