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|Title:||Enhanced stratosphere/troposphere coupling during extreme warm stratospheric events with strong polar-night jet oscillation|
|Authors:||Peters, D.H.W.; Schneidereit, A.; Karpechko, A.Y.|
|Published in:||Atmosphere 9 (2018), 12|
|Publisher:||Basel : MDPI AG|
|Abstract:||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.|
|Keywords:||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; Arctic Oscillation; CMIP5; Era interims; Flux divergences; Northern annular mode; Polar-night jet; Stratospheric warmings; Warm stratospheric events; Climate models; Arctic Oscillation; CMIP; coupling; extreme event; jet; stratosphere-troposphere interaction; sudden stratospheric warming; zonal wind|
|License:||CC BY 4.0 Unported|
|Link to License:||https://creativecommons.org/licenses/by/4.0/|
|Appears in Collections:||Geowissenschaften|
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Peters D H W, Schneidereit A, Karpechko A Y. Enhanced stratosphere/troposphere coupling during extreme warm stratospheric events with strong polar-night jet oscillation. 2018; 9. doi:https://doi.org/10.3390/atmos9120467
Peters, D. H. W., Schneidereit, A. & Karpechko, A. Y. Enhanced stratosphere/troposphere coupling during extreme warm stratospheric events with strong polar-night jet oscillation. vol. 9 (2018).
D. H. W. Peters, A. Schneidereit, A. Y. Karpechko, Enhanced stratosphere/troposphere coupling during extreme warm stratospheric events with strong polar-night jet oscillation. 9 (2018), doi:https://doi.org/10.3390/atmos9120467.
D. H. W. Peters, A. Schneidereit and A. Y. Karpechko, 2018, 9.
D. H. W. Peters, A. Schneidereit, and A. Y. Karpechko, “Enhanced stratosphere/troposphere coupling during extreme warm stratospheric events with strong polar-night jet oscillation,” vol. 9, no. 12. Basel : MDPI AG, 2018, doi: https://doi.org/10.3390/atmos9120467.
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