Classification of stratospheric extreme events according to their downward propagation to the troposphere
Abstract This study presents a classification of stratospheric extreme events during northern winter into events with or without a consistent downward propagation of anomalies to the troposphere. Anomalous strong and weak stratospheric polar vortex events are detected from daily time series of the p...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2016-06-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1002/2016GL069569 |
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| author | T. Runde M. Dameris H. Garny D. E. Kinnison |
| author_facet | T. Runde M. Dameris H. Garny D. E. Kinnison |
| author_sort | T. Runde |
| collection | DOAJ |
| description | Abstract This study presents a classification of stratospheric extreme events during northern winter into events with or without a consistent downward propagation of anomalies to the troposphere. Anomalous strong and weak stratospheric polar vortex events are detected from daily time series of the polar cap averaged (60°–90°N) geopotential height anomaly. The method is applied to chemistry‐climate model data (E39CA and WACCM3.5) and reanalyses data (ERA40). The analyses show that in about 80% of all events no significant tropospheric response can be detected. The stratospheric perturbation of both weak and strong events with a significant tropospheric response persists significantly longer throughout the stratosphere compared to the events without a tropospheric response. The strength of the stratospheric perturbation determines the strength of the tropospheric response only to a small degree. Results are consistent across all three data sets. |
| format | Article |
| id | doaj-art-51543d86dabf42238da21b7dacf346bb |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2016-06-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-51543d86dabf42238da21b7dacf346bb2025-08-20T01:50:59ZengWileyGeophysical Research Letters0094-82761944-80072016-06-0143126665667210.1002/2016GL069569Classification of stratospheric extreme events according to their downward propagation to the troposphereT. Runde0M. Dameris1H. Garny2D. E. Kinnison3Deutsches Zentrum für Luft‐ und Raumfahrt Institut für Physik der Atmosphäre Oberpfaffenhofen GermanyDeutsches Zentrum für Luft‐ und Raumfahrt Institut für Physik der Atmosphäre Oberpfaffenhofen GermanyDeutsches Zentrum für Luft‐ und Raumfahrt Institut für Physik der Atmosphäre Oberpfaffenhofen GermanyNational Center for Atmospheric Research Boulder USAAbstract This study presents a classification of stratospheric extreme events during northern winter into events with or without a consistent downward propagation of anomalies to the troposphere. Anomalous strong and weak stratospheric polar vortex events are detected from daily time series of the polar cap averaged (60°–90°N) geopotential height anomaly. The method is applied to chemistry‐climate model data (E39CA and WACCM3.5) and reanalyses data (ERA40). The analyses show that in about 80% of all events no significant tropospheric response can be detected. The stratospheric perturbation of both weak and strong events with a significant tropospheric response persists significantly longer throughout the stratosphere compared to the events without a tropospheric response. The strength of the stratospheric perturbation determines the strength of the tropospheric response only to a small degree. Results are consistent across all three data sets.https://doi.org/10.1002/2016GL069569Stratospheric dynamicsDownward coupling |
| spellingShingle | T. Runde M. Dameris H. Garny D. E. Kinnison Classification of stratospheric extreme events according to their downward propagation to the troposphere Geophysical Research Letters Stratospheric dynamics Downward coupling |
| title | Classification of stratospheric extreme events according to their downward propagation to the troposphere |
| title_full | Classification of stratospheric extreme events according to their downward propagation to the troposphere |
| title_fullStr | Classification of stratospheric extreme events according to their downward propagation to the troposphere |
| title_full_unstemmed | Classification of stratospheric extreme events according to their downward propagation to the troposphere |
| title_short | Classification of stratospheric extreme events according to their downward propagation to the troposphere |
| title_sort | classification of stratospheric extreme events according to their downward propagation to the troposphere |
| topic | Stratospheric dynamics Downward coupling |
| url | https://doi.org/10.1002/2016GL069569 |
| work_keys_str_mv | AT trunde classificationofstratosphericextremeeventsaccordingtotheirdownwardpropagationtothetroposphere AT mdameris classificationofstratosphericextremeeventsaccordingtotheirdownwardpropagationtothetroposphere AT hgarny classificationofstratosphericextremeeventsaccordingtotheirdownwardpropagationtothetroposphere AT dekinnison classificationofstratosphericextremeeventsaccordingtotheirdownwardpropagationtothetroposphere |