期刊
GEOPHYSICAL RESEARCH LETTERS
卷 43, 期 12, 页码 6665-6672出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL069569
关键词
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资金
- Deutsche Forschungsgemeinschaft (DFG) within the Research Unit SHARP [DA 233/4-1, DA 233/4-2]
- Federal Ministry of Education and Research (BMBF) [01LP1168B]
- EU [603557-FP7-ENU.2013.6.1-2]
- Helmholtz Association [VH-NG-1014]
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 degrees - 90 degrees 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.
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