ID:
publications-1436
Type:
PEER REVIEWED ARTICLE
Year:
2016
Authors:
T. Runde , M. Dameris , H. Garny , D. E. Kinnison
Title:
Classification of stratospheric extreme events according to their downward propagation to the troposphere
Venue/Journal:
DOI:
10.1002/2016gl069569
Research type:
Data Management & Analytics
Water System:
Uncategorized
Technical Focus:
Abstract:
AbstractThis 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.
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603557
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