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    Stratospheric response to Arctic sea ice retreat and associated planetary wave propagation changes (2013)
    WILEY-BLACKWELL PUBLISHING
    In:  EPIC3Tellus Series A-Dynamic Meteorology and Oceanography, WILEY-BLACKWELL PUBLISHING, 65, pp. 19375, ISSN: 0280-6495
    Details
    Publication Date: 2019-07-17
    Description: The stratospheric response to the observed Arctic sea ice retreat is analysed based on European Centre for Medium-Range Weather Forecast (ECMWF) Re-Analysis Interim (ERA-Interim) atmospheric data from 1979-2012. It is shown that changes in August/September sea ice concentration impact on tropospheric and stratospheric geopotential heights in the following winter. During low ice phases a negative tropospheric Arctic Oscillation pattern is found, which is connected to a weakened stratospheric polar vortex and warmer stratospheric temperatures. Furthermore, the analysis reveals enhanced upward EP fluxes due to planetary waves for low ice conditions. Strong stratospheric anomalies in the Atlantic/European region are associated with a weaker polar vortex. Low ice periods are connected with additional tropospheric wave energy excitation in the Pacific/North America region and influence the stratosphere through three-dimensional planetary wave propagation.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 2
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    How well do state-of-the-art Atmosphere-Ocean general circulation models reproduce atmospheric teleconnection patterns? (2012)
    WILEY-BLACKWELL PUBLISHING
    In:  EPIC3Tellus Series A-Dynamic Meteorology and Oceanography, WILEY-BLACKWELL PUBLISHING, 64(19777), pp. 1-27, ISSN: 0280-6495
    Details
    Publication Date: 2019-07-17
    Description: This article evaluates the ability of state-of-the-art climate models to reproduce the low-frequency variability of the mid-tropospheric winter flow of the Northern Hemisphere in terms of atmospheric teleconnection patterns. Therefore, multi-model simulations for present-day conditions, performed for the 4th assessment report of the Intergovernmental Panel on Climate Change, have been analysed and compared with re-analysis data sets. The spatial patterns of atmospheric teleconnections are reproduced reasonably by most of the models. The comparison of coupled with atmosphere-only runs confirmed that a better representation of the forcing by sea surface temperatures has the potential to slightly improve the representation of only wave train-like patterns. Due to internally generated climate variability, the models are not able to reproduce the observed temporal behaviour. Insights into the dynamical reasons for the limited skill of climate models in reproducing teleconnections have been obtained by studying the relation between major teleconnections and zonal wind variability patterns. About half of the models are able to reproduce the observed relationship. For these cases, the quality of simulated teleconnection patterns is largely determined by the quality of zonal wind variability patterns. Therefore, improvements of simulated eddy-mean flow interaction have the potential to improve the atmospheric teleconnections.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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    Format: application/pdf
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