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North Atlantic weather regimes response to Indian-western Pacific Ocean warming: A multi-model study

North Atlantic weather regimes response to Indian-western Pacific Ocean warming: A multi-model study,10.1029/2008GL034345,Geophysical Research Letters

North Atlantic weather regimes response to Indian-western Pacific Ocean warming: A multi-model study   (Citations: 2)
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The extratropical large-scale atmospheric circulation is often described in terms of a few preferred and recurrent patterns referred to as weather regimes. Here, we investigate the influence of the observed Indian and western Pacific Ocean (IP) warming over the last decades, on the frequency of occurrence of North Atlantic weather regimes. A multi-model approach is adopted in which five different atmospheric general circulation models are forced with idealized sea surface temperature patterns mimicking the IP warming. Despite some discrepancies, three models suggest a stronger occurrence of the Zonal regime when IP is warm, compensated by less frequent Greenland Anticyclone regimes, consistently with the observed positive trend of the North Atlantic Oscillation. The other two models simulate instead an increase in the frequency of occurrence of the Atlantic Ridge regime. Variance decomposition into stationary and transient waves suggest two mechanisms at work in the individual models. The AR regime favoured occurrence is associated with a strong transient wave activity along the wave guide in the North Pacific and downstream in the North Atlantic. The Zonal favoured excitation is interpreted as an indirect response to changes in the Tropical Atlantic associated with a global alteration of the Walker cell.
Journal: Geophysical Research Letters - GEOPHYS RES LETT , vol. 35, no. 15, 2008
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    • ...The LASG/IAP model has been involved in both past climate simulation and future climate projection activities organized by the World Climate Research Program Coupled Model Inter-comparison Project (WCRP CMIP) for the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (AR4) and many other international projects (Zhou et al., 2005a; Zhou and Yu, 2006; Li et al., 2007; Yu et al., 2008; Sanchez-Gomez et al., 2008; Zhou ...

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