Abstract
A nonlinear projection of the tropical Pacific sea surface temperature anomalies (SSTA) onto the Northern Hemisphere winter sea level pressure (SLP) anomalies by neural networks (NN) was performed to investigate the nonlinear association between El Niño-Southern Oscillation (ENSO) and the Euro-Atlantic winter climate. While the linear impact of ENSO on the Euro-Atlantic winter SLP is weak, the NN projection reveals statistically significant SLP anomalies over the Euro-Atlantic sector during both extreme cold and warm ENSO episodes, suggesting that the Euro-Atlantic climate mainly responds to ENSO nonlinearly. The nonlinear response, mainly a quadratic response to the SSTA, reveals that regardless of the sign of the SSTA, positive SLP anomalies are found over the North Atlantic, stretching from eastern Canada to Europe (with anomaly center located just northwestward of Portugal), and negative anomalies centered over Scandinavia and Norwegian Sea, consistent with the excitation of the positive North Atlantic Oscillation pattern.
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References
Bishop CM (1995) Neural networks for pattern recognition. Clarendon, Oxford
Cassou C, Terray L (2001) Oceanic forcing of the wintertime low-frequency atmospheric variability in the North Atlantic European sector: a study with the ARPEGE model. J Clim 14:4266–4291
Deser C, Blackmon ML (1995) On the relationship between tropical and North Pacific sea surface temperature variations. J Clim 8:1677–1680
Dong B-W, Sutton RT, Jewson SP, O’Neill A, Slingo JM (2000) Predictable climate in the North Atlantic sector during the 1997–1999 ENSO cycle. Geophys Res Lett 27:985–988
Efron B, Tibshirani RJ (1993) An introduction to the bootstrap. CRC, Boca Raton
Fraedrich K (1994) An ENSO impact on Europe? Tellus 46A:541-552
Fraedrich K, Müller K (1992) Climate anomalies associated with ENSO extremes. Int J Climatol 12:25–31
Halpert MS, Ropelewski CF (1992) Surface temperature patterns associated with the Southern Oscillation. J Clim 5:577–593
Hoerling MP, Kumar A, Zhong M (1997) El Niño, La Niña and the nonlinearity of their teleconnections. J Clim 10:1769–1786
Hoerling MP, Kumar A, Xu T (2001a) Robustness of the nonlinear climate response to ENSO’s extreme phases. J Clim 14:1277–1293
Hoerling MP, Hurrell J, Xu T (2001b) Tropical origins for recent North Atlantic climate change. Science 292:90–92
Hoskins B, Karoly D (1981) The steady linear response of a spherical atmosphere to thermal and orographic forcing. J Atmos Sci 38:1179–1196
Hsieh WW (2001) Nonlinear canonical correlation analysis of the tropical Pacific climate variability using a neural network approach. J Clim 14:2528–2539
Hsieh WW (2004) Nonlinear multivariate and time series analysis by neural network methods. Rev Geophys 42:RG1003. DOI 10.1029/2002RG000112
Hsieh WW, Tang B (1998) Applying neural network models to prediction and data analysis in meteorology and oceanography. Bull Am Meteorol Soc 79:1855–1870
Huang J-P, Higuchi K, Shabbar A (1998) The relation between the North Atlantic Oscillation and El Niño-Southern Oscillation. Geophys Res Lett 25:2707–2710
Hurrell JW, Kushnir Y, Ottersen G, Visbeck M (2003) An Overview of the North Atlantic Oscillation. In: Hurrell JW, Kushnir Y, Ottersen G, Visbeck M (eds) The North Atlantic Oscillation: climate significance and environmental impact. Geophys Monogr Ser 134:1–35
Merkel U, Latif M (2002) A high resolution AGCM study of the El Niño impact on the North Atlantic/European sector. Geophys Res Lett 29:1291–1294. DOI 10.1029/2001GL013726
Montroy DL, Richman MB, Lamb PJ (1998) Observed nonlinearities of monthly teleconnections between tropical Pacific sea surface temperature anomalies and central and eastern North American precipitation. J Clim 11:1812–1835
Pozo-Vázquez D, Esteban-Parra MJ, Rodrigo FS, Castro-Dáez Y (2001) The association between ENSO and winter atmospheric circulation and temperature in the North Atlantic region. J Clim 14:3408-3420
Raible CC, Blender R (2004) Northern hemisphere midlatitude cyclone variability in GCM simulations with different ocean representations. Clim Dyn 22:239–248. DOI 10.1007/s00382-003-0380-y
Rogers JC (1984) The association between the North Atlantic Oscillation and the Southern Oscillation in the Northern Hemisphere. Mon Wea Rev 112:1999–2015
Shabbar A, Bonsal B, Khandekar M (1997) Canadian precipitation patterns associated with Southern Oscillation. J Clim 10:3016–3027
Smith TM, Reynolds RW (2003) Extended reconstruction of global sea surface temperatures based on COADS data (1854–1997). J Clim 16:1495–1510
Sutton RT, Hodson DLR (2003) Influence of the Ocean on North Atlantic climate variability 1981–1999. J Clim 16:3296–3313
Thompson DWJ, Wallace JM (1998) The Arctic Oscillation signature in the wintertime geopotential height and temperature fields. Geophys Res Lett 25:1297–1300
Thompson DWJ, Wallace JM (2000) Annular modes in the extratropical circulation. Part I: month-to-month variability. J Clim 13:1000–1016
Trenberth KE, Paolino DA (1980) The Northern Hemisphere sea level pressure data set: trends, errors and discontinuities. Mon Wea Rev 108:855–872
Trenberth KE, Branstator GW, Karoly D, Kumar A, Lau N-C, Ropelewski C (1998) Progress during TOGA in understanding and modelling global teleconnections associated with tropical sea surface temperatures. J Geophys Res 103:14291–14324
Wallace JM, Gutzler D (1981) Teleconnection in the geopotential height filed during the Northern Hemisphere winter. Mon Wea Rev 109:784–812
Wu A, Hsieh WW (2004) The nonlinear Northern Hemisphere winter atmospheric response to ENSO. Geophys Res Lett 31:L02203. DOI 10.1029/2003GL018885
Wu A, Hsieh WW, Zwiers FW (2003) Nonlinear modes of North American winter climate variability derived from a general circulation model simulation. J Clim 16:2325–2339
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The authors acknowledge the support from the Natural Sciences and Engineering Research Council of Canada via research and strategic grants.
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Wu, A., Hsieh, W.W. The nonlinear association between ENSO and the Euro-Atlantic winter sea level pressure. Climate Dynamics 23, 859–868 (2004). https://doi.org/10.1007/s00382-004-0470-5
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DOI: https://doi.org/10.1007/s00382-004-0470-5