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Climate Dynamics

, Volume 28, Issue 2–3, pp 231–254 | Cite as

ENSO forcing of the Northern Hemisphere climate in a large ensemble of model simulations based on a very long SST record

  • Ivana Herceg BulićEmail author
  • Čedo Branković
Article

Abstract

The January–March (JFM) climate response of the Northern Hemisphere atmosphere to observed sea surface temperature (SST) anomalies for the period 1855–2002 is analysed from a 35-member ensemble made with SPEEDY, an atmospheric general circulation model (AGCM) of intermediate complexity. The model was run at the T30-L8 resolution, and initial conditions and the early stage of model runs differ among ensemble members in the definition of tropical diabatic heating. SST anomalies in the Niño3.4 region were categorised into five classes extending from strong cold to strong warm. Composites based on such a categorisation enabled an analysis of the influence of the tropical Pacific SST on the Northern Hemisphere atmospheric circulation with an emphasis on the Pacific-North America (PNA) and the North Atlantic-Europe (NAE) regions. As expected, the strongest signal was detected over the PNA region. An “asymmetry” in the model response was found for the opposite polarity of the Niño3.4 index; however, this asymmetry stems mainly from the difference in the amplitude of model response rather than from the phase shift between responses to warm and cold El Niño-Southern Oscillation (ENSO) events. The extratropical signal associated with warm ENSO events was found to be stronger than that related to cold events. The results also reveal that, for the PNA region, the amplitude of the response is positively correlated with the strength of ENSO, irrespective of the sign of ENSO. With almost no phase shift between model responses to El Niño and La Niña, the linear component of the response is much stronger than the non-linear component. Although the model climate response over the NAE region is much weaker than that over the PNA region, some striking similarities with the PNA are found. Both sea level pressure and precipitation responses are positively correlated with the strength of ENSO. This is not true for the 200-hPa geopotential heights, and no plausible explanation for such a result could be offered. An appreciable linear component in model response over the NAE was also found. The model results over the NAE region agree reasonably well with observational studies. An additional analysis of the remote atmospheric response to very weak ENSO forcing (defined from the interval between 0.5σ and 1.0σ of the interannual variance) was also carried out. A discernible model response in the Northern Hemisphere to such a weak SST forcing was found.

Keywords

Precipitation Anomaly Atmospheric General Circulation Model ENSO Event Cold Event Atmospheric Response 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

We are grateful to the two anonymous reviewers for their comments and suggestions that greatly improved the final version of the paper. The work of I. Herceg Bulić was supported by the Ministry of Science, Education and Sports of the Republic of Croatia under the Project no. 0119330.

References

  1. Bourke W (1974) A multilevel spectral model. I. formulation and hemispheric integrations. Mon Weather Rev 102:687–701CrossRefGoogle Scholar
  2. Bracco A, Kucharski F, Kallummal R, Molteni F (2004) Internal variability, external forcing and climate trends in multidecadal AGCM ensembles. Clim Dynam 23:659–678CrossRefGoogle Scholar
  3. Branković Č, Molteni F (2004) Seasonal climate and variability of the ECMWF ERA-40 model. Clim Dynam 22:139–155CrossRefGoogle Scholar
  4. Branković Č, Palmer TN (1997) Atmospheric seasonal predictability and estimates of ensemble size. Mon Weather Rev 125:859–874CrossRefGoogle Scholar
  5. Branstator G (1985) Analysis of general circulation model sea surface temperature anomaly simulations using linear model. Part I: Forced solutions. J Atmos Sci 42:2225–2241CrossRefGoogle Scholar
  6. Chen WY (2004) Significant change of extratropical natural variability associated with tropical ENSO anomaly. J Climate 17:2019–2030CrossRefGoogle Scholar
  7. Chen WY, Van den Dool HM (1995) Low-frequency variabilities for widely different basic flows. Tellus 47A:526–540Google Scholar
  8. Chen WY, Van den Dool HM (1997a) Atmospheric predictability of seasonal, annual and decadal climate means and the role of the ENSO cycle: a model study. J Climate 10:1236–1254CrossRefGoogle Scholar
  9. Chen WY, Van den Dool HM (1997b) Asymmetric impact of tropical SST anomalies on atmospheric internal variability over the North Pacific. J Atmos Sci 54:725–740CrossRefGoogle Scholar
  10. DeWeaver E, Nigam S (2002) Linearity in ENSO’s atmospheric response. J Climate 15:2446–2461CrossRefGoogle Scholar
  11. Fraedrich K (1990) European Grosswetter during the warm and cold extremes of the El Niño/Southern Oscillation. Int J Climatol 10:21–31CrossRefGoogle Scholar
  12. Fraedrich K (1993) An ENSO impact on Europe? Tellus 46A:541–552Google Scholar
  13. Fraedrich K, Müller K (1992) Climate anomalies in Europe associated with ENSO extremes. Int J Climatol 12:25–31Google Scholar
  14. Graham N E, Barnett TP (1987) Observations of sea surface temperatures, convection and surface wind divergence over tropical oceans. Science 238:657–659CrossRefGoogle Scholar
  15. Hannachi A (2001) Toward a nonlinear identification of the atmospheric response to ENSO. J Climate 14:2138–2149CrossRefGoogle Scholar
  16. Halpert MS, Ropelewski CF (1992) Surface temperature patterns associated with the Southern oscillation. J Climate 5:577–593CrossRefGoogle Scholar
  17. Hazeleger W, Severijns C, Seager R, Molteni F (2005) Tropical Pacific-driven decadel energy transport variability. J Climate 18:2037–2051CrossRefGoogle Scholar
  18. Held IM, Suarez MJ (1994) A proposal for the intercomparison of dynamical cores of atmospheric general circulation models. Bull Am Meteorol Soc 75:1825–1830CrossRefGoogle Scholar
  19. Herceg Bulić I, Branković Č (2006) Seasonal climate sensitivity to the sea-ice cover in an intermediate complexity AGCM. Geofizika 23:37–58Google Scholar
  20. Hoerling MP, Kumar A, Zhong M (1997) El Niño, La Niña, and the nonlinearity of their teleconnections. J Climate 10:1769–1786CrossRefGoogle Scholar
  21. Hoerling MP, Kumar A, Xu T (2001) Robustness of the nonlinear climate response to ENSO’s extreme phases. J Climate 14:1277–1293CrossRefGoogle Scholar
  22. Horel J, Wallace JM (1981) Planetary scale phenomena associated with the Southern Oscillation. Mon Weather Rev 109:813–829CrossRefGoogle Scholar
  23. Hoskins BJ, Karoly DJ (1981) The steady linear response of a spherical atmosphere to thermal and orographic forcing. J Atmos Sci 38:1179–1196CrossRefGoogle Scholar
  24. Kalnay E, et al (1996) The NCEP/NCAR 40–year Reanalysis Project. Bull Am Meteorol Soc 77:437–471CrossRefGoogle Scholar
  25. Kiladis GN, Diaz HF (1989) Global climatic anomalies associated with extremes in the Southern Oscillation. J Climate 10:1069–1091CrossRefGoogle Scholar
  26. Kucharski F, Molteni F, Bracco A (2006) Decadal interactions between the western tropical Pacific and the North Atlantic Oscillation. Clim Dynam 26:79–91CrossRefGoogle Scholar
  27. Kumar A, Hoerling MP (1998) Annual cycle of Pacific-North American seasonal predictability associated with different phases of ENSO. J Climate 11:3295–3308CrossRefGoogle Scholar
  28. Kumar A, Barnston AG, Peng P, Hoerling MP, Goddard L (2000) Changes in the spread of the variability of the seasonal mean atmospheric states associated with ENSO. J Climate 13:3139–3151CrossRefGoogle Scholar
  29. Lau N-C, Nath M (1996) The role of the “atmospheric bridge” in linking tropical Pacific ENSO events to extratropical SST anomalies. J Climate 9:2036–2056CrossRefGoogle Scholar
  30. Mathieu P-P, Sutton RT, Dong B, Collins M (2004) Predictability of winter climate over the North Atlantic-European region during ENSO events. J Climate 17:1953–1974CrossRefGoogle Scholar
  31. 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 DOI 10.1029/2001GL013726Google Scholar
  32. Mo KC, Livezy RE (1986) Tropical-extratropical geopotential height teleconnections during the Northern Hemisphere winter. Mon Weather Rev 114:2488–2515CrossRefGoogle Scholar
  33. Mo R, Fyfe J, Derome J (1998) Phase-locked asymmetric correlations of the wintertime atmospheric patterns with the ENSO. Atmos Ocean 36:213–239Google Scholar
  34. Molteni F (2003) Atmospheric simulations using a GCM with simplified physical parametrizations. I: model climatology and variability in multi-decadal experiments. Clim Dynam 20:175–191Google Scholar
  35. Molteni F, Corti S (1998) Long-term fluctuations in the statistical properties of low-frequency variability: dynamic origin and predictability. Q J Roy Meteor Soc 124:495–526CrossRefGoogle Scholar
  36. Molteni F, Ferranti L, Palmer TN, Viterbo P (1993) A dynamical interpretation of the global response to equatorial Pacific SST anomalies. J Climate 6:777–795CrossRefGoogle Scholar
  37. Moron V, Plaut G (2003) The impact of El Niño-Southern Oscillation upon weather regimes over Europe and the North Atlantic sector during boreal winter. Int J Climatol 23:363–379CrossRefGoogle Scholar
  38. Nakamura H, Tanaka M, Wallace JM (1987) Horizontal structure and energetics of Northern Hemisphere wintertime teleconnections patterns. J Atmos Sci 44:3377–3391CrossRefGoogle Scholar
  39. Palmer TN (1988) Medium and extended range predictability and stability of the Pacific/North American mode. Q J Roy Meteor Soc 114:691–713CrossRefGoogle Scholar
  40. Palmer TN (1993) Extended-range atmospheric prediction and the Lorenz model. Bull Am Meteorol Soc 74:49–65CrossRefGoogle Scholar
  41. Peng P, Kumar A (2005) A large ensemble analysis of the influence of tropical SSTs on seasonal atmospheric variability. J Climate 18:1068–1085CrossRefGoogle Scholar
  42. Pitcher EJ, Blackmon ML, Bates GT, Muñoz S (1988) The effect of North Pacific sea surface temperature anomalies on the January climate of a general circulation mode. J Atmos Sci 45:173–188CrossRefGoogle Scholar
  43. Rasmusson EM, Mo KC (1993) Linkages between 200-mb tropical and extratropical circulation anomalies during the 1986–1989 ENSO cycle. J Climate 6:595–616CrossRefGoogle Scholar
  44. Rayner NA, Parker DE, Horton EB, Folland CK, Alexander LV, Rowell DP, Kent EC, Kaplan A (2003) Global analyses of SST, sea ice, and night marine air temperature since late nineteenth century. J Geophys Res 108:4407, DOI 10.1029/2002JD002670Google Scholar
  45. Ropelewski CF, Halpert MS (1986) North American precipitation and temperature patterns associated with the El Niño/Southern Oscillation (ENSO). Mon Weather Rev 114:2352–2362CrossRefGoogle Scholar
  46. Sardeshmukh PS, Hoskins BJ (1988) The generation of global rotational flow by steady idealized tropical divergence. J Atmos Sci 45:1228–1251CrossRefGoogle Scholar
  47. Sardeshmukh PS, Compo G, Penland C (2000) Changes in probability associated with El Niño. J Climate 13:4268–4286CrossRefGoogle Scholar
  48. Schubert SD, Suarez MJ, Chang Y, Branstator GW (2001) The impact of ENSO on extratropical low-frequency noise in seasonal forecasts. J Climate 14:2351–2365CrossRefGoogle Scholar
  49. Seager R, Harnik N, Kushnir Y, Robinson W, Miller J (2003) Mechanisms of hemispherically symmetric climate variability. J Climate 16:2960–2978CrossRefGoogle Scholar
  50. Seager R, Kushnir Y, Herweijer C, Naik N, Velez J (2005) Modeling of tropical forcing of persistent droughts and pluvials over western North America: 1856–2000. J Climate 18:4065–4088CrossRefGoogle Scholar
  51. Trenberth KE (1997) The definition of El Niño. Bull Am Meteorol Soc 78:2771–2777CrossRefGoogle Scholar
  52. Trenberth KE, Branstator GW, Karoly D, Kumar A, Lau N-C, Ropelewski C (1988) Progress during TOGA in understanding and modelling global teleconnections associated with tropical sea surface temperatures. J Geophys Res 103:14291–14324CrossRefGoogle Scholar
  53. Van Oldenborgh GJ, Burgers G, Klein Tank A (2000) On the El Niño teleconnection to spring precipitation in Europe. Int J Climatol 20:565–574CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  1. 1.Andrija Mohorovičić Geophysical Institute, Faculty of ScienceUniversity of ZagrebZagrebCroatia
  2. 2.Croatian Meteorological and Hydrological ServiceZagrebCroatia

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