Theoretical and Applied Climatology

, Volume 49, Issue 1, pp 9–18 | Cite as

Pressure covariability over the Atlantic, Europe and N. Africa. application: Centers of action for temperature, winter precipitation and summer winds in Athens, Greece

  • D. A. Metaxas
  • A. Bartzokas


This paper deals with the surface pressure covariability over the Altantic/European sector of the Northern Hemisphere, using monthly grid point data for the 100 year period 1890–1989. Factor analysis is applied to 90 grid point time series for January, February, July, and August. The initial 90 pressure variables can be reduced to 7–8 factors in winter and 10 in summer. A winter teleconnection was identified, known as the seesaw phenomenon, between the Icelandic low and the Azores subtropical anticyclone. In order to define the centers of action for temperature, winter precipitation and summer northerly wind frequency (etesian days) in Athens and in the Aegean sea, the variability of the factor scores and of these weather elements is compared. It is shown that the center of action for temperature in Athens is found to be in north and northwest Europe (centered over southern Scandinavia). For winter precipitation, the center of action is located in the west and southwest Mediterranean and northwest Africa. Finally, for the etesian winds frequency variability, this center of action is found over the northern Adriatic and northern former Yugoslavia, while there is no evidence of influence by the southwest Asia thermal low.


Waste Water Grid Point Northern Hemisphere Surface Pressure Factor Score 
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.


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  1. Alpert, P., Neeman, B. U., Shay-El, Y., 1990: Intermonthly variability of cyclone tracks in the Mediterranean.J. Climate 3, 1474–1478.Google Scholar
  2. Bartzokas, A., Metaxas, D. A., 1993: Covariability and climatic changes of the lower-Troposphere temperatures over the northern hemisphere.II Nuovo Cimento 16C, 359–373Google Scholar
  3. Hannes, G., 1974: Factor analysis of coastal air and water temperatures.J. Appl. Meteor. 13, 3–7.Google Scholar
  4. Horel, J. D., 1981: A rotated principal component analysis of the interannual variability of the northern hemisphere 500 mb height field.Mon. Wea. Rev. 109, 2080–2092.Google Scholar
  5. Jolliffe, I. T., 1986:Principal Component Analysis. New York: Springer, 271 pp.Google Scholar
  6. Jolliffe, I. T., 1993: Principal component analysis: A beginner's guide — II. Pitfalls, myths and extensions.Weather 48, 246–253.Google Scholar
  7. Karapiperis, L., 1951: On the periodicity of Etesian in Athens.Weather 6, 378–379.Google Scholar
  8. Karoulias, A., 1977: Les dépressions Sahariennes et leur déplacement vers la partie sud de la péninsule Balkanique ou la Méditerranée orientale.La Météorologie VI(8), 209–212.Google Scholar
  9. Kutzbach, E. J., 1970: Large scale features of monthly mean northern hemisphere anomaly maps of sea-level pressure.Mon. Wea. Rev. 98, 708–716.Google Scholar
  10. Makrogiannis, T. J., Dikaiakos, J. C., 1990: Large scale patterns of atmospheric circulation anomalies associated to long spells of etesian wind-days over Greece. In: Brazdil, R. (ed.)Climatic Change in the Historical and the Instrumental Periods. Brno: Mararyk University, pp. 307–309.Google Scholar
  11. Manly, B. F. J., 1986:Multivariate Statistical Methods: A Primer. London: Chapman & Hall, 159 pp.Google Scholar
  12. Maheras, P., 1980: Le probleme des etesiens.Revue Geographique Mediterraneen 40, 55–66.Google Scholar
  13. Metaxas, D. A., 1977: The interannual variability of the etesian frequency as a response of atmospheric circulation anomalies.Bull. Hell. Meteor. Soc. 2(5), 30–40.Google Scholar
  14. Metaxas, D. A., 1978: Evidence on the importance of diabatic heating as a divergence factor in the Mediterranean.Arch. Met. Geoph. Biokl. Ser. A 27, 69–80.Google Scholar
  15. Metaxas, D. A., Bartzokas, A., Vitsas, A., 1991: Temperature fluctuations in the Mediterranean area during the last 120 yearsInt.J. Climatol. 11, 897–908Google Scholar
  16. Metaxas, D. A., Bartzokas, A., Repapis, C. C., Dalezios, N. R., 1993: Atmospheric circulation anomalies in dry and wet winters in Greece.Meteorol. Zeitschrift 2, 127–131.Google Scholar
  17. Moses, T., Kiladis, G. N., Diaz, H. F., Barry, R. G., 1987: Characteristics and frequency of reversals in mean sea level pressure in the north Atlantic sector and their relationship to long-term temperature trends.J. Climatol. 7, 13–30.Google Scholar
  18. Overland, J. E., Preisendorfer, R. W., 1982: A significant test for principal components applied to a cyclone climatology.Mon. Wea. Rev. 110, 1–4.Google Scholar
  19. Reiter, E., Metaxas, D. A., 1971: The Etesians. In:The Workshop on Mediterranean Weather. Erice-Trapani (Italy), pp. 114–132.Google Scholar
  20. Repapis, C. C., Metaxas, D. A., 1986: The possible influence of the urbanization in Athens city on the air temperature climatic fluctuations at the national observatory.Proceedings of the 3rd Hellenic-British Climatological congress. Athens, pp. 188–195.Google Scholar
  21. Repapis, C. C., Zerefos, C. Z., 1990: Evidence for the southern oscillation in the variation of the etesian winds. In: Asimakopoulos, D., Theoharatos, G. (eds.)In Memoriam L. Carapiperis. Athens: University of Athens, pp. 348–355.Google Scholar
  22. Richman, M. B., 1981: Obliquely rotated components: An improved meteorological map typing technique.J. Appl. Meteor. 20, 1145–1159.Google Scholar
  23. Rogers, J. C., 1990: Patterns of low-frequency monthly sea level pressure variability (1899–1986) and associated wave cyclone frequencies.J. Climate 3, 1364–1379.Google Scholar
  24. Rummel, R. J., 1970:Applied Factor Analysis. Evanston: Northwestern University, Press, 617 pp.Google Scholar
  25. van Loon, H., Rogers, J. C., 1978: The seesaw in winter temperatures between Greenland and northern Europe. Part I: General description.Mon. Wea. Rev. 106, 296–310.Google Scholar
  26. Wallace, J. M., Gutzler, D. S., 1981: Teleconnections in the geopotential height field during the northern hemisphere winter.Mon. Wea. Rev. 109, 784–812.Google Scholar

Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • D. A. Metaxas
    • 1
  • A. Bartzokas
    • 1
  1. 1.Laboratory of Meteorology, Department of PhysicsUniversity of IoanninaGreece

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