This research was funded by the Strategic Environmental Assessments Division of the National Oceanic and Atmospheric Administration’s National Ocean Service (Contract NA270A0280-01). We extend our sincere thanks to Kevin Trenberth and Roy Jenne for providing portions of the data used in our analyses.
Angell, J. K., and J. Korshover, 1974: Quasi-biennial and long-term fluctuations in the centers of action. Mon. Wea. Rev.,102, 669–678.
Brezowsky, H., H. Flohn, and P. Hess, 1951: Some remarks on the climatology of blocking action. Tellus,3, 191–194.
Briffa, K. R., P. D. Jones, and P. M. Kelly, 1990: Principal component analysis of Lamb catalogue of daily weather types: Part 2, seasonal frequencies and update to 1987. Int. J. Climatol.,10, 549–563.
Christy, J. R., and K. E. Trenberth, 1985: Hemisphericinterannual fluctuations in the distribution of atmospheric mass. J. Geophys. Res.,90 (D5), 8053–8065.
Daultrey, S., 1976: Principal Components Analysis. Concepts and Techniques in Modern Geography, Vol. 8, Univ. of East Anglia, 51 pp.
Deser, C., and M. L. Blackmon, 1993: Surface climate variations over the North Atlantic Ocean during winter: 1900–1989. J. Climate,6, 1743–1753.
Duquet, R. T., 1963: The January warm spell and associated large-scale circulation changes. Mon. Wea. Rev.,91, 47–60.
Dzerdzeevskii, B., 1962: Fluctuations of climate and of general circulation of the atmosphere in extra-tropical latitudes of the Northern Hemisphere and some problems of dynamic climatology. Tellus,14, 328–336.
——, 1969: Climatic epochs in the 20th century and some comments on the analysis of past climates. Proc. Seventh Congress on Quaternary Geology and Climate INQUA 16, Washington, DC, Natl. Acad. Sci., 49–60.
Hansen, J., I. Fung, A. Lacis, D. Rind, S. Lebedeff, R. Ruedy, and G. Russell, 1988: Global climate changes as forecast by the Goddard Institute for Space Studies three-dimensional model. J. Geophys. Res.,93, 9341–9364.
Harman, J. R., 1987: Mean monthly North American anticyclone frequencies, 1950–79. Mon. Wea. Rev.,115, 2840–2848.
Hayden, B. P., 1976: January-thaw singularity and wave climates along the eastern coast of the USA. Nature,263, 491–492.
Houghton, J. T., G. J. Jenkins, and J. J. Ephraums, 1990: Climate Change, the IPCC Scientific Assessment. Cambridge University Press, 365 pp.
Kalnicky, R. A., 1974: Climatic change since 1950. Ann. Assoc. Amer. Geogr.,64, 100–112.
Klein, W. H., 1957: Principal tracks and mean frequencies of cyclones and anticyclones in the Northern Hemisphere. Weather Bureau Research Paper 40, 60 pp.
Kutzbach, J. E., 1970: Large-scale features of monthly mean Northern Hemisphere anomaly maps of sea-level pressure. Mon. Wea. Rev.,98, 708–716.
Lamb, H. H., 1968: The Changing Climate. Methuen, 236 pp.
——, 1973: The seasonal progression of the general atmospheric circulation affecting the North Atlantic and Europe. University of East Anglia Research Publ. 1, 83 pp. [Available from University of East Anglia, Norwich, United Kingdom.].
Lazante, J. R., and R. P. Harnack, 1982: The January thaw at New Brunswick, NJ. Mon. Wea. Rev.,110, 792–799.
Legates, D. R., 1991: The effect of domain shape on principal components analyses. Int. J. Climatol.,11, 135–146.
——, 1993: The effect of domain shape on principal components analyses: A reply. Int. J. Climatol.,13, 219–228.
——, and C. J. Willmott, 1984: On the use of factor analytic techniques with geophysical data. Proc. 15th Annual Pittsburgh Conf. on Modeling and Simulation, Pittsburgh, PA, School of Engineering, University of Pittsburgh, 417–426.
Makrogiannis, T. J., 1988: The time variations of the relative mass of air over the major part of Europe. Z. Meteor.,2, 80–86.
——, A. A. Bloutsos, and B. D. Giles, 1982: Zonal index and circulation changein the North Atlantic area, 1873–1972. J. Climatol.,2, 159–169.
North, G. R., T. L. Bell, and R. F. Cahalan, 1982: Sampling errors in the estimation of empirical orthogonal functions. Mon. Wea. Rev.,110, 699–706.
Overland, J. E., and R. W. Preisendorfer, 1982: A significance test for principal components applied to a cyclone climatology. Mon. Wea. Rev.,110, 1–4.
Parker, D. E., and C. K. Folland, 1988: The nature of climate variability. Meteor. Mag.,117, 201–210.
Perry, A. H., 1971: Changes in position and intensity of major Northern Hemisphere ‘centres of action.’ Weather,26, 268–270.
Rex, D. F., 1950: Blocking action in the middle troposphere and its effect upon regional climate II. The climatology of blocking action. Tellus,2, 275–301.
Richman, M. B., 1986: Rotation of principal components. J. Climatol.,6, 293–335.
——, 1993: Comments on: ‘The effect of domain shape on principal components analyses.’ Int. J. Climatol.,13, 203–218.
Rind, D., R. Goldberg, J. Hansen, C. Rosenzweig, and R. Ruedy, 1990: Potential evapotranspiration and the likelihood of future drought. J. Geophys. Res.,95 (D7), 9983–10 004.
Sahsamanoglou, H. S., 1990a: A contribution to the study of action centres in the North Atlantic. Int. J. Climatol.,10, 247–261.
——, 1990b: Comparison of North Atlantic and North Pacific zonal circulation by means of zonal indices. Z. Meteor.,40, 395–404.
——, and T. J. Makrogiannis, 1992: Temperature trends over the Mediterranean region, 1950–88. Theor. Appl. Climatol.,45, 183–192.
Stahle, D. W., and M. K. Cleaveland, 1992: Reconstruction and analysis of spring rainfall over the southeastern U.S. for the past 1000 years. Bull. Amer. Meteor. Soc.,73, 1947–1961.
Teissereng de Bort, L., 1883: Etude sur l’hiver de 1879–80 et recherches sur la position des centres d’action de l’atmosphere dans les hivers anormaux. Bureau Central Meteor. de la France, Annales, 1881,4, 17–62.
Trenberth, K. E., and D. A. Paolino Jr., 1980: The Northern Hemisphere sea-level pressure data set: Trends, errors, and discontinuities. Mon. Wea. Rev.,108, 855–872.
Trewartha, G. T., and L. H. Horn, 1980: An Introduction to Climate. McGraw Hill, 416 pp.
Wagner, A. J., 1971: Long-period variations in seasonal sea-level pressure over the Northern Hemisphere. Mon. Wea. Rev.,99, 49–66.
Wahl, E. W., 1952: The January thaw in New England (An example of a weather singularity). Bull. Amer. Meteor. Soc.,33, 380–386.
——, 1953: Singularities and the general circulation. J. Meteor.,10, 42–45.
Washington, W. M., and G. A. Meehl, 1989: Climate sensitivity due to increased CO2: Experiments with a coupled atmosphere and ocean general circulation model. Climate Dyn.,4, 1–38.
Williams, J., and H. van Loon, 1976: An examination of the Northern Hemisphere sea-level pressure data set. Mon. Wea. Rev.,104,1354–1361.
Zishka, K. M., and P. J. Smith, 1980: The climatology of cyclones and anticyclones over North America and surrounding ocean environs for January and July, 1950–77. Mon. Wea. Rev.,108, 387–401.