Complex North Atlantic Oscillation (NAO) index signal of historic North Atlantic storm-track changes

A. G. Dawson (Lead / Corresponding author), K. Hickey, T. Holt, L. Elliott, S. Dawson, I. D. L. Foster, P. Wadhams, I. Jonsdottir, J. Wilkinson, J. McKenna, N. R. Davis, D. E. Smith

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Abstract

Previous reports have suggested a link between increased storminess in the North Atlantic during recent years with a period of time during which the North Atlantic Oscillation Index has been strongly positive. New analyses of late nineteenth-century gale-day data for meteorological stations in northern Scotland and western Ireland indicate that the relatively high storminess that characterized this period was associated with monthly NAO Index values that rarely exceeded +2 and, on several occasions, were strongly negative. It is speculated that this difference may reflect the influence of an expanded sea-ice cover in the Greenland Sea that caused a considerable southward displacement of the North Atlantic storm track during the late nineteenth century. Such changes imply that the polar atmospheric and oceanic fronts in the North Atlantic were displaced southward during the late nineteenth century.

Original languageEnglish
Pages (from-to)363-369
Number of pages7
JournalHolocene
Volume12
Issue number3
DOIs
Publication statusPublished - 1 Apr 2002

Keywords

  • Climatic change
  • Gale days
  • Historic storms
  • Historical evidence
  • NAO Index
  • North Atlantic Oscillation
  • Sea ice

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    Dawson, A. G., Hickey, K., Holt, T., Elliott, L., Dawson, S., Foster, I. D. L., Wadhams, P., Jonsdottir, I., Wilkinson, J., McKenna, J., Davis, N. R., & Smith, D. E. (2002). Complex North Atlantic Oscillation (NAO) index signal of historic North Atlantic storm-track changes. Holocene, 12(3), 363-369. https://doi.org/10.1191/0959683602hl552rr