A Reexamination of the Northern Hemisphere Sea Level Pressure Variability by the Independent Component Analysis

DOI Web Site 被引用文献5件 参考文献17件
  • Mori Atsushi
    Department of Astronomy and Earth Sciences, Tokyo Gakugei University
  • Kawasaki Nobuaki
    Senior High School at Otsuka of Tsukuba University
  • Yamazaki Kensuke
    Department of Technology and Information Science, Tokyo Gakugei University
  • Honda Meiji
    Frontier Research Center for Global Change, Japan Agency for Marine-Earth Science and Technology Center
  • Nakamura Hisashi
    Frontier Research Center for Global Change, Japan Agency for Marine-Earth Science and Technology Center Department of Earth and Planetary Science, the University of Tokyo

抄録

The results of the empirical orthogonal function (EOF) analysis applied to the sea-level pressure (SLP) variability in the extratropical Northern Hemisphere is reexamined from viewpoint of statistical independence. For this purpose, “Independent Component Analysis” is introduced, whose effectiveness is demonstrated in its application to a set of simple hypothetical models. While its application to stratospheric variability confirms the relevance of the EOF analysis, its application to the SLP suggests that the two leading components of the EOF analysis are likely superpositions of two statistically independent signals. One of them represents a seesaw-like relationship in the intensities between the surface Aleutian and Icelandic lows, and the other is characterized by a significant long-term trend with the cold ocean-warm land pattern.

収録刊行物

  • SOLA

    SOLA 2 5-8, 2006

    公益社団法人 日本気象学会

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