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Evidence for infragravity wave-tide resonance in deep oceans

Author

Listed:
  • Hiroko Sugioka

    (Japan Agency for Marine-Earth Science and Technology, Institute for Research on Earth Evolution, 2-15 Natsushima, Yokosuka)

  • Yoshio Fukao

    (Japan Agency for Marine-Earth Science and Technology, Institute for Research on Earth Evolution, 2-15 Natsushima, Yokosuka)

  • Toshihiko Kanazawa

    (Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku)

Abstract

Ocean tides are the oscillatory motions of seawater forced by the gravitational attraction of the Moon and Sun with periods of a half to a day and wavelengths of the semi-Pacific to Pacific scale. Ocean infragravity (IG) waves are sea-surface gravity waves with periods of several minutes and wavelengths of several dozen kilometres. Here we report the first evidence of the resonance between these two ubiquitous phenomena, mutually very different in period and wavelength, in deep oceans. The evidence comes from long-term, large-scale observations with arrays of broadband ocean-bottom seismometers located at depths of more than 4,000 m in the Pacific Ocean. This observational evidence is substantiated by a theoretical argument that IG waves and the tide can resonantly couple and that such coupling occurs over unexpectedly wide areas of the Pacific Ocean. Through this resonant coupling, some of ocean tidal energy is transferred in deep oceans to IG wave energy.

Suggested Citation

  • Hiroko Sugioka & Yoshio Fukao & Toshihiko Kanazawa, 2010. "Evidence for infragravity wave-tide resonance in deep oceans," Nature Communications, Nature, vol. 1(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:1:y:2010:i:1:d:10.1038_ncomms1083
    DOI: 10.1038/ncomms1083
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