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Bottom-Trapped Topographic Rossby Waves Induced by a Warm-Core Ring on the Offshore Slope of a Trench in the Western North Pacific Ocean.

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Title: Bottom-Trapped Topographic Rossby Waves Induced by a Warm-Core Ring on the Offshore Slope of a Trench in the Western North Pacific Ocean.
Authors: Ueno, Takeru1 (AUTHOR) ueno.takeru@s.nenv.k.u-tokyo.ac.jp, Yanagimoto, Daigo1 (AUTHOR), Fujio, Shinzou1 (AUTHOR)
Source: Journal of Physical Oceanography. Mar2026, Vol. 56 Issue 3, p681-694. 14p.
Subjects: Rossby waves, Submarine trenches, Flow measurement, Ocean surface topography, Theory of wave motion
Geographic Terms: North Pacific Ocean
Abstract: We conducted current measurements over a 2-yr period, revealing bottom-trapped topographic Rossby waves (TRWs) on the offshore slope at the southern end of the Kuril Trench in the western North Pacific Ocean. These TRWs were significantly amplified in the 30–70-day period band, characterized by a wavelength of approximately 45 km and eastward (upslope) phase propagation. A ray-tracing analysis suggests that the TRWs were locally excited on the eastern outer rise and propagated energy downslope into the deep trench while decreasing in spatial scale. An analysis of satellite-based sea surface height data reveals that a likely energy source of these waves was an elliptical warm-core ring (WCR), which persisted over the southern Kuril Trench during the period of amplified TRW activity. The elliptical shape of the ring rotated clockwise; this is interpreted as a vortex Rossby wave on a circular WCR. The rotating WCR interacted with a tall seamount, generating cyclonic eddies behind the seamount, thereby amplifying the 30–70-day TRWs over the adjacent trench slope. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Physical Oceanography is the property of American Meteorological Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 192792908
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  Data: Bottom-Trapped Topographic Rossby Waves Induced by a Warm-Core Ring on the Offshore Slope of a Trench in the Western North Pacific Ocean.
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  Data: <searchLink fieldCode="AR" term="%22Ueno%2C+Takeru%22">Ueno, Takeru</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> ueno.takeru@s.nenv.k.u-tokyo.ac.jp</i><br /><searchLink fieldCode="AR" term="%22Yanagimoto%2C+Daigo%22">Yanagimoto, Daigo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Fujio%2C+Shinzou%22">Fujio, Shinzou</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Physical+Oceanography%22">Journal of Physical Oceanography</searchLink>. Mar2026, Vol. 56 Issue 3, p681-694. 14p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Rossby+waves%22">Rossby waves</searchLink><br /><searchLink fieldCode="DE" term="%22Submarine+trenches%22">Submarine trenches</searchLink><br /><searchLink fieldCode="DE" term="%22Flow+measurement%22">Flow measurement</searchLink><br /><searchLink fieldCode="DE" term="%22Ocean+surface+topography%22">Ocean surface topography</searchLink><br /><searchLink fieldCode="DE" term="%22Theory+of+wave+motion%22">Theory of wave motion</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22North+Pacific+Ocean%22">North Pacific Ocean</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: We conducted current measurements over a 2-yr period, revealing bottom-trapped topographic Rossby waves (TRWs) on the offshore slope at the southern end of the Kuril Trench in the western North Pacific Ocean. These TRWs were significantly amplified in the 30–70-day period band, characterized by a wavelength of approximately 45 km and eastward (upslope) phase propagation. A ray-tracing analysis suggests that the TRWs were locally excited on the eastern outer rise and propagated energy downslope into the deep trench while decreasing in spatial scale. An analysis of satellite-based sea surface height data reveals that a likely energy source of these waves was an elliptical warm-core ring (WCR), which persisted over the southern Kuril Trench during the period of amplified TRW activity. The elliptical shape of the ring rotated clockwise; this is interpreted as a vortex Rossby wave on a circular WCR. The rotating WCR interacted with a tall seamount, generating cyclonic eddies behind the seamount, thereby amplifying the 30–70-day TRWs over the adjacent trench slope. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Physical Oceanography is the property of American Meteorological Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1175/JPO-D-25-0192.1
    Languages:
      – Code: eng
        Text: English
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      Pagination:
        PageCount: 14
        StartPage: 681
    Subjects:
      – SubjectFull: Rossby waves
        Type: general
      – SubjectFull: Submarine trenches
        Type: general
      – SubjectFull: Flow measurement
        Type: general
      – SubjectFull: Ocean surface topography
        Type: general
      – SubjectFull: Theory of wave motion
        Type: general
      – SubjectFull: North Pacific Ocean
        Type: general
    Titles:
      – TitleFull: Bottom-Trapped Topographic Rossby Waves Induced by a Warm-Core Ring on the Offshore Slope of a Trench in the Western North Pacific Ocean.
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          Name:
            NameFull: Ueno, Takeru
      – PersonEntity:
          Name:
            NameFull: Yanagimoto, Daigo
      – PersonEntity:
          Name:
            NameFull: Fujio, Shinzou
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          Dates:
            – D: 01
              M: 03
              Text: Mar2026
              Type: published
              Y: 2026
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              Value: 56
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            – TitleFull: Journal of Physical Oceanography
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