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. |
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| 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] |
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| Database: | Engineering Source |
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| 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] |
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| ISSN: | 00223670 |
| DOI: | 10.1175/JPO-D-25-0192.1 |
