What is it about?

The Western Isoguchi Jet is a unique quasi-stationary jet along the Subarctic Front in the North Pacific Ocean. The dynamics of the were investigated using an idealized two-layer model.

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Why is it important?

A seafloor topography, which is merely 500m high, produces a surface jet with an eddy-induced anticyclonic barotropic over the topography.


An understanding of the dynamics of the Jet could also be important for air–sea interactions through the SST front. It is known that part of the Subarctic Front is quasi-stationary (Sugimoto et al. 2014) while the movement of the Subarctic Front induces anomalous atmospheric circulations in the Northern Hemisphere spanning from the western Pacific to North America and even to western Europe (Frankignoul et al. 2011). The dynamics proposed in this study explain the reason for this quasi-stationary behavior. Therefore, this study suggests the importance of the low-rise bottom topography in controlling the SST front. While the location is quasi-stationary, the strength of the Western Isoguchi Jet and the associated SST front varies interannually (Isoguchi et al. 2006; Sugimoto et al. 2014; Wagawa et al. 2014). Mitsudera et al. (2018) showed that frontal-scale SST variations in the western subarctic Pacific depend significantly on the strength of the warm quasistationary jet.

Japan Agency for Marine-Earth Science and Technology

Read the Original

This page is a summary of: Dynamics of a Quasi-Stationary Jet along the Subarctic Front in the North Pacific Ocean (the Western Isoguchi Jet): An Ideal Two-Layer Model, Journal of Physical Oceanography, April 2018, American Meteorological Society,
DOI: 10.1175/jpo-d-17-0086.1.
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