Dynamical Control of Pacific Oceanic Low-frequency Variability on Western Boundary and Marginal Seas

Details Dynamical Control of Pacific Oceanic Low-frequency Variability on Western Boundary and Marginal Seas Dynamical Control of Pacific Oceanic Low-frequency Variability on Western Boundary and Marginal Seas

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002gapfd..96..201w&link_type=abstract

Geophysical and Astrophysical Fluid Dynamics, vol. 96, Issue 3, p.201-222

Physics

Fluid Dynamics

Scientific paper

The adjustment of sea surface height (SSH) around the coasts of the Japan/East Sea (JES) and the South China Sea (SCS) basins subjected to extratropical Pacific Oceanic low frequency variability is studied using a Kelvin-planetary wave model and a high resolution numerical model. It is found that the modulation of SSH around the coast of Japan is mainly determined by slow adjustment of planetary waves, which radiate from the west coast of Honshu and Hokkaido due to the coastal Kelvin wave. In contrast, the SSH modulation around the cost of the South China Sea basin is mainly determined by the coastal Kelvin wave, which transfers the anomalous SSH into the SCS via the Luzon Strait and out via the Mindoro Strait. The planetary waves radiating from the west coast of Palawan establish a nearly uniform SSH anomaly in the southern part of the SCS, bounded by an eastward jet at the latitude of the Mindoro Strait. Along the western boundary, SSH anomaly decreases almost linearly toward the south, in accordance with the changing local deformation radius. In these two marginal seas, the mean subtropical Pacific gyre circulation enhances SSH modulation induced by extratropical Pacific low frequency variability. Overall, the SSH adjustment in the JES and the SCS predicted by the analytical model agrees well with the numerical model simulation. Application of this model to interaction between these marginal seas and the open ocean is discussed.

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