Influence of Current Width Variation on the Annual Mean Transport of the East Sakhalin Current: A Simple Model |
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Authors: | Email author" target="_blank">Yoichi?ShimadaEmail author Atsushi?Kubokawa Kay?I?Ohshima |
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Institution: | (1) Graduate School of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan;(2) Institute of Low Temperature Science, Hokkaido University, Sapporo 060-0819, Japan |
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Abstract: | Recent observations suggest that the annual mean southward transport of the East Sakhalin Current (ESC) is significantly larger
than the annual mean Sverdrup transport. Motivated by this observational result, transport of a western boundary current has
been investigated using a simple numerical model with a western slope. This transport is defined as the instantaneous barotropic
transport integrated from the western boundary to the offshore point where the barotropic velocity vanishes. The model, forced
by seasonally varying wind stress, exhibits an annual mean of the western boundary current transport that is larger than that
of the Sverdrup transport, as observed. The southward transport from October to March in the model nearly equals the instantaneous
Sverdrup transport, while the southward transport from April to September decreases slowly. Although the Sverdrup transport
in July vanishes, the southward transport in summer nearly maintains the annual mean Sverdrup transport, because the barotropic
Rossby wave cannot intrude on the western slope. This summer transport causes the larger annual mean. Although there are some
uncertainties in the estimation of the Sverdrup transport in the Sea of Okhotsk, the seasonal variation of the southward transport
in the model is qualitatively similar to the observations. |
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Keywords: | Bottom topography East Sakhalin Current seasonal variation Sverdrup transport western boundary current wind-driven ocean circulation |
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