The Kuroshio Extension: a leading mechanism for the seasonal sea-level variability along the west coast of Japan |
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Authors: | Chao Ma Jiayan Yang Dexing Wu Xiaopei Lin |
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Institution: | (1) College of Physical and Environmental Oceanography, Ocean University of China, Qingdao, 266100, China;(2) Physical Oceanography Laboratory, Ocean University of China, Qingdao, 266100, China;(3) Department of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA |
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Abstract: | Sea level changes coherently along the two coasts of Japan on the seasonal timescale. Archiving, validation, and interpretation
of satellite oceanographic altimetry data and ocean general circulation model for the Earth Simulator results indicate that
the variation propagates clockwise from Japan’s east coast through the Tsushima Strait into the Japan/East Sea (JES) and then
northward along the west coast. In this study, we hypothesize and test numerically that the sea-level variability along the
west coast of Japan is remotely forced by the Kuroshio Extension (KE) off the east coast. Topographic Rossby waves and boundary
Kelvin waves facilitate the connection. Our 3D Princeton Ocean Model when forced by observed wind stress reproduces well the
seasonal changes in the vicinity of JES. Two additional experiments were conducted to examine the relative roles of remote
forcing and local forcing. The sea-level variability inside the JES was dramatically reduced when the Tsushima Strait is blocked
in one experiment. The removal of the local forcing, in another experiment, has little effect on the JES variability. Both
experiments support our hypothesis that the open-ocean forcing, possibly through the KE variability, is the leading forcing
mechanism for sea-level change along the west coast of Japan. |
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