Long-term variability of winter mixed layer depth and temperature along the Kuroshio jet in a high-resolution ocean general circulation model |
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| Authors: | Haruka Nishikawa Ichiro Yasuda |
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| Institution: | (1) Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa Chiba, 277-8568, Japan |
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| Abstract: | To explore the causes of the winter shallow mixed layer and high sea surface temperature (SST) along the strong Kuroshio jet
from the East China Sea to the upstream Kuroshio extension (25.5°N–150°E) during 1988–1994 when the Japanese sardine stocks
collapsed, high-resolution ocean general circulation model (OGCM) hindcast data are analyzed with a bulk mixed layer model
which traces particles at the mixed layer base. The shallow mixed layer and high SST along the Kuroshio jet are mainly caused
by the acceleration of the Kuroshio current velocity and the reduction of the surface cooling. Because the acceleration reduces
the time during which the mixed layer is exposed to wintertime cooling, deepening and cooling of the winter mixed layer are
restricted. The weaker surface cooling due to less severe meteorological forcing also causes the shallow mixed layer and the
high SST. The impact of the strong heat transport along the Kuroshio extends to the southern recirculation gyre of the Kuroshio/Kuroshio
extension regions; previous indications that the Japanese sardine recruitment is correlated with the winter SST and the mixed
layer depth (MLD) in the Kuroshio extension recirculation region could be related to the velocity, SST, and MLD near the Kuroshio
axis which also could affect the variability of North Pacific subtropical water. |
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