Transport of Oyashio Water across the Subarctic Front into the Mixed Water Region and Formation of NPIW |
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| Authors: | Masachika Masujima Ichiro Yasuda Yutaka Hiroe Tomowo Watanabe |
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| Institution: | (1) Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;(2) Fisheries Research Agency, National Research Institute of Fisheries Science, Fukuura, Kanazawa-ku, Yokohama, Kanagawa 236-8648, Japan |
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| Abstract: | Oyashio water flowing into the Mixed Water Region (MWR) and the Kuroshio Extension region that forms North Pacific Intermediate
Water (NPIW) has been examined, based on four Conductivity-Temperature-Depth profiler (CTD)/Lowered Acoustic Doppler Current
Profiler (L-ADCP) surveys of water masses and ocean currents. There are two processes by which the Oyashio water intrudes
across the Subarctic Front (SAF): one is a direct cross-nearshore-SAF transport near Hokkaido along the western boundary,
and the other is a cross-offshore-SAF process. Seasonal variations were observed in the former process, and the transport
of the Oyashio water across SAF near Hokkaido in the density range of 26.6–27.4σθ was 5–10 Sv in spring 1998 and 2001, and 0–4 Sv in autumn 2000, mainly corresponding to the change of the southwestward Oyashio
transport. Through the latter process, 5–6 Sv of the Oyashio water was entrained across the offshore SAF from south of Hokkaido
to 150° in both spring 2001 and autumn 2000. The total cross-SAF Oyashio water transport contributing to NPIW formation is
more than 10 Sv, which is larger than previously reported values. Most of the Oyashio water formed through the former process
was transported southeastward through the Kuroshio Extension. It is suggested that the Oyashio intrusion via the latter process
feeds NPIW in the northern part of the MWR, mainly along the Subarctic Boundary and SAF.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | Oyashio Mixed Water Region Subarctic Front L-ADCP CTD NPIW |
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