72
averaged wind vectors which has been observed at Muroran Meteorological
Observatory (Fig. 6). In winter season, northwest direction is dominant component in
this region as shown in Fig. 6. Both wind and surface current intend to vary
simultaneously. After wind direction changed from northwesterly to southeasterly,
surface current also changed from eastward to westward. However, this phenomena
continue only for two - four days These events is coincidence the intrusion of Coastal
Oyashio water to the Bay. We consider the change of wind southeasterly is an important
parameter to the intrusion process of Coastal Oyashio water. The intrusion process of
Coastal Oyashio water might not be continuously but intermittently.
Acknowledgments
We acknowledge useful support on temporally offering of HF radar site from Sawara
Town Hall, Minami-Kayabe Town Hall, and Kinaoshi Fisheries Union. Satellite data
relevant to this study were supplied by the Japan Weather Association. Hokkaido
Newspaper Co. LTD. kindly provided a fund for promoting of this study.
References
Akiyama, H., Y. Ohno and S. Saitoh: Kuroshio warm filament passing around the
Tokara Strait, Umi to Sora, 68(3), 99-112, 1992(in Japanese with English abstract).
Matthews, J. P., A. D. Fox and D. Prandle: Radar observation of n along-front jet and
transverse flow convergence associated with a North Sea front, Continental Shelf
Research, 13(1), 109-130, 1993.
Ohno, Y., Y. Hisaki, A. Nadai, H. Kuroiwa and M. Tokuda: Analysis of ocean current
obtained by two-site HF ocean radar, Proc. PORSEC, Vol.3, 1161-1163, 1993.
Saitoh, S. : AVHRR on NOAA, in Eds. by M. Ikeda and F. Dobson "Oceanographic
Application of Remote Sensing", CRC Press, 407-417.