Yasushi Fukamachi

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Three High Frequency (HF) ocean radar stations were installed around the Soya/La Perouse Strait in the Sea of Okhotsk in order to monitor the Soya Warm Current (SWC). The frequency of the HF radar is 13.9 MHz, and the range and azimuth resolutions are 3 km and 5 deg., respectively. The radar covers a range of approximately 70 km from the coast. The surface(More)
To design a method for predicting outbreaks of paralytic shellfish poisoning (PSP) in scallop fishing grounds, the relationship between the distribution of the toxic dinoflagellate Alexandrium tamarense and the dynamics of the Soya Warm Current (SWC) was examined in the Okhotsk Sea off Hokkaido. Surveys were conducted from May to June to clarify the(More)
The Sea of Okhotsk (Fig. 1), a marginal sea adjacent to the North Pacific, is one of the southernmost seasonal sea ice zones in the Northern Hemisphere. The Sea of Okhotsk is connected with the Sea of Japan through the Soya/La Perouse Strait, which is located between Hokkaido, Japan, and Sakhalin, Russia. The Soya Warm Current (SWC) enters the Sea of(More)
The region of the Okhotsk Sea off Hokkaido is known as a “ confluence zone” of cold and fresh water from the northwestern Okhotsk, and warm and saline Soya Warm Water (SWW). These two water masses show strong seasonal variability in this region. In order to study this seasonal variability, a mooring was deployed at (44°32'N, 144°44'E, 1555 m deep) over the(More)
A fourth production region for the globally important Antarctic bottom water has been attributed to dense shelf water formation in the Cape Darnley Polynya, adjoining Prydz Bay in East Antarctica. Here we show new observations from CTD-instrumented elephant seals in 2011-2013 that provide the first complete assessment of dense shelf water formation in Prydz(More)
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