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Meteorological Research Institute, Japan Meteorological Agency, Japan
Climate and Marine Department, Japan Meteorological Agency, Japan
Climate and Marine Department, Japan Meteorological Agency, Japan
The Japan Meteorological Agency has carried out the WHP observation along the P9 section from Japan to New Guinea coast in the summer of 1994. The P24 section extending from Kyushu Island of Japan has observed in the autumn of 1995. The P24 section is connected with P3 and P9 at 24°N, and re-visit observations were also done there on each sections (P3, P9).
The P9 section runs over the Shikoku and West Mariana Basins, Yap Ridge and Trench, and West Caroline Basin. The highest salinity at bottom was observed in the Yap Trench and West Caroline Basin, where salinity value is close to the one at the gap south of Guam Island, observed by R/V Hakuho Maru in 1987 (Uehara and Taira, 1990). The value of delta-C14 at the bottom of the West Caroline Basin does not show significant difference from that of the southern West Mariana Basin( Mr. M.Ishii, personal communication), supporting the idea that considerable amount of bottom water from the East Mariana Basin flows into the West Caroline Basin as well as into the West Mariana Basin. At mid-depth, a weak silicate maximum is observed at around 2750 m depth between 18° and 14°N, while silicate concentrations are nearly constant below 2000 m depth in the most area of the Philippine Sea. This may suggest a westward mid-depth flow there.
We hope to estimate the flow field which is consistent with the property distributions observed in/around the Philippine Sea. We have a plan to apply inverse techniques for the ADCP and hydrographic data along P9 and P24 sections, and hydrographic data along P3 and P4 sections, with some assumptions on outflows through the Indonesian Islands and Luzon Strait.
We are now making an effort to construct ADCP dataset of P9 cruise. Owing to frequent drops of gyro signal, real-time vector averaging for the process data had been corrupted, and we have to re-generate the whole ADCP dataset from the raw data. We will be able to show the current distribution along the P9 section if our work would be in time for the workshop.
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