Cable Voltage Measurement using OKITAI and OLU Submarine Cables for Monitoring Ocean Transport

概要

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The OKITAI and OLU submarine cables cross the Kuroshio near the entrance into the East China Sea. They are old type co-axial copper cables and were retired from their commercial service in May 1997. For the scientific reuse of the cables, our cable voltage measurement was restarted in June 1998, after the settlement of the cable end facilities at the cable landing station, to monitor the variability of the ocean transport. This paper mainly describes the OKITAI and OLU cable facilities, the cable voltage measuring system and the cable data processing such as removing the effect of change in the geomagnetic field. Using the measured OKITAI cable voltage of about 3 years and half until the end of the year 2001, we try to estimate the Kuroshio transport crossing over the cable; [Cable estimated transp.(Sv)]= A_0 + A_1 * [Cable voltage(Volt)], where the offset A_0 = 20.87 (Sv, or 10^6m^3s^<-1>) and the conversion factor A_1 = 53.69(Sv/Volt). The long-term variability of the estimated transport is basically consistent with that of the transport estimated by the sealevel difference (Ishigaki-Suao) at the entrance.
琉球大学理学部の論文