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Acoustic Doppler current profiler observations during the coastal jet separation project on R/V Wecoma, 17-27 August 1995

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  • We present velocity observations from a shipboard acoustic doppler current profiler (ADCP) on RN Wecoma during cruise W9508b, 17-27 August 1995. Results from the short half-day cruise W9508c on 31 August 1995 are also shown. The ADCP processing procedures for W9508b are described in detail. This cruise was part of the Coastal Jet Separation project. funded by the Na­tional Science Foundation, to study how and why a strong alongshore coastal current turns off­shore, crosses steep bottom topography, and becomes an oceanic jet. The focus of the cruise was a series of high-resolution SeaSoar (CID) and ADCP surveys across the continental margin upstream and downstream of Cape Blanco, Oregon (43°N). The ADCP was an RD Instruments hull-mounted 153.6 kHz unit. Data were collected continuously during the 10 day period of W9508b, in a region extending about 200 km along the coast and 75 km offshore. Vertica1 bin length was 8 m and the typicaJ depth range in open water was 18-350 m. To reference the ve­locities to earth coordinates, we used wide-area differential global positioning system naviga­tion, supplemented by bottom-tracking where possible.
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