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Acoustic Doppler current profiler observations during the coastal jet separation project on R/V Wecoma, August 23 to September 2, 1994

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  • We present velocity observations from a shipborne acoustic Doppler current profiler (ADCP) on RIV Wecoma during cruise W9408A, August 23 to September 2, 1994. The ADCP processing procedures 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 off shore, crosses steep bottom topography, and becomes an oceanic jet. The focus of the cruise was a series of high-resolution SeaSoar (CTD) 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 nearly continuously for the 10 day period, in a region extending about 200 km along the coast and 100 km offshore. Vertical bin length was 8 m and the typical depth range in open water was 20-400 m. To reference the ADCP velocities, we used conventional global posi­tioning system (GPS) navigation, supplemented by bottom-tracking where possible.
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