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SeaSoar observations during the Coastal Ocean Advances in Shelf Transport (COAST) mesoscale survey I : R/V Wecoma cruise from 23 May to 13 June 2001 Public Deposited

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  • As part of the Coastal Ocean Processes (CoOP) project Coastal Ocean Advances in Shelf Transport (COAST), this was the first of two cruises in 2001 to study cross-shelf transport processes in a wind-driven coastal ocean. The project includes field experiments off the Oregon coast and coordinated ocean circulation/ecosystem and atmospheric modeling. We made intensive observations primarily to the north of Newport, Oregon, in a region of relatively simple topography. We also sampled in an area to the south of Newport, centered on Heceta Bank (Figure 1). A variety of instruments were used: a towed, undulating vehicle (SeaSoar) to measure temperature, salinity, microstructure (MicroSoar) and phytoplankton fluorescence; a shipboard Acoustic Doppler Current Profiler (ADCP) to measure water velocity; a towed, four-frequency bioacoustics unit (HTI) to detect large zooplankton and larval fish; a multiple net system (MOCNESS) to obtain zooplankton samples; and a surface sampler to obtain clean seawater for determination of its iron content. We worked in close coordination with the R/V Thomas G. Thompson, aboard which other COAST scientists conducted vertical profiling. We towed SeaSoar and the HTI bioacoustics instrument on a grid of east-west sections ranging from 43.75 to 45.25N and from about the 45-m isobath to 60-100 km offshore (Figure 1). This "big box" grid was occupied five times during the cruise, interspersed with three finer scale SeaSoar/ADCP/HTI mapping surveys near the moorings on line 2 (the Cascade Head or "CH" line) and one finer scale mapping centered on line 6 (the Cape Perpetua or "CP" line). Additionally, we had seven repeat sections in a butterfly pattern, centered on the CH line. The R/V Thomas G. Thompson concentrated their sampling along the CH and CP lines.
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