| Oceanographic Survey of Cross Seamount and Control Sites (OES0703L1, EK60) |
| The goals of the cruise were to collect acoustic backscatter and oceanographic data
at Cross Seamount (18°43.285? N, longitude 158° 15.710? W), with an approximately
400 m deep plateau, and at control sites in the surrounding environment. Data collected
consisted of CTD casts, trawl samples, and continuous monitoring of currents and biological
acoustic backscatter. CTD cats were conducted at predetermined stations. CTDs were
equipped with oxygen sensors and fluorometers, and water was sampled at discrete depths
during each cast for chloropigment determinations. Trawl operations were conducted
at predetermined stations using a Cobb trawl at depths of the shallow (nighttime)
and deep (day and nighttime) sound scattering layers. Currents were continuously monitored
using a RD Instruments Acoustic Doppler Current Profiler (ADCP) operating at 75 kHz
frequency. Biological backscatter were recorded using the EK60 echosounder system
(38, & 120 kHz) along predetermined transects. |
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