![]() ![]() The largest multiple opening-closing variety consists of a great metal frame carrying as many as 20 nets and an environmental sensing array that sends information back to the ship's laboratory, where biologists signal the nets to open in sequence as they observe temperature, depth, salinity, and other characteristics of the water column. The smaller ones, perhaps a meter long, may be towed briefly in near-surface waters. Some of the tools oceanographers employ are described here.Ĭollecting nets come in a wide array of sizes. At the same time, they must be very precise. They must mesh with ships' winches and cranes and be of a size and weight manageable on the wet, unsteady, windswept deck of a research vessel. Oceanographic tools must carry out their missions in corrosive seawater and under high pressure in the deep sea. Another approach is to create instruments or even automated laboratories to operate autonomously on the seafloor or in the water column. Since the ocean itself is not a convenient place to conduct research, scientists collect samples of water, sediment, flora, and fauna for study in laboratories aboard ship or ashore. ![]()
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