Kellam High School Oceanography Marine Instruments Kellam High School Oceanography Marine Instruments

Table of Contents Measuring and Collecting Tools Nets and Sieves ROVs 11/29/2018

Measuring and collecting tools

gravity core The most basic sampling device used to collect core samples from the seafloor, it penetrates less than 10 meters into the sediment 11/29/2018

Nansen bottles Sub-surface measurements of water samples are made with water sampling bottles. There it is closed by tripping action. When the bottles have been brought back on deck, the water samples are analyzed. 11/29/2018

Niskin Bottle, Van Dorn Bottle Used to collect water samples from discrete depths, which are then chemically analyzed. Phosphates, nitrates, and silicates Dissolved Oxygen 11/29/2018

Shipek Grab Samples a wide variety of ocean and fresh water sediment. The sampler is designed to take samples in soft ooze, clay, sand, gravel and pebbles on flat or gently sloping bottoms. 11/29/2018

Grab Sampler This instrument is used to remove a piece of the ocean floor for study 11/29/2018

Hydrometer A device used to measure the densities of liquids and solutions. 11/29/2018

Secchi Disk Used to estimate the transparency of seawater, and can provide a relative measure of productivity or turbidity. 11/29/2018

Drift bottles The use of drift bottles as a means of charting ocean currents is an old one, and their use in research is not without precedent. 11/29/2018

Current Meter An instrument for measuring the velocity, force, etc., of currents. 11/29/2018

Temperature and depth recorder With this attached to the collecting net, the depth and temperature can be calculated to determine exactly where and at what temperature the fish were collected in the water column. 11/29/2018

Salinonometer A hydrometer that determines the concentration of salt solutions by measuring their density 11/29/2018

Refractometer An instrument used to measure the salt concentration of seawater by using the refraction of light. 11/29/2018

Hydrophone A microphone for acoustic measurements in fluids. 11/29/2018

SCUBA Self Contained Underwater Breathing Apparatus 11/29/2018

Echo Sounding The use of a timed sound wave to determine the depth of the water 11/29/2018

Global Positioning System (GPS) A worldwide radio-navigation system that utilizes satellites to triangulate a specific location on earth. 11/29/2018

Nets and Sieves

Dip Net Useful for scooping up seaweed, jellyfish, and other drifting organisms from docks and the side of the vessel. 11/29/2018

Sediment Sieves Used to analyze sediment grain size composition. 11/29/2018

Plankton Net A cone shaped net of fine mesh material with a collecting jar at the base. 11/29/2018

Phytoplankton nets This fine mesh net collects the smallest plant plankton, which is then easily analyzed under the compound scope for diversity and species composition. 11/29/2018

Neuston Net This new large mesh surface water net enables us to tow for the larger zooplankton (animal plankton), which are readily visible under the dissecting scope. 11/29/2018

Dredge This device is dragged across the ocean floor to obtain biological or geological samples. It can take many shapes either cylindrical or boxlike. 11/29/2018

Trawl Net The mouth of the net is kept open through "otter boards" attached to the leading ends of the net, or, by current passing through the net. 11/29/2018

Crab Pots Crab Pots are used for collecting crabs for study and food 11/29/2018

ROVs

ROVS Remotely operated underwater vehicles (ROVs) are unoccupied, highly maneuverable underwater robots operated by a person aboard a surface vessel. 11/29/2018

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