Marine Instruments

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Marine Instruments
Marine Instruments

• Kellam High School Oceanography

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Table of Contents

• Measuring and Collecting Tools
• Nets and Sieves
• ROVs

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Measuring and collecting tools
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gravity core

• The most basic sampling device used to collect
  core samples from the seafloor, it penetrates
  less than 10 meters into the sediment

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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.

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Niskin Bottle, Van Dorn Bottle

• Used to collect water samples from discrete
  depths, which are then chemically analyzed.
• Phosphates, nitrates, and silicates
• Dissolved Oxygen

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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.

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Grab Sampler

• This instrument is used to remove a piece of the
  ocean floor for study

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Hydrometer

• A device used to measure the densities of liquids
  and solutions.

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Secchi Disk

• Used to estimate the transparency of seawater,
  and can provide a relative measure of
  productivity or turbidity.

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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.

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CurrentMeter

• An instrument for measuring the velocity, force,
  etc., of currents.

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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.

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Salinonometer

• A hydrometer that determines the concentration of
  salt solutions by measuring their density

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Refractometer

• An instrument used to measure the salt
  concentration of seawater by using the refraction
  of light.

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Hydrophone

• A microphone for acoustic measurements in fluids.

Hydrophone
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SCUBA

• Self
• Contained
• Underwater
• Breathing
• Apparatus

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Echo Sounding

• The use of a timed sound wave to determine
• the depth of the water

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Global Positioning System (GPS)

• A worldwide radio-navigation system that utilizes
  satellites to triangulate a specific location on
  earth.

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Nets and Sieves
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Dip Net

• Useful for scooping up seaweed, jellyfish, and
  other drifting organisms from docks and the side
  of the vessel.

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Sediment Sieves

• Used to analyze sediment grain size composition.

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Plankton Net

• A cone shaped net of fine mesh material with a
  collecting jar at the base.

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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.

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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.

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Dredge

• This device is dragged across the ocean floor to
  obtain biological or geological samples.
• It can take many shapes either cylindrical or
  boxlike.

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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.

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Crab Pots

• Crab Pots are used for collecting crabs for study
  and food

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ROVs
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ROVS

• Remotely operated underwater vehicles (ROVs) are
  unoccupied, highly maneuverable underwater robots
  operated by a person aboard a surface vessel.

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The End

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