Download Marine Instruments Measuring and collecting tools

Marine
Instruments
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
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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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Current
Meter
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 radionavigation system
that utilizes satellites
to triangulate a
specific location on
earth.
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Nets and Sieves
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
ROVS
Remotely operated underwater vehicles (ROVs)
are unoccupied, highly maneuverable
underwater robots operated by a person
aboard a surface vessel.
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