1. Marine Instruments Measuring and collecting tools, nets and sieves, and ROVS, AUVs, and manned submersibles; Edited from: Kellam High School Oceanography

2. Measuring and collecting tools

3. 01/27/153 gravity core The most basic sampling device used to collect core samples from the seafloor, it penetrates less than 10 meters into the sediment

4. 01/27/154 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.

5. 01/27/155 Niskin Bottle, Van Dorn Bottle Used to collect water samples from discrete depths, which are then chemically analyzed. Phosphates, nitrates, and silicates Dissolved Oxygen

6. 01/27/156 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.

7. 01/27/157 Grab Sampler This instrument is used to remove a piece of the ocean floor for study

8. 01/27/158 Hydrometer A device used to measure the densities of liquids and solutions.

9. 01/27/159 Secchi Disk Used to estimate the transparency of seawater, and can provide a relative measure of productivity or turbidity.

10. 01/27/1510 Temperature and depth recorder: CTD With this attached to the collecting net, the depth and temperature can be calculated to make a profile of the water column. CTD = Conductivity, Temperature, Depth

11. 01/27/1511 Current Meter An instrument for measuring the velocity, force, etc., of currents. Ex: ADCP, Acoustic Doppler Current Profiler

12. 01/27/1512 Salinonometer A hydrometer that determines the concentration of salt solutions by measuring their density

13. 01/27/1513 Refractometer An instrument used to measure the salt concentration of seawater by using the refraction of light.

14. 01/27/1514 Hydrophone A microphone for acoustic measurements in fluids. Hydrophone

15. 01/27/1515 SCUBA Self Contained Underwater Breathing Apparatus

16. 01/27/1516 Echo Sounding The use of a timed sound wave to determine the depth of the water

17. 01/27/1517 Global Positioning System (GPS) A worldwide radio- navigation system that utilizes satellites to triangulate a specific location on earth.

18. Nets and Sieves

19. 01/27/1519 Dip Net Useful for scooping up seaweed, jellyfish, and other drifting organisms from docks and the side of the vessel.

20. 01/27/1520 Sediment Sieves Used to analyze sediment grain size composition.

21. 01/27/1521 Plankton Net A cone shaped net of fine mesh material with a collecting jar at the base.

22. 01/27/1522 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.

23. 01/27/1523 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.

24. 01/27/1524 Dredge This device is dragged across the ocean floor to obtain biological or geological samples. It can take many shapes either cylindrical or boxlike.

25. 01/27/1525 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.

26. 01/27/1526 Crab Pots Crab Pots are used for collecting crabs for study and food

27. ROVs, AUVs, and manned submersibles

28. 01/27/1528 ROVS Remotely operated underwater vehicles (ROVs) are unoccupied, highly maneuverable underwater robots operated by a person aboard a surface vessel.

29. 01/27/1529 AUVS Autonomous underwater vehicles (AUVs) are unoccupied, highly maneuverable underwater robots pre-programmed that fly for long amounts of time collecting data and submit it via satellite when they surface.

30. 01/27/1530 Manned Submersibles Manned submersibles are vehicles that are piloted with someone on board the vehicle. Examples include Alvin and the Johnson Sea Link