Posted: May 1st, 2022

Lab 4: Water column characteristics

Lab four: Water column characteristics
Thermoclines & haloclines
This lab is replicated from a lab offered at a COSEE workshop by Dr. Alan Shanks.
Title: __________________________________
Targets:
-Perceive how water density causes the vertical stratification of the ocean.
-Perceive thermoclines and haloclines.
-Have the ability to describe ocean conditions that mimic these we’re organising within the lab.
-Discover ways to graph salinity and temperature information.

Experiments:
Your teacher gives you one of many circumstances beneath. Your group will comply with the instructions for that individual situation and observe different teams’ circumstances to reply the questions on the finish of the lab.

Tools:
-a 2-gallon tank
-a siphon tube
-a 5-gallon bucket for water storage
-dyes for coloring the water
-salt, if altering salinity between samples
-a ruler
-aluminum foil and ice
-a Vernier hand-held gadget with both a temperature or salinity probe

Temperature variations:
a. Add heat water to the tank, filling it 1/three full. Coloration the water with dye.
b. Put chilly water in a bucket and dye the water a special shade. Place the siphon tube on the backside of the tank. Slowly add the chilly water into the tank till the tank reaches three/four full. If the colours combine, you added the chilly water too rapidly and might want to start once more. Fastidiously take away the siphon tube, leaving 2 distinct layers of water within the tank. c. Tape a ruler to the tank with the zero line on the water floor.
d. Utilizing the temperature probe, measure the temperature from the highest to the underside in 1 cm. increments. Ensure somebody information the values as you undergo the readings.
e. Make a ship of aluminum and fill it with ice. Place it within the water and observe the currents that come off of the boat.

Salinity variations:
a. Add chilly faucet water to the tank, filling it 1/three full. Coloration the water with dye.
b. Put chilly water in a bucket, add salt to it, and dye the water a special shade. Place the siphon tube on the backside of the tank. Slowly add the chilly water into the tank till the tank reaches three/four full. If the colours combine, you added the chilly water too rapidly and might want to start once more. Fastidiously take away the siphon tube, leaving 2 distinct layers of water within the tank.
c. Tape a ruler to the tank with the zero line on the water floor.
d. Utilizing the salinity probe, measure the salinity from the highest to the underside
in 1 cm. increments. Ensure somebody information the values as you undergo the
readings.
e. Make a ship of aluminum and fill it with ice. Place it within the water and observe the currents that come off of the boat.

Upwelling:
The aim of this experiment is to supply 2 layers of water which might be barely totally different in salinity.
a. Add chilly faucet water to the tank, filling it 1/three full. Coloration the water with dye.
b. Put chilly water in a bucket, add salt to it, and dye the water a special shade. Place the siphon tube on the backside of the tank. Slowly add the chilly water into the tank till the tank reaches three/four full. If the colours combine, you added the chilly water too rapidly and might want to start once more. Fastidiously take away the siphon tube, leaving 2 distinct layers of water within the tank.
c. Tape a ruler to the tank with the zero line on the water floor.
d. Utilizing the salinity probe, measure the salinity from the highest to the underside
in 1 cm. increments. Ensure somebody information the values as you undergo the
readings.
e. Your teacher will use your tank as a demo for upwelling.
All teams will produce a graph utilizing the info they collected. You’ll be able to produce the graph utilizing Excel and print a duplicate to your group or produce the graph utilizing a ruler and graph paper. Every particular person must reply the questions beneath. The group may go collectively, and solutions could also be related, however not an identical.

Lab questions:
1) What’s a thermocline?

2) What’s a halocline?

three) Describe a pure scenario that might end in temperature variations within the ocean.

four) Describe a pure scenario that might end in salinity variations within the ocean.

5) How would upwelling happen within the ocean?

6) Describe the curve you noticed in your graph. Clarify your outcomes.

7) What did you observe when the aluminum boat with ice was added to the water?

eight) Add a drop of meals dye that contrasts the colour of your water onto the floor. What did you observe? Why did it act that method?

9) What did you observe when the fan was used on the floor of the water?

10) Freddy the Fisherman was fishing at a spot close to the mouth of a river. 5 toes down he caught a freshwater perch. His luck was so good that he determined to let loose extra line. At thirty toes he caught a saltwater cod. Freddy is so perplexed by this unusual incidence that he’s going to name the Sports activities Editor of the Submit-Intelligencer. What would you inform Freddy to avoid wasting him from the embarrassment?

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