MSC1270 Name: Temperature-Salinity-Density Relationships in Seawater Introduction: The density of seawater is a factor of BOTH salinity and temperature. Salinity and temperature of seawater can vary both geographically and vertically. 1. What happens to the density of seawater as the temperature increases?_ 2. What happens to the density of seawater as the salinity increases?_ 3. What happens to the density of seawater as the temperature increases AND the salinity increases? Is there one right answer to this question?

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MSC1270
Temperature-Salinity-Density Relationships in Seawater
Introduction: The density of seawater is a factor of BOTH salinity and temperature. Salinity and
temperature of seawater can vary both geographically and vertically.
1. What happens to the density of seawater as the temperature increases?
2. What happens to the density of seawater as the salinity increases?
3. What happens to the density of seawater as the temperature increases AND the salinity increases? Is
there one right answer to this question?
The following figure shows the relationship between seawater salinity, temperature, and density.
One thing we can interpret from this figure is that two different samples of seawater with different
salinities and temperatures can have the SAME density (points A and B). Convince yourself that this is
true by studying the diagram.
4. A sample of seawater with a
salinity of 35.8 psu and a density of
1.0264 g/cm³ will be at what
temperature?
5. What is the density of a sample of
seawater with a salinity of 34.4 psu
at a temperature of 5 degrees C?
Temperature (°C)
20
15
10
0
33.5
Name:
1,0245
Temperature-Salinity Diagram
(lines of equal density in g/cm^3)
1.0250
34.0
1.0255
1.0260
34.5
1.0265
1.0270
1.0275 B
35.0
Salinity (PSU)
6. What is the salinity of a sample of
seawater at 15 degrees C that has the same density as the sample in #5 above?
1.0280
........
35.5
1.0285
36.0
1.0290
L
36.5
February 15, 2023 4:26 PM
Transcribed Image Text:MSC1270 Temperature-Salinity-Density Relationships in Seawater Introduction: The density of seawater is a factor of BOTH salinity and temperature. Salinity and temperature of seawater can vary both geographically and vertically. 1. What happens to the density of seawater as the temperature increases? 2. What happens to the density of seawater as the salinity increases? 3. What happens to the density of seawater as the temperature increases AND the salinity increases? Is there one right answer to this question? The following figure shows the relationship between seawater salinity, temperature, and density. One thing we can interpret from this figure is that two different samples of seawater with different salinities and temperatures can have the SAME density (points A and B). Convince yourself that this is true by studying the diagram. 4. A sample of seawater with a salinity of 35.8 psu and a density of 1.0264 g/cm³ will be at what temperature? 5. What is the density of a sample of seawater with a salinity of 34.4 psu at a temperature of 5 degrees C? Temperature (°C) 20 15 10 0 33.5 Name: 1,0245 Temperature-Salinity Diagram (lines of equal density in g/cm^3) 1.0250 34.0 1.0255 1.0260 34.5 1.0265 1.0270 1.0275 B 35.0 Salinity (PSU) 6. What is the salinity of a sample of seawater at 15 degrees C that has the same density as the sample in #5 above? 1.0280 ........ 35.5 1.0285 36.0 1.0290 L 36.5 February 15, 2023 4:26 PM
MSC1270
Name:
7. Consider a vertical column of water in the ocean. Is it possible for the water near the bottom of the
column to have a salinity of 34.0 psu and a temperature of 5 degrees C, while the water at the top of the
column has a salinity of 35.0 psu and a temperature of 2.0 degrees C? Why or why not?
8. Consider a vertical column of water in the ocean. Is it possible for the water near the bottom of the
column to have a salinity of 34.0 psu and a temperature of 5 degrees C, while the water at the top of the
column has a salinity of 35.0 psu and a temperature of 16 degrees C? Why or why not?
February 15, 2023 4:27 PM
Transcribed Image Text:MSC1270 Name: 7. Consider a vertical column of water in the ocean. Is it possible for the water near the bottom of the column to have a salinity of 34.0 psu and a temperature of 5 degrees C, while the water at the top of the column has a salinity of 35.0 psu and a temperature of 2.0 degrees C? Why or why not? 8. Consider a vertical column of water in the ocean. Is it possible for the water near the bottom of the column to have a salinity of 34.0 psu and a temperature of 5 degrees C, while the water at the top of the column has a salinity of 35.0 psu and a temperature of 16 degrees C? Why or why not? February 15, 2023 4:27 PM
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