lab one
pdf
School
University of California, Santa Cruz *
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Course
100
Subject
Geography
Date
Apr 3, 2024
Type
Pages
4
Uploaded by BarristerWombatMaster1020
OCEA-80A Lab Assignment 1: Intro to the ocean
Week 2
40 Points
Seawater density
Objective
: To observe the effects of water temperature and salinity on density.
Background:
The density of seawater varies from place to place in the ocean, depending on
evaporation and rainfall rates, river runoff, and water temperature. The density of the water in
which marine organisms live influences several aspects of their lives, such as the flotation of
planktonic forms. In addition, sinking masses of higher-density seawater carry oxygen-rich
waters from the surface to greater depths, as less-dense nutrient-rich water moves upward.
Finally, sinking of high-density cold seawater in the north Atlantic and in the Antarctic drives the
global circulation of water throughout the world's ocean basins—this is called
thermohaline
circulation
.
Online simulation:
Follow this link to access the Density of Liquids simulation tool. The
beakers in the left panel are filled with hot, cold, and room temperature freshwater. The purple
beaker is filled with saltwater. The balloons in the right panel are filled with hot and cold
freshwater, or room temperature saltwater.
1.
The green beaker in the center of the screen is filled with room temperature freshwater.
Click and drag the balloon filled with saltwater into the center of the freshwater beaker.
What happens to the balloon and why?
5 points
2.
Click on the blue “cold water” beaker, the blue beaker should replace the green room
temperature beaker in the center of the screen. Next, click and drag the balloon filled
with hot water and the balloon filled with cold water into the cold water beaker. Place the
balloons in the middle of the beaker. What happens to the balloons and why?
5 points
3.
Drag the balloons back to the right panel and click on the “hot water” beaker. The red
beaker should replace the blue cold water beaker in the center of the screen. Next, click
and drag the balloon filled with hot water and the balloon filled with cold water into the
hot water beaker. Place the balloons in the middle of the beaker. What happens to the
balloons and why?
5 points
4.
Drag the balloons back to the right panel and click on the “salt water” beaker. The purple
beaker should replace the red hot water beaker in the center of the screen. Next, click
and drag the balloon filled with hot water and the balloon filled with cold water into the
salt water beaker. Place the balloons in the middle of the beaker. What happens to the
balloons and why?
5 points
5.
Fill in the missing chart values using the Temperature-Density plot. Salinity is plotted
on the x-axis of the chart, and density (g/cm
3
) is plotted on the y-axis. Each line in the
chart represents a different water temperature from 10 to 30 degrees Celsius. Use the
chart to find the unknown value, following the two known values. For example,
seawater that has a density of 1.0225 g/cm
3
at 30 degrees C has a salinity of 34 ‰.
12 points
Salinity (‰)
Temperature (°C)
Density (g/cm
3
)
24
30
2
1.0025
18
1.0175
26
15
30
1.0075
20
1.0150
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6.
Study the Temperature-Density plot above to answer the following two questions.
a.
Does seawater density increase or decrease with increasing temperature?
4
points
b.
Does seawater density increase or decrease with increasing salinity?
4 points