1. Friday, January 19, 2018
(Discussion – Ocean Temperature and Density; Continue Discovery Education Unit - Studying the Hydrosphere, Concept - Ocean Water)

2. The Launch Pad water temperature water density 1/1 Friday, 1/19/18
Other than salinity, name two other properties of seawater that can vary from place-to-place in Earth’s oceans.
water temperature
water density

3. We will take Quiz 10 next Friday!
Announcements
We will take Quiz 10 next Friday!

4. Summative or Formative #
Assignment
Summative or Formative #
Date Issued
Gone Missing Day
Last Day Accepted

5. Ocean Temperature
Surface water temperature varies with the amount of solar radiation received.
Lower surface temperatures are found in high-latitude regions.
Higher surface temperatures are found in low-latitude regions.
The unique thermal properties of seawater make it resistant to temperature changes.
However, global warming could eventually influence ocean temperatures.

6. Ocean Temperature Variation with Depth
In low latitudes, there is a high temperature at the surface, with a rapid decrease in temperature with depth. This indicates the presence of a thermocline.
In high latitudes, there are cooler surface temperatures with no rapid change in temperature with depth.

7. Variations in the Ocean’s Surface Temperature and Salinity with Latitude
Figure 14.3

8. Ocean Density Factors affecting seawater density:
Density is the amount of mass a material contains in a given volume of space.
Density determines the water’s vertical position in the ocean.
Factors affecting seawater density:
temperature (the greatest influence)
salinity

9. Ocean Density Variations with Depth
In low latitudes, there is low density at the surface, with the density increasing rapidly with depth because of colder water. This indicates the presence of a pycnocline.
In high latitudes, we find high-density (cold) water at the surface with little change in density with depth.

10. Ocean “Layering” Due to Density
The oceans have a three-layered structure according to density.
The Surface Mixed Zone is warmed by the Sun and extends to a depth of 300 meters.
The Transition Zone lies under the surface mixed zone and is where the thermocline and pycnocline are found, if present.
The Deep Zone in under the transition zone when where sunlight never reaches. Temperatures here are just a few degrees above freezing, and the water density is constantly high.

11. About one-third of the carbon dioxide gas induced into the atmosphere by humans ends up in the oceans. This results in ocean water gradually becoming more acidic. This is threatening a variety of organisms, including food-chain microbes and corals.

12. Continue Discovery Education Unit
Unit: Studying the Hydrosphere
Concept: Ocean Water
Go to and login.
Scroll down to the bottom of your homepage and click on the “Science Techbook” link.
Find the Unit titled “Studying the Hydrosphere” and click on it.
Choose the Concept titled “Ocean Water.”
Begin reading, watching the videos, and doing the activities.
When you reach the bottom of the page, click the NEXT button and proceed through the Concept.