Objective:Learn how ocean
currents move heat around the Earth
Agenda:Textbook pages 519-524
answer questions 1-6Ocean Notes continuedOcean Current
WorksheetReview for Test
Homework:All work is due tomorrow
for 2nd MPTest Tomorrow… STUDY!
SalinityThe amount of salt per unit water is known as
salinity.
The average salinity of seawater is _____ ppt. Therefore, for every 1,000 ml water, there are ___ grams of dissolved salts.
The most abundant salt in seawater is ________, but there are many other salts present in the form of ions.
Near the equator salinity is __________ than average due to ___________________.
Near the poles salinity is __________ than average due to _______________.
In the Mediterranean the salinity is __________than average due to __________.
NaCl
3535
lowergreater precipitation lowermelting sea ice higher
evaporation
Ocean Salinity
http://www.ldeo.columbia.edu/dees/ees/climate/slides/sal_march.gif•http://ingrid.ldgo.columbia.edu/
Colorful SeawaterWhat makes the ocean
water in the picture to the left different colors?
Why would a shrimp that appears bright red at the surface appear black at greater depths, and why might this be beneficial?
differences in depth
Longer (red) wavelengths are absorbed before reaching deep water. Shrimp can hide and not become a meal.
Listed below are some of the major surface currents. The force which generates these currents is ____________.
wind
Why is Ocean Circulation Important?
Transport ~ 20% of latitudinal heatEquator to poles
Transport nutrients and organisms
Influences weather and climate
Influences commerce
Chapter Review1. What is the average salinity of seawater?
2. What is the deepest area of the seafloor?
3. What is the largest ocean?
4. Why is the ocean “blue”?
5. What is the force responsible for surface currents?
6. What causes density currents?
7. Name the ocean that borders Virginia.
35 ppttrench
Pacific
shorter wavelengths not absorbed
wind
differences in temperature and salinity
Atlantic
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