November 16, 2011

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# November 16, 2011 - PowerPoint PPT Presentation

November 16, 2011. Objective: Learn how ocean currents move heat around the Earth. Agenda: Textbook pages 519-524 answer questions 1-6 Ocean Notes continued Ocean Current Worksheet Review for Test Homework: All work is due tomorrow for 2 nd MP Test Tomorrow… STUDY!. Salinity.

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Presentation Transcript
Objective:
• Learn how ocean currents move heat around the Earth
• Agenda:
• Textbook pages 519-524 answer questions 1-6
• Ocean Notes continued
• Ocean Current Worksheet
• Review for Test
• Homework:
• All work is due tomorrow for 2nd MP
• Test Tomorrow… STUDY!
Salinity

The amount of salt per unit water is known as salinity.

NaCl

The most abundant salt in seawater is ________, but there are many other salts present in the form of ions.

The average salinity of seawater is _____ ppt. Therefore, for every 1,000 ml water, there are ___ grams of dissolved salts.

35

35

Near the equator salinity is __________ than average due to ___________________.

lower

greater precipitation

lower

Near the poles salinity is __________ than average due to _______________.

melting sea ice

higher

In the Mediterranean the salinity is __________than average due to __________.

evaporation

Ocean Salinity
• http://www.ldeo.columbia.edu/dees/ees/climate/slides/sal_march.gif
• http://ingrid.ldgo.columbia.edu/
Colorful Seawater
• What 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.

Label the three ocean layers in the diagram below.

Surface layer

Thermocline

Bottom layer

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 heat
• Equator to poles
• Transport nutrients and organisms
• Influences weather and climate
• Influences commerce
Sea Surface Temperature

http://www.ldeo.columbia.edu/dees/ees/climate/slides/sst_march.gif

Chapter Review
• What is the average salinity of seawater?
• What is the deepest area of the seafloor?
• What is the largest ocean?
• Why is the ocean “blue”?
• What is the force responsible for surface currents?
• What causes density currents?
• Name the ocean that borders Virginia.

35 ppt

trench

Pacific

shorter wavelengths not absorbed

wind

differences in temperature and salinity

Atlantic