November 16, 2011

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

The salinity here would likely be:

A. 35 ppt

B. 34 ppt

C. 36 ppt

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.

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 heatEquator 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

Ocean – Atmosphere Circulation

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