OCEANS AND THE SEA Or: Water, water everywhere, nor any drop to drink…
Jan 01, 2016
HOW MUCH WATER IS THERE?
http://www.youtube.com/watch?v=jKOmNGEi0DY
http://www.youtube.com/watch?v=AxF-PdnecXw
HOW MUCH WATER IS THERE?
332,500,000 cubic miles all told. That’s a sphere 860 miles in diameter (USGS)
CREATING A WATER BUDGET
In the next several slides we will create what is known as a water budget. This will help us account for all of the water on Earth.
WATER BUDGET
Create a “T” chart on the page in your notes. It will need to be about 9-10 lines tall and full width on your page.
WATER BUDGET
Location Percentage
Oceans 96.5%Saline lakes and g.w. About 1%Fresh water 2.5%Numbers below are % of the fresh water. Glaciers and Ice Caps about 68% Lakes and rivers about .5 % Ground Water about 30% Soil moisture about .005% Atmosphere about .0001% Plants and Animals about .0001%
WHAT MAKES SEAWATER… WELL… SEAWATER?
Seawater is salty. This property is known as SALINITY.
The amount of dissolved solids in seawater. Expressed in parts per thousand
RULE OF CONSTANT COMPOSITION
This states that the major components of salt in the Oceans are the same all over the world
Do not be tempted to think that this means all seawater is equally salty across the globe.
6 CONSTANT COMPOSITION COMPONENTS
Chloride- Cl- 19.10g/1000g seawater Sodium- Na+ 10.62 g/1000g seawater Sulfate- SO4
-2 2.66 g/1000g seawater Magnesium- Mg+2 1.28 g/1000g seawater Calcium- Ca+2 0.40 g/1000g seawater Potassium- K+ 0.38 g/1000g seawater
WHAT ELSE IS DISSOLVED IN THE OCEAN?
Gasses Oxygen and Nitrogen- the main gasses in
seawater Carbon Dioxide- while not a major component of
the atmosphere, there is a large amount of it in seawater.
CARBON DIOXIDE AND THE OCEAN
The ocean holds about 60% more Carbon Dioxide than the atmosphere
This means the ocean is a Carbon Sink Capture and holds extra carbon dioxide
Since this gas traps and holds heat from the Sun, the ocean is important in helping to maintain Earth’s temperature
FACTORS THAT CHANGE THINGS
Warmer Temperatures Less gas, more solids Lower dissolved gas, higher salinity
Cooler Temperatures More gas dissolved, less solids Higher dissolved gas, lower salinity
Precipitation More precipitation means lower salinity
WHERE DOES SALINITY COME FROM?
The salt in the ocean was once part of a rock. These minerals weather out of the rocks and
are carried to the sea.
http://www.youtube.com/watch?v=iSJggIWlH9w
OCEAN TEMPERATURE
The ocean has layers with different temperatures
The layer where the temperature changes fastest is the Thermocline