Ocean+Currens-Density+by+Jamie+and+Gareth

=__What is an Ocean Current?__= = =
 * Ocean currents is the steady flow of surface ocean water in a prevailing direction
 * Ocean currents vary from hot to cold current
 * The diragram below shows how and where each cold or hot current occurs/flows;

- A steady flow, the raft floated downstream on the current - A warm ocean current that flows along the equator from the date line and south off the coast of Ecuador at Winter time
 * Current, Stream**
 * El Nino**

- Any of the ocean currents that flow westward at the equator - A warm ocean current that flows from the Gulf of Mexico northward through the Atlantic Ocean - A warm ocean current that flows northeastwardly off the coast of Japan into the northern Pacific ocean - A cold ocean current that flows north along the Pacific cost of South America before turning west
 * Equatorial current**
 * Gulf Stream**
 * Japan current, kuroshio, kuroshio current**
 * Humboldt current, Peruvian current**

Facts

 * Ocean Currents are rivers of hot or cold water within the ocean
 * Currents are generated from the forces acting upon the water like the earth's rotation
 * temperature and salinity differences and the gravitation of the moon
 * The depth contours,and other currents influence the current's direction and strength
 * An example is the Hawaiian Islands where the climateis somewhat cooler (sub-tropical) than the tropical latitudes in which they are located because of the California current
 * Surface ocean currents are generally wind driven and develop their typical clockwise spirals in the northern hemisphere and counter-clockwise rotation in the southern hemisphere because of the imposed wind stresses

__Density Currents__

 * As Ocean water becomse more denser than the water around it, a density currents occurs. A density current is when the denser water slips underneath the less dense water. The result in this causes a density current.


 * __How does Evaporation effect water density?__**
 * The more dry and warm a climate is, the more evaporation occurs.
 * Becuase of this, more water aroun d thoughs areas is evaporated, leaving behind more salt.
 * The more salt in water, the higher it's density.
 * __How does Cooling effect water density?__**
 * Cooling effects the polar regions.
 * As the water cools, more of the density particules are crowded together,
 * making the water more dense


 * __How does Freezing effect water density?__**
 * In the ice caps, freezing occurs and effects water density.
 * This happens by freezing most of the water and leaving most of the salt behind.
 * Making the water that didn't freeze denser.

Some of the most dense waters occur in: > Temperature : -1.9 C > **Salinity:** 34.6 ‰ > Second most dense water in the ocean. > **Temperature:** 3 C > **Salinity:** 34.5 ‰ > Not as dense as Antartic
 * __Where are the most dense Ocean water?__**
 * Artartic Deep Waters
 * Coldest most dense water in the ocean.
 * Is the deepst of the three major basins
 * **North Atlantic Deep Water:**

> **Temperature:** 2.2 C > **Salinity:** 33.8 ‰ > Is the less dense of the three > **Upwelling:** occurs when cold deep water comes to surface. >
 * **Antarctic Intermediate Water:**

19, Section 2**
 * Study Chapters: