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Chap. 13 Section 2 Density Currents - GREAT for review!!!

Added Feb 29, 2016 •

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now we have 24.2 currents under the Surface 2 objectives here describe the flow of density currents and then identify factors that affect the density currents of ocean water Google Cavallari terms density current and upwelling make sure you get those in your lab notebooks before we begin key idea here deep ocean currents are driven by properties that determine the density so deep ocean currents are driven by density of water such as salinity salinity and temperature  no density drives ocean currents under the surface when an area water becomes more dense than the waters around it the denser water moves beneath the less dense water forming of flowing current all the density current not at what locations follow along the blue line and the red line all the way across the globe what locations do deep currents rise to the surface if you meant cancer the Indian Ocean and North Pacific you're correct and where do the surface currents sink to the become deep currents that's right in the North Atlantic  how density currents can flow vertically or horizontally temperature and some vdr two factors that influence the density of an area of water so let's check out the density currents from Polar water now these are deep currents from Polar areas that flow through the make ocean the depth of each current depends on its density so as you see on the bottom with it equator right in the middle and we have the South the Antarctic the South and then we have the north getting closer to the North Pole or the Arctic  now how far does the North Atlantic remediate water extend North Atlantic intermediate water that's this water right here  it goes from about 45 Rees North down to about 10 degrees north  now which current is the most dense where the densest that's right that's bottom on the Antarctic bottom water and which currents are closest to the surface water North Atlantic intermediate water and Antarctic intermediate water good now the densest seawater comes from polar regions the density of water is also high in areas of high evaporation density currents are caused by race  now why is the salinity of the water in the Mediterranean higher than that of the water in the Atlantic so the Mediterranean has a salinity of about 40 PSU the Atlantic Ocean is less than sand has a salinity of 35 PSU this is the Straits of search called the Gibraltar sill and noticed that there is a two-way flow of water crossing over the sill Mediterranean underneath in the Atlantic Ocean so again the question is why is the salinity of water in the Mediterranean higher than that of the water in the Atlantic  well because climate is hot and dry water in the Mediterranean evaporates at a higher rate leaving Salt behind so again going back to our processes evaporation and freezing both leaves salt find sold increase the salinity  how does salinity affect the density of water the higher the salinity the greater the density  why do sir currents from the Atlantic flow into the Mediterranean  now the surface currents bring in less dense Atlantic water up here near the surface take the place of the dense water that flows out from them at a training right underneath here it's and a darker blue an upwelling is a type of density current in which surface water is displaced in cold dense water rises to to replace it so surface water is displaced the surface winds push that water out of the way and cold water help Wells to the surface now El Nino is an ocean current that brings unusually warm water to the west coast of South America these currents occur on average about every 4 years during El Nino years the trade winds that drive surface currents off the coast weekend and as a result the upwelling that normally occurs near their Peruvian and Chilean Chilean Coast is reduced greatly harming those countries fish Industries up World water contains large amounts of nutrients that phytoplankton eat phytoplankton need this water right up here in order to grow phytoplankton the microscopic organisms that are the basic food for all their other living things in the oceans thrive in areas of upwelling animals higher in the food chain can live what's the phytoplankton in areas of high upwelling as result these areas are usually major commercial fishing areas that's it for 24.3 or 24.2 next up 24.3

Uploaded by Greg Grammer.

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Chap. 13 Section 2 Density Currents - GREAT for review!!!

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