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Oceanic Changes

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by

Ranaldo Smith

on 17 February 2014

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Transcript of Oceanic Changes

Background photo by t.shigesa
Upwelling Events
Upwelling is a process in which currents bring deep, cold water to the surface of the ocean. Upwelling is a result of winds and the rotation of the Earth.
Upwelling Events=$$$
Challenge
Winds=Currents=Nutrients
Oceanic Changes
Downwelling-
Into the Deep
Whats in Salt Water?
Remember Plants need______ & Animals
need ________!
they provide about 50% of the fish harvest brought back to shore by the world’s fisheries.
Downwelling is a kind of reverse upwelling. Instead of deeper water rising up, warm surface water sinks down. Upwelling and downwelling patterns often alternate seasonally.
seawater has many different gases dissolved in it, especially nitrogen, oxygen and carbon dioxide. CO2 is also used by some animals to help build their shells!
Some properties of seawater affect how much gas can be dissolved in it:
o Cold water holds more gas than warm water.
o Seawater with low salinity holds more gas than high salinity water.
o Deep water, which has a high pressure, holds more gas than shallow water.
In 1977, scientists diving in Alvin to the Galápagos Rift discovered a new community of organisms. These organisms can withstand tremendous pressure, high temperatures, utter darkness, and
toxic chemicals. These organisms are called extremophiles because of the extreme nature of their living conditions.
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