Hydrosphere - Unit 3 OCEANS.

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Presentation transcript:

Hydrosphere - Unit 3 OCEANS

What is density? Density is MASS per unit VOLUME

Ocean Currents Ocean currents are created by changes in: Temperature and Salinity

Ocean Temperature The Sun heats the upper layers of water. First 100 - 300 meters of water much warmer due to mixing (distributes the heat). Deeper waters are much colder, often just around 4°C.

Ocean Temperature

Ocean water and Density How do we relate ocean temperature and density? Cold water is MORE dense, therefore it will sink. Warm water is LESS dense, therefore it will rise.

Density of Ocean Water Affected by temperature. Higher temperature = lower density Lower temperature =higher density

Density of Ocean Water Affected by salinity. Low salinity = lower density Higher salinity = higher density Low Salinity High Salinity

Video Clips Ocean Current Salinity Experiment https://www.youtube.com/watch?v=PanY6AHNjuc Ocean Stratification Demo https://www.youtube.com/watch?v=7fqOtgG6vik

Ocean water exchanges heat in the water with the atmosphere Thermohaline circulation: a worldwide current system in the ocean. North American Deep Water (NADW) the deep portion of the thermohaline circulation denser, saltier, cool water that sinks moves deep beneath the surface Ocean Temperature

Types of Ocean Currents Deep Currents Caused by differences in: Temperature Salinity Surface currents Caused by: Winds Deflection off of continents Coriolis Effect

Videos Coriolis Effect Video: (https://www.youtube.com/watch?v=i2mec3vgeaI) Difference between Surface and Deep Currents: https://www.youtube.com/watch?v=3ix5SHpE2Vs

Gyres Gyres are large current systems created by global winds and the Earth’s rotation.

GYRES

Gulf Stream Part of the N. Atlantic Gyre. Warm water current that moves up the East coast of the US.

Pacific Trash Gyre Video https://www.youtube.com/watch?v=Co43TXJXryI

Convection Currents Convection currents are the movement of water due to changes in temperature

Convection Currents

Mr. Wizard!!!! Convection Currents https://www.youtube.com/watch?v=N8mCn8f3za0

How does water Keep Its Temperature? Specific Heat - the amount of heat required to change a mass of a substance by one degree in temperature. Water has a HIGH specific heat.

What does this mean? It takes a lot of heat to change the temperature of water. Once water is warmed, it takes a long time for it to lose it’s warmth.

What causes COLD water to be brought towards the surface? As the wind blows water surface water away from the shore, deep cold water is brought up to replace the surface water. This process is called an upwelling.

Upwellings Upwellings bring cold, deep, nutrient-rich water from the bottom.

Partners/Groups for OA Lab Lorin/Irina Liam/Brock Matthew/Jordan Brendan/Jared/Kevin Jerrel/Greg Raul/Cameron/Joshua Michael/Bryan Abigail/Rachael Brittany/Kallie Alex/Emilio/Brian

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