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Transferring Thermal Energy Transferring Thermal Energy

Transferring Thermal Energy - PowerPoint Presentation

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Uploaded On 2016-07-30

Transferring Thermal Energy - PPT Presentation

Chapter 6 Section 2 Before the video Get out a sheet of paper Write an example of each type of thermal energy transfer discussed in the video Bill Nye Clip After the video Draw a diagram of each type of thermal energy transfer that you listed from the video Include the heat source wh ID: 425222

water energy heat thermal energy water thermal heat transfer air video surface convection ocean radiation wind molecules density currents earth salty radiant

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Slide1

Transferring Thermal Energy

Earth Science Applications

Objectives 4-9Slide2

Thermal Energy

Thermal Energy: sum of the kinetic and potential energy of all the molecules in an object

Thermal Energy increases as temperature increases

Heat is thermal energy that flows from high temperatures to low

temperatures

Earth’s sources of heat: Sun, gravitational contraction, radioactive decay, asteroid/meteorite bombardmentSlide3

How is heat transferred?

Conduction

Convection

RadiationSlide4

Conduction

Transfer of thermal energy through matter by the direct contact of particles

Ex:

Holding snow/ice in your hand

Holding a cup of

coffee

Earth Science: conduction occurs at Earth’s surface as the particles in the atmosphere make direct contact with the ground.Slide5

Radiation

Transfer of energy by electromagnetic waves

Travel through space regardless of matter being present or not

Ex

:

Standing by a fire to warm your hands

Earth Science: Sun

heating the EarthSlide6

RadiationSlide7

Convection

Transfer of energy by the motion of heated particles in a fluid

Energetic particles move from one spot to another, carrying energy with them

Convection

currents are a rising and sinking

action

Ex:

Lava Lamp

Earth Science: Convection

Currents on

Earth (mantle, atmosphere, oceans)Slide8

Helpful Links

Atmosphere and Ocean Live Data

Ventusky Live DataSlide9

Global Circulation Video

Overall, the Sun heats the surface of the Earth, and Earth radiates back to space about as much energy as it receives over the course of a year. (300)

Day vs. Night, Poles vs. Tropics

Balancing the budget! (301)

Tropics and other places maintain fairly constant average temps

bec

heat energy is redistributed around the world. The continual motion of air and water reallocates heat energy among Earth’s surface, oceans, and atmosphere and brings it into balance. Slide10

Energy Transfer in Oceans:

Vertically –

Water Masses (397-8) – sea ice forms, salt ions are left, cold salty water becomes denser and sinks, (H – density current) arctic, salty water migrates toward the equator along the ocean floor

Upwelling (405) – upward motion of ocean water, water originates from the bottom of the ocean and are cold, surface water is displaced by winds and replaced by upwelling deep water, waters are rich in nutrients which support marine lifeSlide11

Energy Transfer in Oceans:

Horizontally –

Density currents - arctic, salty water migrates toward the equator along the ocean floor, move slowly in deep ocean waters (403)

Surface currents – wind driven and follow wind patterns, relatively salty

midlatitude

/ subtropical water carried into polar regions and become colder and denser and sink (403)

Gyres – closed, circular current systems, five major ones, northern hemisphere = clockwise, southern hemisphere = counterclockwise

--Read page 404 and view the figureSlide12

Salinity GraphSlide13

Salinity Map

Salinity MapSlide14

Light AbsorptionSlide15

ThermoclineSlide16

Thermohaline / Global

Conveyer BeltSlide17

GyresSlide18

Energy Transfer in Atmosphere:

Global Wind Systems (305-6)

Wind (282) – air moves in response to density imbalances created by the unequal heating and cooling of Earth’s surface, works like air conditioned building, H

 L

Air Masses (303) – large body of air that takes on characteristics of the area over which it forms,

cP

cT

mP

mT

, air masses move transferring heat from one area to another to establish heat balanceSlide19
Slide20
Slide21
Slide22
Slide23
Slide24
Slide25

FRONTSSlide26

On a weather mapSlide27

Weather Map Ex