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Energy%20From%20the%20Sun

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Energy From the Sun Other Human Activities Humans also cut down large areas of forests which would naturally take carbon out of the atmosphere Global Warming Global ... – PowerPoint PPT presentation

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Title: Energy%20From%20the%20Sun


1
Energy From the Sun
2
Questions
  • What is the ultimate dource of energy for our
    planet?
  • How does that energy get to Earth?
  • How does that energy move around on Earth?

3
Convection
  • Convection is the mechanism of heat transfer in
    which highly energetic molecules move from one
    place to another.
  • Ex. Water at the bottom of the
  • skillet receives thermal energy by
  • conduction. The water expands as
  • it warms, becoming less dense.
  • The less dense water rises and
  • denser, cooler water moves down
  • to take its place. This movement
  • creates convection currents

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Conduction
  • Conduction is the mechanism of heat transfer in
    which highly energetic atoms or molecules collide
    with less energetic atoms or molecules, giving
    them some energy.
  • Ex. The atoms of a stove-top
  • element moving very rapidly
  • and colliding with the atoms of
  • a skillet, giving thermal energy to
  • the skillet

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Radiation
  • Radiation is the mechanism of heat transfer in
    which atoms or molecules emit electromagnetic
    waves. These waves carry energy through space and
    deposit it only when they interact with some
    other form of matter.
  • Ex. If you hold your hand over the element of the
    stove you can feel the radiant energy from the
    element. The energy is converted to thermal
    energy when it interacts with the hand

11
Solar Radiation
  • Radiant energy takes the form of electromagnetic
    rays. These rays can have a wide variety of
    wavelengths, but the electromagnetic waves that
    carry radiant energy from the Sun to the Earth
    contain a very narrow range of wavelengths. The
    ultraviolet radiation reaching the earth takes
    the form of visible light

12
Solar Radiation Contd
  • Because space contains very little matter, the
    solar energy that arrives at Earths outer
    atmosphere is essentially the same as it was when
    it left the Sun.
  • The amount of energy that reaches the Earths
    outer atmosphere is described as the Earths
    solar constant.
  • The solar constant is the amount of radiant
    energy that hits 1 m2 of the Earths outer
    atmosphere (at a perpendicular angle) every
    second.

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The Greenhouse Effect
  • The Greenhouse effect is the natural process by
    which the Earths Atmosphere traps heat for a
    period of time, allowing it to stay at a
    relatively constant temperature worldwide (15 C)

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Greenhouse Gases
  • Greenhouse gases are gases in the Earths
    atmosphere which store thermal energy for a
    period of time causing the greenhouse effect.
  • The most common greenhouse gases are
  • Carbon dioxide
  • Methane
  • Water vapour
  • Nitrous oxide
  • ozone

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The Enhanced Greenhouse Effect
  • This is an unnatural, human influenced phenomena
    whereby human activities cause an increase in the
    amount of greenhouse gases in our atmosphere
  • This causes the atmosphere to hold in more
    thermal energy than it otherwise would
  • This leads to an increase in the temperature
    within our atmosphere GLOBAL WARMING AND
    SUBSEQUENT CLIMATE CHANGE

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Human Activities Leading to the Enhanced
Greenhouse Effect
  • The major human contribution to global warming is
    carbon dioxide emmissions
  • Anytime we burn a fossil fuel to release energy
    we release carbon dioxide into the atmosphere
  • Fossil fuels are fuels humans combust to generate
    energy which contain carbon
  • Common fossil fuels
  • Gasoline
  • Oil
  • Coal
  • Natural gas

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Other Human Activities
  • Humans also cut down large areas of forests which
    would naturally take carbon out of the atmosphere

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Global Warming
  • Global warming is an increase in the average
    temperature of the Earths atmosphere due to the
    enhanced greenhouse effect
  • Minor changes in temperature can have dramatic
    implications for our planet

38
Effects of global warming
  • Climate change
  • Melting of polar ice caps
  • Glacial retreat
  • Sea level rise
  • Species extinction
  • Changing of agricultural patterns
  • Tropical disease
  • Seasonal pattern changes
  • Drought
  • Increased severe weather events
  • Human displacement
  • Habitat loss
  • Economic disaster

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Manitoba Example
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Myths
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Solutions
  • Weve all heard of ways to stop global warming
  • It comes down to reducing carbon emissions into
    the atmosphere
  • Humans will always require energy, so we must
    find greener technologies (technologys which
    generate energy without emmiting carbon) and be
    smarter about how we use energy

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