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Radiation and Earthís Atmosphere
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The earthís global average surface temperature in present climate is 15C (59F). Without the atmosphere, it would be -18C (-0.4F),

The earthís global average surface temperature in present climate is 15C (59F). Without the atmosphere, it would be -18C (-0.4F),

About 33C or 59.4F colder! Atmosphere is the most important component of the earthís climate.

Radiation vs. other heat sources:

Total energy enter the earthís atmosphere: 174 petawatts or 174X1015 Watts

Solar: 99.978%, Geothermal: 0.013%, waste and fossil fuel: 0.007%, tidal: 0.002%

Slide 2

Earthís Atmosphere

Earthís Atmosphere

1. What is it?

A thin gaseous envelope around the planet.

2. Composition

Todayís atmosphere: nitrogen (78%), oxygen (21%), other (1%) Ė trace gases!

Nitrogen, oxygen, argon, water vapor, carbon dioxide, methane, and most other gases are invisible.

Clouds are not gas, but condensed vapor in the form of liquid droplets or ice particles.

Ground based smog, which is visible, contains reactants of nitrogen and ozone.

3. Structure

Four layers:

Troposphere

(overturning)

Stratosphere

(stratified)

From surface to 8-18 km

From troposphere top to 50 km

Mesosphere

Thermosphere

Blue sky!

Slide 3

The Structure of Earthís Atmosphere

The Structure of Earthís Atmosphere

1. Four layers defined by

temperature

2. Importance to climate and climate change

Troposphere:

Troposphere:

Stratosphere:

Mesosphere:

Thermosphere:

T decreases with elevation

T increases with elevation

T decreases with elevation

T increases with elevation

80% of Earthís gases

Most of Earthís weather happens

Most of the measurements

Stratosphere:

19.9% of Earthís gases

Ozone layer:

Blocking Sunís ultraviolet radiation

Slide 4

Energy from the Sun

Energy from the Sun

1. Characteristics

Travels through space (vacuum)

in a speed of light

3. Importance to climate and climate change

In the form of waves:

In stream of particles

Electromagnetic waves

(Photons)

Primary driving force of Earthís climate engine

2. Electromagnetic spectrum

From short wavelength, high energy, gamma rays to long wavelength, low energy, radio waves

Releases heat when absorbed

Ultraviolet, Visible, Infrared

Slide 5

Sunís Electromagnetic Spectrum

Sunís Electromagnetic Spectrum

Solar radiation has peak intensities in the shorter wavelengths, dominant in the region we know as visible, thus shortwave radiation

Slide 6

Blackbody Radiation Curves

Blackbody Radiation Curves

Any object above absolute zero radiates heat, as proportional to T4

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