Download energybudget Greenhouse - Hewlett


Insolation is either absorbed or reflected

It affects all life and activities on Earth

Whether there is a higher percentage of
radiation or reflection, depends on the
following factors
SURFACE
% reflected
Dense, dry, clean snow
86-95
Clean sand
37
Ice sheet
26
Grass
25
Decidudous forest
17
Pine forest
14
Ploughed field---moist
14
Swamp
10-14
Presence of cloud cover
Clouds absorb and reflect some incoming
energy. In the day, less heat will reach
the ground
At night, clouds act as blankets to
prevent heat from returning to space
Volcanic explosion can put dust in
the air that acts like
clouds.
Not Too Warm, Not Too Cold
A Gardener’s
Greenhouse…
1. Sun rays enter
greenhouse and
strike surfaces.
2. Heated air rises
3. Glass traps heat
inside.
Earth’s Greenhouse

Earth’s atmosphere
acts like a
greenhouse…
1. Sun passes through the
atmosphere and heats
land & water.
2. Some heat goes back
into the atmosphere.
3. Heat trapped by water
vapor, carbon dioxide,
Methane, & other gases
will be sent back to
Earth.
What are greenhouse gases?
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Global warming: true or false?
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The local effects of climate change
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Greenhouse Animation
Ozone & Greenhouse Effect
Ozone: filters out most of the ultraviolet (UV)
radiation given off by the sun.

Enough is absorbed to allow life to exist
Greenhouse Effect- a hole has developed in the
Ozone that allows excess UV in


Once through the UV cannot be released so it
reflects back and forth between the ground and
the atmosphere
Continuing to warm the earth,
Aspect of the Land
 In the Northern Hemisphere,
the south-facing slopes are
warmer. Why?
 The reverse is true of the
Southern Hemisphere.