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Atmospheric Conditions

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Miss Cummins

on 6 October 2015

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Transcript of Atmospheric Conditions

Atmospheric Conditions
The Atmosphere
Think layer of gases surrounding Earth

Ususly reffered to as AIR

Constantly changing
The Atmosphere
Extreme temperatures
Hold heat from sun
While also blocking the earth from much of the sun's incoming ultraviolet radiation
Insolation comes from:
The location
Angle of the Sun's rays
Revise all of this for a test on Tuesday !!!

Page 68 to 71

What is solar energy?
Main source of heat

Distributed unevenly

Unequal heating - movement of air an water
The solar system contains one main star .......?
30% of solar radiation relfected by clouds/dust/earths surface
Energy passes through atmosphere on the way to earth
20% absorbed by ozone layer, dust, clouds and carbon dioxide
Some solar radiation absorbed by water droplets

Ultraviolet radiation is absorbed by ozone high in the stratosphere
The Layers of the Atmosphere
Several layers
Each with own particular characteristics

The Sun
Big star

Provides energy

Without it > cold and dark

Main source of heat and light

Sun's rays >>> heat rays

These rays warm the _________?
Content of the Earths Atmosphere
400 km thick
Most of it is within 16km of the Earth's surface
No exact place where atmosphere ends
Gets thinner and thinner and merges with outer space
The Solar System
Worksheet on planets
Work with person beside you - quietly
3 minutes
Go !
Lowest part - troposphere

This is where the weather forms

Heated by :
Radiation (heat waves)
Convection (warm air rising)
Earth's Insolation
Uneven heat over earth's surface

Two things that affect the amount of insolation actually absorbed by the earth's surface are:
The angle of the sun's rays
The content (clouds/dust/water vapour) of the atmosphere
Throughout the day insolation flows towards the earth's surface
The angle varies with:
1. The location
2. The time of day
3. The season
Suns rays most direct at the equator
Earths shape > increasing angle as distance from equator increases
This means a decrease in temperature
Therefore poles have the lowest temperature
Time of day
Earths revolves on its axis over the course of the day

Angle's change as time passes
As day goes on angle increases
Earth orbits the sun every 365 and 1⁄4 days
Different parts are tid towards the earth at different times of the year
Tilted towards the sun = more sunlight
Winter and Summer in the Northern Hemisphere
- Northern hemisphere

Earth tilted away from the sun

Sun located above the Tropic of Capricorn

Nights are long
Days are short
Earth receives less solar energy
- Northern Hemisphere

Earth is tilted towards the sun

Sun is over the Tropic of Cancer

Days are long
Nights are short
Earth receives more solar energy

Length of day and nights
Linked to seasons in hemispheres
Sun moves -
insolation changes
Ireland - less insolation between Sept-March
Rays are directed at Southern Hemisphere
Water Vapour
Insolation must pass through this window - much of it is lost
Reflection - 30%
Absorption - 20%
Leaves only 50% to directly heat earth
Clouds act like a barrier
Reflect the energy back into space
In some climates upto 75% can be reflected
The surface also reflects some energy back into space
The amount depends on the surface's reflective capacity or
Lighter surfaces reflect a lot but absorb less

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