Download The atmosphere is the layer of air surrounding earth 1

The atmosphere is the layer of air surrounding earth
1
2
the pressure of the air in the atmosphere.
* Air pressure falls with increasing altitude
3
The greater the number of air particles the higher the pressure because the particles
collide more frequently.
4
when temperature falls, air
molecules do not collide as
frequently, so molecules move
towards each other in order to
restore a state of equilibrium,
causing density to increase
5
when temperature rises, air
molecules move away from one
another in order to restore a
state of equilibrium, causing its
density to drop.
Air moves from high pressure to low pressure. This movement causes wind.
6
7
Convection helps distribute the solar energy the earth receives. Without atmospheric
circulation the differences in temperature between the equator and the poles would
be much greater.
8
the simultaneous movement between hotter (less dense) material to rise and colder
(denser) material to sink under the influence of gravity, which consequently results in
transfer of heat.
9
Is the global-scale movement of the layer of air surrounding the Earth
10
Are major atmospheric currents that blow in a given direction according to global
patterns of movement
Easterlies: winds that come from the east
Westerlies: winds that come from the west
11
12
•
•
Air mass: a large expanse of the atmosphere with relatively uniform temperature
and humidity
Front: the line where two air masses of different temperature and humidity
meet
Air masses have stayed in a region long enough to acquire a specific temperature and
humidity-Bring changes in the weather
When two masses meet they do not combine. The cool air slides underneath the
warm air. The line where they meet is called the Front
13
•
•
•
•
Advancing cold air meets warm air
Cold air sinks below warm air forcing it to rise rapidly
cools into thick cumulus clouds
Leads to wind and heavy rain
14
15
•
•
•
Advancing warm air meets cold air
warm air rises gently above the cold air
Forms thin, light nimbostratus clouds long-lasting cloudy weather and
showers.
16
17
“H” regions : cool air sinks, increasing the air density, thus resulting in an area of high
pressure
“L” regions: warm air rises, decreasing air density, thus resulting in an area of low
pressure
18
more settled weather, clearer skies, and in summer, sunny warm days.
19
Is this happening in northern hemisphere or southern hemisphere? Northern because
the anticyclone is turning clockwise.
20
Results in cloudy, wet weather.
Cyclone: a tropical storm characterized by violent winds revolving around an area of
low pressure.
21
22
Is a natural process that allows the Earth to retain some of the heat it receives from
the Sun
23
24
Absorb and release Infrared radiation
25
26
27
Burning of fossil fuels
Clearing of farm land and burning of forests
28
Methane causes a greenhouse effect 21 times greater than carbon dioxide. Main
source comes from farming
Nitrous oxide comes primarily from applying nitrogen-rich fertilizer to farms crops
29
30
Is the abnormal modification of climatic conditions on Earth, caused by human
activity
We see changes in patterns of precipitation, wind and other aspects of climate
31
The difference between weather and climate is a measure of time. Weather is what
conditions of the atmosphere are over a short period of time, and climate is how the
atmosphere "behaves" over relatively long periods of time
32