Climate and Weather PPT

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Transcript Climate and Weather PPT

Climate – weather
conditions at one location
over a long period of time.
Weather – atmospheric conditions at a
particular location and time.
Seasons
 Earth is tilted at 23.5 degree
angle. The earth revolves around
the sun every year. (364 ¼ days)
 Tropic of Cancer and Capricorn
mark the farthest northern &
southern points the sun is directly
overhead at 12 pm.
 Equinox- twice a year, the days
and nights throughout the world
are equal in length; begins in fall
and spring.
BNSC - Earth and Moon Earth’s
rotation
http://www.fourmilab.ch/cgibin/Earth/action?opt=-p Look at the
location of the sun right now.
Greenhouse Effect
Greenhouse Effect animated diagram
1. Earth receives energy from
the sun = solar radiation
2. Earth’s surface absorbs
solar energy, then releases
it back to space as infrared
radiation (IR).
3. Some of the IR radiation
emitted by the earth is
unable to escape back into
space.
4. The trapped IR radiation
returns to the earth as heat.
BBC - Weather Centre - Climate Change
- Greenhouse Effect Watch the
greenhouse effect in action
What is Global Warming?

1.
2.
3.
Global Warming YES!
The three main gases that
trap IR radiation on earth;
1. Carbon dioxide – CO2
2. Methane – CH4
3. Water – H20
The earth’s temperature
has been steadily rising
since mid 1900s due to
human consumption.
USA & Australia are the
only 2 countries that have
not agreed to the Kyoto
Protocol.
 Global Warming NO!
1. The earth’s temperature
goes through recurring
cycles of warming and
cooling trends.
2. Data is inconclusive
regarding.
3. Rather than being “made” by
an outside agency to reduce
greenhouse gases,
President Bush developed a
plan where industries could
“voluntarily” cut gases by
4.5% by 2010.
Global Wind Currents
1.
2.
3.
4.
5.
Wind, ocean currents help
distribute the sun’s heat
worldwide.
Convection is the upward
motion of air that transfers
heat into the atmosphere.
Coriolis Effect – the
bending of winds due to the
earth’s rotation.
Ocean currents resemble
rivers flowing in the ocean.
Warm water flows from the
equator toward the poles,
while cold, polar water flows
toward the equator.
Types of Precipitation
Send in the Clouds
Click here for various
types of clouds.
Mid-latitude frontal storms feature cold dense
air masses that push lighter warm air masses
upward causing precipitation to form.
Typical of hot climates,
convection occurs after morning
sunshine heats warm moist air.
Clouds form in the afternoon
and rain falls.
Associated with mountain areas,
orographic storms drop more
rain on the windward side of a
mountain and create a rain
shadow on the leeward side.
Types of Climates
 Cut and paste your blank world map into your
climate folder.
 Make a key using 12 different colors for each
type of climate zone.
 As we discuss types of climates, color in the
appropriate areas on the globe.
 Use pgs. 60 and 61 in your textbook as a
guide.