ch. 6 weather and climate mrs. sealy apes. weather –the short-term day-to- day changes in...
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Ch. 6Weather and ClimateMrs. Sealy APES
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Weather– The short-term day-to-
day changes in temperature, air pressure, humidity, precipitation, sunshine, cloud cover and wind direction and speed.
– Most weather is predicted using:
weather balloons, aircraft, radar, and satellites
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Weather Changes– Air Masses: large lump of air that
similar temperature and moisture level throughout.
– Air Masses that effect the US are
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When air masses meet it causes changes in weather
• Cold front: when a cold air mass collides with a stationary warm air mass. The result is: thunderstorms, short bursts of heavy rain
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Warm Front:
• when a warm air mass collides with a stationary cold air mass. The result is: warm steady rain
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Weather is also affected by changes in atmospheric pressure
• High pressure has descending air that moves outward from the center of the high-pressure system. Descending air is warm and dry. The result is: nice dry weather
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Low pressure• has ascending air that flows
towards the center of the low-pressure area. Ascending air-cools and condenses as it rises. The result is: clouds, rain
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Weather Extremes– Hurricanes:
• What is it? Tropical storm with winds greater than 75 mph
• The bad: loss of life and property
• The good: flushes out coastline
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Tornadoes:• Form when cold dry air collides
with warm moist air, which causes the warm air to rise quickly making a funnel cloud
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Risk of Tornadoes
Highest
High
Medium
Low
Hurricane Frequency
High
Moderately high
Gulf of Alaska
Prince Williams Sound
CANADA
UNITED STATES
Grand Banks
Atlantic OceanMEXICO
Fig. 6.2, p. 122
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Climate
– Climate is the long term average precipitation and temperature of an area
– Climate is determined by global wind patterns, latitude, altitude and ocean currents
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Climate
the average weather patterns for an area overa long period of time (30 - 1,000,000 years).
is
It is determined by
Average Precipitation Average Temperatureand
which are influenced by
latitude altitude ocean currents
and affects
where people live how people livewhat they
grow and eat
Fig. 6.3, p. 123
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Polar (ice)
Subarctic (snow)
Cool temperate
Warm temperate
Dry
Tropical
Highland
Major upwelling zones
Warm ocean current
Cold ocean current
River Fig. 6.4, p. 124
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Global Air currents affect regional climates
• Uneven heating of the Earth’s surface causes the equator to receive more sunlight making it hotter; the poles receive less light making them cooler. This causes: global circulation
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Fig. 6.6b, p. 125Initial pattern of air circulation
Deflections in the paths of air flownear the earth’s surface
30°S
Easterlies
Westerlies
Southeasttradewinds
(Doldrums)
Northeasttradewinds
Westerlies(from the west)
Easterlies(from the east)
60°S
equator
30°N
60°N
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Climate type
Cold
Cool Temperate
Warm Temperate
Tropical
(equator)
Tropical
Warm Temperate
Cool Temperate
Cold
Fig. 6.6a, p. 125
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Seasons
• Seasonal changes in temp and precipitation affect climate because the earth is tilted on its axis. It is colder in the winter and warmer in the summer because:
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Fall(sun aims directly at equator)
Summer(northern hemisphere
tilts toward sun)
Spring(sun aims directly
at equator)
23.5 °Winter(northern hemispheretilts away from sun)
Solarradiation
Fig. 6.5, p. 124
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Coriolis Effect
• Rotation of the Earth on its axis prevents air currents from moving directly north or south causing the winds to curve in what is called:
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Ocean Currents
• Long term variations in the amount of incoming solar radiation
• Heat from the sun evaporates water and transfers energy from the ocean to the atmosphere. This creates convection cells that transport heat to different latitudes. This leads to: ocean currents and weather
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Polar (ice)
Subarctic (snow)
Cool temperate
Warm temperate
Dry
Tropical
Highland
Major upwelling zones
Warm ocean current
Cold ocean current
River Fig. 6.4, p. 124
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– Ocean Currents Affect climate• Differences in water temp, winds and
the rotation of the earth create currents.
• Currents redistribute heat. For example the gulf stream brings heat to Europe
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• Upwelling is created when the trade winds blow offshore pushing surface water away from land. The outgoing surface water is replaced by nutrient bottom water. Upwelling support:
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Wind
Movement ofsurface water
Diving birds
Nutrients
Upwelling
Fish
Zooplankton
Phytoplankton
Fig. 6.9, p. 126
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The El Nino Southern Oscillation occurs every few years in the Pacific Ocean
– In an ENSO, prevailing westerly winds weaken or stop
– Surface waters along the coast of North America and South America (west) become warmer
– Normal upwelling stops– This reduces the population of some fish
species– Also causes severe weather, storms in
the US especially CA, and drought in southeast Asia
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Normal Conditions
Cold water
Warm water
Thermocline
SOUTHAMERICA
Warm waterspushed westward
AUSTRALIA
EQUATOR
Surface windsblow westward
Fig. 6.10a, p. 127
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1982–83 1997–98
Year
1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005
El Nino conditions
La Nina conditions
+3
+2
+1
0
-1
-2
Tem
per
atur
e/C
han
ge (
°F)
Fig. 6.12, p. 128
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El Niño Conditions
Cold water
Thermocline
Warm waterWarm water deepens offSouth America
SOUTHAMERICA
Warm waterflow stoppedor reversed
AUSTRALIA
EQUATOR
Drought inAustralia andSoutheast Asia
Winds weaken,causing updraftsand storms
Fig. 6.10b, p. 127
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El Niño
Unusually warm periods
Unusually high rainfall
Drought
Fig. 6.11, p. 127
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La Nina
• La Ninas follow an El Nino and are characterized by cooling trends. La Nina brings more Atlantic hurricanes, colder winters in the north and warmer winters in the south, and an increase in tornadoes.
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The chemical makeup of the atmosphere affects the weather.
Small amounts of water vapor, carbon dioxide, ozone, methane, nitrous oxide and chlorofluorocarbons trap heat in the atmosphere warming the planet. These gases are called: greenhouse gases
• The greenhouse effect is when greenhouse gases allow light, infrared radiation and UV radiation through to the surface of the earth where it is reflected back into space. The greenhouse gases trap some reflected infrared radiation
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Rays of sunlight penetrate the lower atmosphere and warm the earth's surface.
The earth's surface absorbs much of the incoming solar radiation and degrades it to longer-wavelength infrared radiation (heat), which rises into the lower atmosphere. Some of this heat escapes into space and some is absorbed by molecules of greenhouse gases and emitted as infrared radiation, which warms the lower atmosphere.
As concentrations of greenhouse gases rise, their molecules absorb and emit more infrared radiation, which adds more heat to the lower atmosphere.
(a) (b) (c)
Fig. 6.13, p. 128
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Ozone Layer• The ozone layer is located in the
stratosphere. It is created when ultraviolet light turns oxygen into ozone. The chemical reactions is:– Ozone blocks all short wavelength UV-C radiation,
50% of the UV-B radiation and almost no long wavelength UV-A radiation.
– Ozone also forms a thermal cap which: traps heat
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Topography of the earth also creates microclimates
A microclimate is small area that has a different climate than the general climate of an area.– Vegetation in an area influences climate:
forests stay warmer in the winter and cooler in the summer because of the trees
– Cities create heat islands that trap heat and decrease wind
speeds
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Cool airdescends
Land warmer thansea; breeze flowsonshore
Warm air ascends
Fig. 6.15a, p. 130
Water also changes climate by causing land breezes and sea breezes
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Warm air ascends Land cooler than
sea; breeze flowsoffshore
Cool airdescends
Fig. 6.15b, p. 130
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a Winds carrymoisture inland
from Pacific Ocean
b Clouds, rain onwindward side ofmountain range
c Rain shadow onleeward side ofmountain range
Moist habitats 15/25
1,000/85 1,800/125
3,000/854,000/75
1,000/252,000/25
Fig. 6.14, p. 129
The rain shadow effect changes climate