UNIT 2: Heating of the atmosphere€¦ · at the Earth’s surface as you move from the Equator to...
Transcript of UNIT 2: Heating of the atmosphere€¦ · at the Earth’s surface as you move from the Equator to...
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UNIT 2:
Heating of the atmosphere
Mrs. T. Herbst
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Heating of the atmosphere
• Space and time
• Insolation spread through atmosphere
• Energy transferred from Earth’s surface
• Factors influencing temperatures at
different places
• The greenhouse effect
• Global warming
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1. Temperature changes over
space and time
• Over Space
– Temperatures differ over the earth’s surface
• Hotter at Equator
• Colder at Poles
• Over time
– Nights colder, days warmer
– Winter colder, summer warmer
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Topic 1 Unit 2 Activity 5
DOING RESEARCH, p51
Mrs. T. Herbst
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Scale Designer Nationality Which
countries
use it?
Freezing
point temp
Boiling
point temp
° Celsius Anders
Celsius
Swedish South Africa
and most
other
countries
0°C 100°C
° Fahrenheit Daniel
Gabriel
Fahrenheit
German USA, Alaska 32°F 212°F
1. Two scales are used to measure temperature. Find
out about the people who developed these scales.
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• Cape Town
• Today
– High 21°C
– Low 18°C
• Temperature range:
3°C
• Beaufort West
• Today:
– High 32°C
– Low 16°C
• Temperature range:
16°C
2. Use media sources to
compare daily temp. ranges.
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2. Use media sources such as newspapers, radio
and TV to compare the daily temperature range in
places like Cape Town and Beaufort West. How
do you explain the differences you see?
– Cape Town – next to the ocean, Sun’s rays
penetrate deeper into water. Water heats and
cools slowly, so the temperature range is
smaller.
– Beaufort West far away from ocean. Land
heats and cools quickly, so the temperature
range is larger. (Only top few centimetres
heat up)
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3. Study Fig. 39. Describe the main
seasonal temperature variations by
referring to specific temp. and regions
• The highest temperatures (20-30°C) are
found along the equator.
– Reason: Intense heating by direct sunrays
• Lowest temperatures (-50°C to -10°C) are
found at poles
– Reason: more terrestrial radiation than
insolation, (more scattering, reflection and
absorbtion of insolation)
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4. Discuss the seasonal temperature
changes in SA. Refer to specific
temperatures and regions
• The average temperature (±15°C) of
South Africa’s coastal regions, is lower
than the interior and northern regions.
(±20°C) in summer =(Distance from
ocean causes warmer summer in the
interior/ cooler summer at coast)
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3. Processes associated with the
heating of the atmosphere (Page 52)
• Sun is the source of nearly all heat energy
• Sun heats Earth through insolation.
• Then Earth becomes a radiating body
• Earth then gives off terrestrial radiation,
which is absorbed by the atmosphere.
• THIS IS THE HEAT THAT WE FEEL!
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Processes associated with the
heating of the atmosphere
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3.How is insolation (sun) spread
through the atmosphere?
• Absorption (66%)
– Water vapour, dust, gas, clouds
• Scattering (12%)
– dust and gas molecules
• Reflection (22%)
– Clouds, water and land surfaces
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4. How is energy transferred from the
Earth’s surface? (Terrestrial radiation)
• Radiation
– Short-wave radiation reaches ground, changes to
long-wave radiation which heats the atmosphere
• Conduction
– In the 1st metre of atmosphere, energy moves from
molecule to molecule (packed together)
• Convection
– Moving molecules distribute heat, through strong
vertical movements by gas / liquid
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Topic 1 Unit 2
Activity 6
Map Analysis and calculations
p53
Mrs. T. Herbst
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1. What is the general trend in insolation
at the Earth’s surface as you move from
the Equator to the poles?
• A decrease in insolation as you move from
the equator to the poles.
– Reason: Equator receives direct
concentrated sunrays
• However, there is first an increase in
insolation towards the tropics, before there
is a decrease.
– Reason: “Turning around” of the direct rays
during the different solstices
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The Sun is directly overhead at
"high-noon" on Summer Solstice
at the latitude called the Tropic of
Cancer.
The Sun is directly overhead at
"high-noon" on Winter Solstice at
the latitude called the Tropic of
Capricorn.
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2. How does the average insolation in watts
per square metre over most of South Africa
differ from that over Patagonia
• South Africa: ±240 watts /sq.metre
• Patagonia: ±80 - 120 watts /sq.metre
– Reason: Patagonia's temperatures are
relatively cold for its latitude due to the
cold Malvinas Current and the high altitude.
• Source: Wikipedia
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3. What natural feature is situated where
the areas of highest insolation on
continents are found?
• Deserts
– REASON: Deserts exist because of low
rainfall, thus less clouds.
– Less clouds = less absorption, scattering or
reflection of heat energy
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4. Create a balance sheet that shows
what happens to the sun’s energy
radiated to Earth.
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Earth’s Energy Balance
“Income” “Loss”
Insolation from sun 100% Reflected by clouds 20%
Scattered by air 6%
Reflected by water and
land surfaces
4%
Absorbed by clouds and
emitted to space
3%
Absorbed by greenhouse
gases and emitted to
space
16%
TOTAL LOSS 49%
NETT INSOLATION
(Absorbed by water and
land)
51%
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4. Factors influencing temperatures
at different places (Page 54)
• Latitude
– Equator vs. Poles
• Altitude
– Height above sealevel
• Ocean currents
– Warm or cold ocean current
• Distance from the sea
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Latitude
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5.1 Latitude
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5.2 Altitude
• Temperatures decrease the higher we go
up in the Troposhere
• Normal lapse rate (NLR) : 6.4°C / km
• Example:
– Mount Kilimanjaro at the equator (3 ̊South), covered with snow all year (height 5895 m above sea level)
– Town Moshi down the slopes: Annual
mean temperature 23,3 ̊C
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5.3 Ocean Currents
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Port Nolloth
on West
Coast:
MeanAnnual
Temperature:
14,2 ̊C
Durban on
East Coast:
Mean Annual
Temperature:
18.6 ̊C
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5.4 Distance from the ocean
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TOPIC 1 UNIT 2
ACTIVITY 7
DATA ANALYSIS AND ATLAS USE
P55
Mrs. T. Herbst
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1.Use an atlas/map to find the positions of
the towns in this table. Complete the table
Place How far from Equator? How far from the sea?
Nairobi Near equator Far from sea
Harare Inside tropics Far from sea
Bloemfontein South of Tropic of
Capricorn
Far from sea
Cape Town Furthest from equator Situated on the coast
Durban South of Tropic of
Capricorn
Situated on the coast
Port Nolloth South of Tropic of
Capricorn
Situated on the coast
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2. The first 3 places have an altutude of
around 1500m above sea level, but are
at different latitudes.
• Explain the pattern in their temperatures:
– They have a high temperature range because
they are far from the sea.
– The further away from equator, the cooler the
temperature
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3. Why are the temperatures for
Bloemfontein and Port Nolloth different?
• Port Nolloth: Temperature range is small
– next to the sea (Maritime climate)
• Bloemfontein: Big temperature range, far
from sea (Continental climate)
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4. Why are the temperatures for
Durban and Port Nolloth different?
• Durban: Summer AND Winter
temperatures are higher than Port Nolloth
– Reason: Warm Mozambique ocean current
on east coast next to Durban, Cold Benguela
ocean current next to Port Nolloth.
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5. Climate Graphs (Page 56)
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Topic 1 Unit 2
Activity 8
Read a climate graph
p56
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1. What is the latitude of
Buenos Aires? (Atlas)
• 34° 36’ South
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Figure 45
Temperature
Rainfall
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2. Use fig. 45. Name the
following:
a) The 3 hottest months
a) November 23°C, December 23°C,
January 22°C
b) The 3 coldest months
b) May 11°C, June 10°C, July 9°C
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3. Is Buenos Aires in a winter or
summer rainfall area?
• Neither summer nor winter rainfall area
– Reason: Receives rain throughout the year
with a maximum of 110mm in March.
(Southern Hemisphere Autumn), and 100mm
rain in Dec.
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Topic 1 Unit 2
Activity 9
Draw a climate graph
p57
Mrs. T. Herbst
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1. Draw a temperature graph using the
data in table 2 for Mossel Bay
Monthly Temperatures for Mossel Bay
MONTHS
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2. Draw a rainfall graph for Mossel Bay,
using the data in table 2
MONTHS
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3. What are the advantages of showing
climate data as a graph?
• It is easier to see patterns of temperature
and rainfall, quickly and easily.
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4. Give one disadvantage of showing
climate data as a graph rather than
statistics.
• Data is rounded to the nearest ten in order
to draw a graph. So the graph is not as
accurate as the actual statistics.
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5. Use an atlas to find the
latitudes of…
a) Mossel Bay:
– 34° 11 ‘ South
b) Tokyo:
– 35° 40’ North
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6. Compare the climate of Mossel Bay
with Buenos Aires and Tokyo
Climate elements Mossel Bay Buenos Aires Tokyo
Amount of rainfall Min: 29-30mm to a
Max of 40mm
Min: 60mm to a
Max of 110mm
Min: 50mm to a
Max of 240mm
Monthly
distribution
Throughout the
year, with most at
equinoxes
Throughout the
year with most in
March
Minimum in
January, Maximum
in Sept
Maximum Temp. 21°C 23°C 26°C
Warmest Months Jan; Feb Nov; Dec August
Season Summer Summer Summer
Minimum Temp. 15°C 9°C 3°C
Coldest Months Jul, Aug, Sept July January
Season Winter Winter Winter
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Comparison of data: Buenos
Aires and Mossel Bay.
• a)Although Buenos Aires gets much more
rainfall than Mossel Bay, it is spread in a similar
way throughout the months of the year.
• Max temperatures in Buenos Airesare only 2 °C
higher than Mossel Bay, but they are
experienced two months earlier in the summer.
• Mossel Bay remains warmer in winter with a
temperature of 15 °C compared to Buenos Aires’
monthly temperature in July which is 6°C lower.
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Comparison of data (Tokyo and
Mossel Bay)
• b) Tokyo gets 6 times more rain than Mossel
Bay. The rain shows a clear minimum in
January, increasing steadily until September,
then decreasing again.
• The maximum summer temperature occurs in
August in Tokyo, when it is 5 °C higher than
Mossel Bay’s summer maximum of 21 °C.
• Mossel Bay remains much warmer in winter with
a minimum temperature of 15 °C, compared to
Tokyo’s minimum January temperature of 3 °C
(12 °C lower)
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6. The greenhouse effect (Page 58)
• Atmosphere allows insolation in…
• ..but then traps outgoing terrestrial
radiation by gases such as CO2 and water
vapour
• = “Natural Greenhouse effect”
• Warms atmosphere
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The greenhouse effect
• Human activities have increased the
amount of greenhouse gases
• = “Enhanced greenhouse effect”
• Will cause a gradual increase in Earth’s
average atmospheric temperatures =
Global warming
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Greenhouse effect
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How can greenhouse gases be
reduced?
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Topic 1 Unit 2
Activity 10
The Greenhouse gases
p60
Mrs. T. Herbst
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1) Short Wave
radiation: (UV)
passes directly
through the
greenhouse gases
4) As more heat is
retained , the
earth’s atmosphere
will become warmer
3) CO2: Released by
factories, exhausts,
animals
Water vapour: From
evaporation of water
Methane: when
bacteria break down
(fermentation)
Nitrous Oxide: Fossil
fuels, power stations,
exhausts, fertilisers
CFC’s: Aerosols, air
conditioners,
refrigerators
2) Long-wave
radiation (infrared) is
either absorbed by the
greenhouse gases or
re-radiated back to
earth’s surface
Blanket effect of greenhouse gases
EARTH’s SURFACE
GREENHOUSE GASES
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7. Global Warming – Evidence? (Page
61)
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How do greenhouse gases
cause global warming?
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8. Possible impact on climate
change in Africa (Page 62)
• Possible temp. increase of 4°C by 2080
– As much as +7°C in South and +8°C in North
• Rising sea levels
– Drastic effects on populated low-lying areas
• Climate changes: Extreme droughts,
followed by heavy rainfall = desert
expansion DESERTIFICATION
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Possible impact on climate
change in Africa continued..
• Change of weather patterns = failure of
crops
• Migration of animals and people to avoid
deserts (increasing aridity)
• Extinction of animals and plants due to
habitat change
• Flooding
• Conflict (war) over scarce resources
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Topic 1 Unit 2
Activity 11
Data Analysis and
research
p63
Mrs. T. Herbst
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1. Why has there been an increase
in carbon dioxide production?
• Increased industrial activities
• Burning of fossil fuels increase
• More production of cement
• Burning of vegetation to clear
land
• All of the above as a result of the
increasing global population.
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2. Describe AND explain the relationship between
the carbon dioxide levels and the global average
temperature over the time period
• With the constant rise of CO2,
temperature also rise.
• Increase in human activities,
increases greenhouse gases,
which absorbs more heat. Heat
does not escape = enhanced
greenhouse effect
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3. How can Africa be affected
by Global warming?• Rise in sea levels: South Coast of
Senegal, Lagos, Nile delta: Loss of
coastal land, population relocate
• Desertification: East Africa and Sahel :
People will have to relocate
• Drought: Sahara / SA: Significant
decrease in rainfall, and harvests
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• Floods: East and West Africa: People
displaced, increase in waterborne
diseases (cholera)
• Conflict over resources: Resources
become scarce due to climate change,
people start to fight about the resources –
food shortages in Sub-Sahara Africa
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4.
Kyoto Protocol• Where: Kyoto, Japan
• When: 16 Feb 2005
• Which countries: Europe, all UN
members, except Andorra, Canada, South
Sudan and USA
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Revision UNIT 2 page 65
Answers
1.
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Unit 2 Answers continued
2a) Insolation / Solar radiation
b) Sun: Short waves; Earth: Long waves
Reason: Only light (white) heat from
sun reaches earth, and light waves are
short. Earth absorbs these short waves, and
returns it to the atmosphere in the form of
infrared radiation, which are long waves.
(invisible to naked eye)
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• c) Radiation
– Short-wave radiation reaches ground, changes to
long-wave radiation which heats the atmosphere
• Conduction
– In the 1st metre of atmosphere, energy moves from
molecule to molecule (packed together)
• Convection
– Moving molecules distribute heat, through strong
vertical movements by gas / liquid
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d)
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e)
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• f) Possible temp. increase of 4°C by 2080
– As much as +7°C in South and +8°C in North
• Rising sea levels
– Drastic effects on populated low-lying areas
• Climate changes: Extreme droughts,
followed by heavy rainfall = desert
expansion
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• Change of weather patterns = failure of
crops
• Migration of animals and people to avoid
deserts (increasing aridity)
• Extinction of animals and plants due to
habitat change
• Flooding
• Conflict (war) over scarce resources