mt everest 1921 2010. you should have created a table of impacts. walk around the class and add to...
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Locate the places on a map.TRANSCRIPT
Mt Everest1921 2010
You should have created a table of impacts. Walk
around the class and add to your table.
Locate the places on a map.
LINKS!
• Describe and explain one example of short term climate change
Glacial retreat as evidence for global warming.
• Mean global temperature is rising. Although temperature has fluctuated in the past (Little ice age and medieval warm period) we have recently seen significant changes in glaciers from all around the world.Since 1960 we have lost an estimated 8,000km3 of ice.
Mt Everest1921 2010
Sea level rise as evidence for global warming
• Change in sea level can be Isostatic or Eustatic
Change due to thermal expansion of oceans and an input of ice melt from land glaciers.
During the last ice age, land was depressed by the weight of ice. It is presently still rising following the retreat of the ice.
One of these is more localised than the other.
FACT!• Measures taken at 23 stable tidal
sites around the world show that mean sea levels rose by 20cm during the twentieth century.
http://www.bbc.co.uk/learningzone/clips/evidence-for-global-warming-sea-level-change/1497.html
Cities at risk if sea level rose by 10m
• Buenos Aries, Argentina • Bangkok, Thailand• Delhi, India• Casablanca, Morocco • Brisbane, AU• Perth, AU
What do these words mean?
Put the cards in chronological order
B= Breidamerkjuj ö kullF= Fjallsy ö kull IcelandS= Solheimaj ö kull
Evidence of climate change: Glacial advance and retreat
Key:B= Breidamerkjuj ö kull
F= Fjallsy ö kullS= Solheimaj ö kull
10,000 Advance7,000 Advance5,000 Advance4,500 Retreat…
1850 Most glaciers retreated globally
1865 Growth of B glacier
B glacier is larger and at lower altitude – closer to sea level explaining a greater amount of recession compared to F.
Why is it difficult to prove that humans have had an influence
over climate change?
Case study- Environmental factors affecting climate.
Questions• How high does the ejected material
from a volcano need to reach to affect climate?
• How much material was ejected from the June 1991 eruption of Mt Pinatubo?
• How did this event affect the climate?
Describe and explain how an environmental factor that you have studied can affect the climate.
Peer markingNamed example
E.G. Mt Pinatubo √
Use of facts E.G. 20 million tonnes of sulphur dioxide and ash were ejected into the stratosphere
√
Description of effect
E.G. The material reflected infrared radiation back into space
√
What is the effect?
E.G. Can lead to a cooling of Earth’s average temperature
√
REMEMBER:
2 stars and a wish!!
E.G.
*: You included appropriate facts.
--*: You could explain a bit more about
the effect of the eruption.
Today we’re going to look at:
Environmental factors affecting climate
• http://www.bbc.co.uk/learningzone/clips/causes-of-climate-change/1491.html