Climate and change
- Created by: joshua millyard
- Created on: 30-05-13 12:32
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- Climate and change
- Past climate change
- How do we know climate has changed?
- fossils animals found in regions where not found today
- glaciation regions now free ice
- evidence ice cores show Co2 and oxygen atmosphere when ice formed
- what is climate?
- Average weather conditions over a long period of time
- How do we know climate has changed?
- The cause of change
- Volcanoes!
- Large eruptions spew poisonous gasses
- dust blocks out incoming solar radiation
- Mt Pinataubo 1991, Laki eruption 1783 Mt Toba 70k yrs ago
- Sunspots?
- Sunspots darker areas sun mean greater solar activity
- come cycle 11 yrs
- periods few seen 1645-1715 'Little Ice Age'
- change in earths orbit/rotation
- shape of earths orbite change know ECCENTRICITY
- Earth wobbles axis known PRECESSION
- tilt on axis
- Volcanoes!
- Case study: The Little Ice Age
- What is it?
- periods of climate change in recent past between 1300-1870
- What caused it?
- Probably caused North Atlantic oscillation
- Imapct
- The Baltic Sea froze over
- winters colder longer
- cold conditions lead crop failure
- Greenland abandoned survival impossible
- price grain increase
- commercial vineyards disappear in England
- storminess flooding increase
- What is it?
- Impact on megafauna
- Extinction takes place species no time adapt
- temperature increase 5 degrees in very short time (1000yrs)
- During period 130 species disappear
- could not cope climate change food disappearing so died out
- humans hunt to extinction
- During period 130 species disappear
- Greenhouse effect
- What is it?
- Greenhouse gasses retain heat sun otherwise would be reflected
- most sun energy absorbed group radiated back into atmosphere trapped by GG
- Impact on global temperature and sea level
- GG directly linked global warming
- Sea level change
- ice caps glaciers melting
- THERMAL EXPANSION water expands
- What is it?
- What we do and why we do it
- What we do
- Industrial revolution
- ppl produce 10-25 tonnes Co2 yr
- Rapid industrialisation
- why we do it
- energy supply
- transoprt
- industry
- Other origins of GG
- Nitrous Oxide produced jet engines, fertiliser, sewage
- Methane - cows
- Human activities cutting trees
- What we do
- Impact on global temperature and sea level
- GG directly linked global warming
- Sea level change
- ice caps glaciers melting
- THERMAL EXPANSION water expands
- Case study: What future
- UK
- Enviromental
- Rising sea level
- low lying ares cost too much protect risk flood London increase
- Changing temperatures and rainfall
- Temp rise change rainfall patterns cause drought
- Wild weather
- Increase storminess + erosion on coasts
- Changing ecosystem
- Species disappear and return
- Rising sea level
- Economic
- Agriculture
- farming patterns change more vines
- Industry and services
- rist London pose serious threat centre economic trade
- Tourism
- benefit less need travel overseas4 sun
- Agriculture
- Enviromental
- UK
- Past climate change
- periods of climate change in recent past between 1300-1870
- Important!
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