Climate Change Evidence
- Created by: FraserHarold
- Created on: 06-05-14 18:34
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- Climate Change: Evidence
- Long Term Change
- Ice Cores
- Show different layers of an ice sheet.
- Gases in ice analysed to find data such as temperature / CO2 levels of each year
- Over last 400,000 years in Antarctica, temperature fluctuates
- Glacial periods (100,000 yrs) and Interglacial Periods (10,000 yrs)
- Max. 280ppm in last 800,000 years.
- Up to 380 in 2007
- Over last 400,000 years in Antarctica, temperature fluctuates
- Gases in ice analysed to find data such as temperature / CO2 levels of each year
- Show different layers of an ice sheet.
- Pollen Analysis
- Pollen can be preserved in sediment, shows past ecology
- Can be dated, showing a change in ecosystems from glacial to interglacial
- Tundra in G, forests in IG
- Can be dated, showing a change in ecosystems from glacial to interglacial
- Pollen can be preserved in sediment, shows past ecology
- Ice Cores
- Medium Term Change
- Tree Rings
- Produced each year as tree grows. Good conditions create thick ring
- The different rings show what climates were like each year, up to 10,000 years ago
- Produced each year as tree grows. Good conditions create thick ring
- Retreating Glaciers
- Size of glacier shown by deposition of rocks. Rocks are dated to show when
- Distance of deposited rocks to current glacier position
- EG. Further away, bigger increase in temperature
- Distance of deposited rocks to current glacier position
- Size of glacier shown by deposition of rocks. Rocks are dated to show when
- Historical Records
- EG. Paintings, farming data, written accounts
- Last glacial period around 18000 years ago
- Now interglacial period
- Tree Rings
- Short Term Change
- Weather
- Records kept since 1861, help to show detailed change
- Polar Ice
- Data shows reduction of ice at both poles
- Increased melting showing increasing temperature
- Data shows reduction of ice at both poles
- Ecosystems
- Climate affects food and shelter supplies
- Species distribution indicates climate changes
- Climate affects food and shelter supplies
- Over last 1000 years, sharp temperature rise
- Over last 100 years, steady rise, slight fluctuations
- Weather
- Data Reliability
- Less uncertainty now due to more use of modern technology
- Geographical Info Systems
- Data now on a global scale in detail
- Less uncertainty now due to more use of modern technology
- Long Term Change
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