Proxy data
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What are historical written records and how does it determine earth’s conditions in the past
• newspapers , diary entries , ships logs • gives us actual evidence of conditions in the past
What are tree rings and how does it determine earth’s conditions in the past
• trees grow rings per year - the depth and width changes • thinner and darker = colder and dryer years • thicker and lighter = warmer and wetter
What are ice cores and how does it determine earth’s conditions in the past
• ice builds up in layers annually • thicker and lighter = more precipitation and warmer weather • thinner and darker = less precipitation and colder conditions • oxygen isotope analysis - change in the ratio of 016 : 018
What are the limitations of proxy data
• subjective • doesn’t go back very far • biased
What methods do we use today
• weather stations • weather balloon • satellites
How do we collect atmospheric data
• % of GHG’s • temp - thermometer • pressure - borometer
How do we collect data on land
• temp - thermometer
How do we collect data from oceans
• temp - thermometer • sea levels • salinity
How do we collect data from space
• cloud cover • number of storms -colour of oceans
Pros of modern methods
• more advanced • more ways of collecting more data
Cons of modern methods
• only a short history • expensive
Pros of proxy methods
• they’ve been used for longer so more data to compare
Cons of proxy methods
• can be subjective and biased • there are limitations to collecting data as not all places have the right things