Climate Proxys
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What is a proxy?
Inferred data from preserved physical characteristics from the past
Three points that make historical data on earth less reliable?
Lack of data Limited reliability on proxy data Researchers didn’t communicate
How have methods improved over time to make more accurate and reliable estimates about past climates?
Long term data collection Electronic monitoring systems Gas analysis of ice cores
What is direct data?
Recorded data
Give 2 examples of direct data?
Written accounts (Japanese records or Roman observations) Satellite and ocean current buoy monitoring
Give 3 example of proxy data?
Isotope ratios (oxygen-16+18 isotopes in shell and ice cores) Air bubbles trapped in ice cores Magnesium:calcium ratio in calcite shells of fossils and limestone deposits
What factors (3) affect strength of the data record?
The area it covers The timescale (length and resolution) Ability to accurately record an event
What type of method is a calibration?
Qualitative