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depth
5
ice core
Antarctica
4
Atmospheric CO2 Mixing Ratio
4
CO2 concentration
4
Historical Atmospheric CO2 Concentration
4
Siple Station
4
TRENDS-CO2
4
atmospheric CO2 concentrations
4
date air enclosed
4
date of ice
4
samples measured
4
Antarctic temperature
1
TRENDS-TEMPERATURE
1
age of the ice
1
deuterium
1
deuterium content
1
temperature variation
1
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