GEOG 3110 Lecture Notes - Lecture 24: Core Sample
17 Feb 2016
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How do we know this co2 comes from burning fossil fuels? isotopic composition from atmosphere. C14 unstable isotope of carbon ancient sources of carbon are entirely depleted of c14 looking at tree rings. When we started burning coal, c14 decreased bomb c14 perturbation increased. Sediment cores pollen grains can be extracted plants grown in specific environment can make inferences of what the environment was like diatoms bloom in lakes, single-celled algae structural components are silicon based, specific environmental tolerances and preserve well. Russians chikyu, 2. 11 km beneath the sea floor is the deepest core sample we have. Rock is a bad conductor of heat energy, ie caves they are the average annual air temperature. Speliothems tree rings of the cave world, water with small amounts of co2 leaves isotopic record of water.
