ATM S 111 Lecture Notes - Lecture 10: Radiometric Dating, Ice Core, Core Data
7 Feb 2019
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Document Summary
Paleoclimate: climate of the past, hot climates. Ice ages: last few thousand years, what sets the climate over earth"s history, the sun. Its changes magnitude over its lifetime: over the last billion years, increased by 10% Initially 75% as strong as it is now: the orbit of the earth around the sun. Ice at the bottom of greenland/antarctica is over 100,000 years old: e. g. ice cores have tiny bubbles of air trapped inside that reveal past atmospheric composition, geological data, rocks, sediments, shape of land, etc. Land in seattle is cut out by glacier flows from when ice sheets used to have a much larger extent. Isotopic data: many pf the previously mentioned datasets can be dated using carbon dating or other radiometric dating techniques, also isotopes can tell us about precipitation and temperature, previous warm climates. Sea level in the cretaceous was 200m higher. Ice core records: present day ice sheets provide excellent records of the past.
