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Evidence of Past Climates

This article explores four fundamental sources of information that help assess past climates: tree ring data, ice core records, sediment cores, and fossils. Tree rings reveal growth patterns influenced by climate, while ice cores from polar regions contain 800,000 years of trapped air and dust, providing insights into atmospheric conditions. Sedimentary rocks and cores from lakes and oceans offer over a million years of evidence about past environments. Fossils indicate the types and numbers of organisms present, reflecting the climate conditions of their time.

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Evidence of Past Climates

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  1. Evidence of Past Climates

  2. Assessing Past Climates • Four key sources of information about past climates: • 1) Tree Ring Data • 2) Ice Core Records • 3) Sediment Cores & Sedimentary Rocks • 4) Fossils

  3. Tree “cookie” Tree Ring Data • Every year a tree creates a growth ring • Wet and Moderate Temperatures •  rapid growth  ____________________ thick ring • Dry and Extreme Temperatures •  slow growth  ____________________ thin ring Tree core sample

  4. Ice Core Data Ice Core Lab Drilling ice cores in Greenland Studying an Ice Core

  5. Ice Core Data • Taken from polar and glacial ice • 800,000 year record in Antarctic ice! • Evidence: • 1) trapped air bubbles • 2) dust, pollen record • 3) Ice chemical composition

  6. Sedimentary Rocks and Sediment Cores from Lakes and Oceans • Over1 million year record • Evidence: pollen, chemical • composition of shells

  7. Fossil Record • Types and number • of fossil organisms • indicate environment • and climate at time • they were deposited

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