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Interaction of Climate and Geologic Processes Weathering Volcanic Activity Sea-level change

Interaction of Climate and Geologic Processes Weathering Volcanic Activity Sea-level change Plate tectonics. Paleoclimatology : Studying Ancient Climate . Direct measurements of temperature available for ~200 years at most. Scientists rely on proxy data as indirect

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Interaction of Climate and Geologic Processes Weathering Volcanic Activity Sea-level change

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  1. Interaction of Climate and • Geologic Processes • Weathering • Volcanic Activity • Sea-level change • Plate tectonics

  2. Paleoclimatology: • Studying Ancient Climate • Directmeasurementsof temperature • available for ~200 years at most. • Scientists rely on proxy data as indirect • measurementsof temperature for pre-historic • periods. • Oxygen isotope data (sediments, glacial, ice, corals) • Fossil pollen • Tree growth rings

  3. Oxygen Isotopes O-16 O-18

  4. O-16 O-16 O-16 O-18 O-16 O-16 O-18 Ocean O-18 O-16 O-18 O-18 O-16 O-18 O-18

  5. Ice O-16 O-16 O-16 O-18 O-16 O-16 O-18 Ocean O-18 O-16 O-18 O-18 O-16 O-18 O-18

  6. Foraminifera • Micro-organisms • that lives near the • ocean surface. • Composition is CaCO3 • Dead organisms settle to • the bottom as sediment youngest oldest

  7. Coral data

  8. Direct measurements: 200 years Historical info 1 ,000 years Pollen 30, 000 years Time scales of different Temperature proxies Deep sea sediments: 150,000 ears Deeps sea sediments: 1 million years http://www.globalchange.umich.edu/globalchange1/

  9. Composition

  10. http://www.globalchange.umich.edu/globalchange1/

  11. http://www.eoearth.org/article/Milankovitch_cycles These are cycles in the Earth's orbit that influence the amount of solar radiation striking different parts of the Earth at different times of year. Milankovitch Tutorial

  12. Milankovich cycles

  13. NASA’s website is a great place to learn more about the scientific side of the climate change issue: Climate Change: Vital Signs of the Planet

  14. Summary Earth’s climate is subject to long-term variability related to astronomical and geologic factors. Recent, rapid change in earth’s climate is mostly attributable to human factors.

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