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Understanding Antarctic Ice

Understanding Antarctic Ice. South Pole. Dome. road to work. Summer camp. Amundsen-Scott South Pole station. Amundson-Scott South Pole. Questions about the ice. A. How cold the ice is B. How old the ice is C. How the ice moves D. How clean the ice is. Light traveling through ice.

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Understanding Antarctic Ice

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  1. Understanding Antarctic Ice

  2. South Pole Dome road to work Summer camp Amundsen-Scott South Pole station Amundson-Scott South Pole

  3. Questions about the ice A. How cold the ice is B. How old the ice is C. How the ice moves D. How clean the ice is

  4. Light traveling through ice Object is blurred scattering absorption Object is dimmer

  5. What causes light scattering in ice? 1. Bubbles (trapped air) Q: As we go deeper, scattering by bubbles • gets stronger (worse) • gets weaker (better) • does not change Why?

  6. What causes light scattering in ice? 2. Dust particles Q: As we go deeper, scattering by dust Ans. varies wildly

  7. What causes light absorption in ice? 3. Volcanic Ash

  8. How do we know how much dust is in the ice? Old school approach: take ice cores

  9. How do we know how much dust is in the ice? Measure twice, melt once

  10. How old is the ice? (We don’t really need to know, but we can measure it.)

  11. Ice flow at the South Pole CNN The ice surface moves by one inch per day= 9 m/yr “South Pole” is marked every Jan 1

  12. Nobody knows (yet) if bottom of ice sheet is dry (frozen) or wet (melted)

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