Understanding Antarctic Ice

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# Understanding Antarctic Ice - PowerPoint PPT Presentation

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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Presentation Transcript

South Pole

Dome

Summer camp

Amundsen-Scott South Pole station

Amundson-Scott South Pole

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

Object is

blurred

scattering

absorption

Object is

dimmer

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?

What causes light scattering in ice?

2. Dust particles

Q: As we go deeper, scattering by dust

Ans. varies wildly

How do we know how much dust is in the ice?

Old school approach: take ice cores

How old is the ice?

(We don’t really need to know, but we can measure it.)

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

Nobody knows (yet) if bottom

of ice sheet is dry (frozen) or

wet (melted)