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Glaciology

Glaciology. •. Glaciology. >~75% of worlds freshwater supply Covers about 10% of land surface If melted , sea levels would rise 70 meters Two types Valley or alpine Continental – Ice Sheets – Ice caps. Converting snow to ice. Powder (90% air) Granular Snow (50%)

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Glaciology

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  1. Glaciology •

  2. Glaciology • >~75% of worlds freshwater supply • Covers about 10% of land surface • If melted, sea levels would rise 70 meters Two types • Valley or alpine • Continental – Ice Sheets – Ice caps

  3. Converting snow to ice • Powder (90% air) • Granular Snow (50%) • Firn (20-30% air) • Glacial Ice(20% air)

  4. The budget of a glacier • Zone of accumulation • Zone of wastage • Snowline • Negative versus positive budgets

  5. The movement of a glacier Tangential component of gravity

  6. Till and moraines

  7. Landforms resulting from glaciation • U-shaped valleys• Hanging valleys

  8. Landforms Resulting From Glaciation • Cirques • Tarns • Paternoster lakes

  9. Landforms Resulting From Glaciation • Arêtes • Horns

  10. Landforms Resulting From Glaciation • Eskers • Kettles • Kames • Drumlins

  11. Milankovitchhypothesis • Eccentricity, Obliquity, and Precession

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