Lecture 19: Orbital Variations in Ice Sheets

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Presentation transcript:

Lecture 19: Orbital Variations in Ice Sheets Chapter 9 (p. 155-163) This lecture was prepared on 1/23/2005 (Sunday). Took me 5 hours (from 8:00pm to 1:00am)

Orbital-Scale Control of Ice Sheets Ch. 10, p. 210-229 18000 yrs ago, ice sheets surrounded much of the Arctic Ocean. Today, ice sheets exist only on Greenland. Tectonic-scale cooling caused ice sheets to appear, but why did they grow and melt over (the shorter) orbital-scales?

What Controls the Size of Ice Sheets Ice sheets exist because ice accumulates more than melts. Both depend on temperature  insolation  season Summer insolation controls the size of ice sheets.

Ice Growth and Decay: Force and Response Delayed bedrock sinking  + feedback to ice growth Ice sheets lags behind summer insolation forcing - - Delayed bedrock rebounding  + feedback to ice decay