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

2. Orbital-Scale Control of Ice Sheets
Ch. 10, p
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?

3. 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.

4. 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