1. Oscillations – Resonance Glacial Cycle
B. Tremblay
McGill University
GRL Dec 12, 2006

2. Glacial Interglacial Cycles
23 Kyr

3. Temperature Vostok

4. 60°N Summer Insolation
Minima coincide with glaciations, maxima with deglaciations.

5. Milankovitch Cycles = Pacemaker for Climate Variations
Holocene
LGM
Orbital frequencies:
- Precession
(19 and 23 kyr)
- Tilt (41 kyr)
- Eccentricity
(100 kyr)
MIS3
MIS5
MIS = Marine Isotope Stages

6. Milankovitch Theory
Eccentricity
Axis tilt
Precession

7. Eccentricity Cycle 100,000 years

9. Precession Cycle 22,000 years

10. Last Glacial Maximum Ice Sheets