Oscillations – Resonance Glacial Cycle

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Presentation transcript:

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

Glacial Interglacial Cycles 23 Kyr

Temperature Vostok

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

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

Milankovitch Theory Eccentricity Axis tilt Precession

Eccentricity Cycle 100,000 years

Precession Cycle 22,000 years

Last Glacial Maximum Ice Sheets

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