Changes in Spin, Tilt & Orbit of Earth (Leaving Cert CASD): Flashcards
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Orbital variations
Orbital variations
Changes in Earth's position/movement over thousands of years
Who identified the 3 astronomical cycles?
Who identified the 3 astronomical cycles?
Milutin Milankovitch
3 Milankovitch cycles
3 Milankovitch cycles
Orbital eccentricity, axial tilt, precession
Orbital eccentricity cycle time
Orbital eccentricity cycle time
100,000 & 413,000 years
Axial tilt range (degrees)
Axial tilt range (degrees)
21.5° to 24.5°
Axial tilt cycle time
Axial tilt cycle time
41,000 years
Precession cycle time
Precession cycle time
19,000-24,000 years
Ice-albedo feedback effect
Ice-albedo feedback effect
More ice reflects sunlight → further cooling
Cause of glacial periods
Cause of glacial periods
Reduced summer solar energy at high latitudes
Why orbital cycles ≠ current warming
Why orbital cycles ≠ current warming
Too slow: 10,000+ yrs vs 50-100 yrs for current change