Milankovitch theory
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The Milankovitch cycle theory explains changes in the Earth's orbit that cause variations in seasons over long periods of time. The theory was proposed by Serbian astronomer Milutin Milankovitch and attributes climate shifts to three factors: eccentricity affecting the distance between Earth and Sun, obliquity changing the tilt of Earth's axis, and precession altering the orientation of Earth's rotational axis over thousands of years. Together, these orbital variations influence the amount of solar radiation received to potentially trigger ice ages and temperature fluctuations.
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Milankovitch theory
- 2. Milankovitch Cycle The Milankovitch or astronomical theory of climate change is an explanation for changes in the seasons which result from changes in the earth's orbit around the sun. The theory is named for Serbian astronomer Milutin Milankovitch
- 3. Milankovitch Cycle Eccentricity Obliquity Precession
- 4. Eccentricity Eccentricity is a term used to describe the shape of Earth's orbit around the sun. The variation of Earth's orbit around the sun ranges from an almost exact circle (eccentricity = 0.0005) to a slightly elongated shape (eccentricity = 0.0607). The impact of the variation is a change in the amount of solar energy from perihelion (around January 3) to aphelion (around July 4).
- 5. Eccentricity
- 6. Eccentricity • The Earth's orbit around the Sun, like other planet's orbits, is not a perfect circle. It is an ellipse. This means that the Earth is closer to and further away from the Sun at different times in the year. • Perihelion - when the Earth is closest to the Sun (usually happens in January) • Aphelion - when the Earth is furthest from the Sun (usually happens in June)
- 8. Eccentricity
- 9. Eccentricity
- 10. Eccentricity
- 12. Eccentricity
- 13. Obliquity Obliquity is the variation of the tilt of the earth's axis away from the orbital plane. The tilt varies between 22.1o and 24.5o and the average is 23.5o The obliquity changes on a cycle taking approximately 40,000 years
- 14. Obliquity Currently, the axis of rotation for the earth is tilted at 23.5° However, this value changes from a minimum of 22.5° to a maximum of 24.5° and takes 41,000 years to complete one cycle
- 15. Obliquity
- 16. Obliquity
- 17. Obliquity
- 18. Obliquity The more tilt means more severe seasons - warmer summers and colder winters; less tilt means less severe seasons - cooler summers and milder winters
- 19. Obliquity
- 20. Precession Precession is the change in orientation of the Earth's rotational axis. The precession cycle takes about 19,000 - 23,000 years.
- 21. Precession
- 22. Precession
- 23. Precession
- 24. Precession
- 30. References • http://www.physicalgeography.net/fundamen tals/7y.html
Editor's Notes
- ptation Climate mitigation is any action taken to permanently eliminate or reduce the long-term risk and hazards of climate change to human life, property. The International Panel on Climate Change (IPCC) defines mitigation as: “An anthropogenic intervention to reduce the sources or enhance the sinks of greenhouse gases.” Climate Mitigation and Adaptation Climate adaptation refers to the ability of a system to adjust to climate change (including climate variability and extremes) to moderate potential damage, to take advantage of opportunities, or to cope with the consequences. The IPCC defines adaptation as the, “adjustment in natural or human systems to a new or changing environment. Adaptation to climate change refers to adjustment in natural or human systems in response to actual or expected climatic stimuli or their effects, which moderates harm or exploits beneficial opportunities. Various types of adaptation can be distinguished, including anticipatory and reactive adaptation, private and public adaptation, and autonomous and planned adaptation.”