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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- IIT JAM
- Geology (GG)
What is milankovitch cycle?
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The Milankovitch cycles describe how relatively slight changes in Earth's movement affect the planet's climate.
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Rahul kumar Best Answer
The Milankovich cycles are caused by changes in the shape of the Earth's orbit around the sun, the tilt of the Earth's rotation axis, and the wobble of our axis. The mass and movement of the other planets in our solar system actually affect the Earth orbit just as our planetary mass similarly affects their orbits. As the Earth's orbit changes, so too does the amount of sunlight that falls on different latitudes and in seasons. The amount of sunlight received in the summer at high northern latitudes appears to be especially important to determining whether the Earth is in an ice age or not. When the northern summer sun is strong, the Earth tends to be in a warm period. When it is weak we tend to be in an ice age. As we come out of an ice age, the sea level rises about 400 feet, and we enjoy a warm period 'like' the one we are in now. That is the natural cycle, brief warm periods followed by an ice age about every 100 thousand years. There are three general factors that determine the forcing changes in the Milankovitch cycles. 1. Eccentricity (the elliptical changes in the earths orbit around the sun) 2. Obliquity (the tilt of Earth's axis toward and away from the sun) 3. Precession (the wobble of Earth's axis toward and away from the sun) Refer to the attached figure.