Milankovitch Cycles: Is the ice age coming again?
Is the ice age coming again?
The periodic ice ages due to fluctuations in summer solar radiation in the Northern Hemisphere are called the “Milankovitch cycles.”
The axis of rotation of the earth is called the “axis”.
Currently, the earth’s axis is tilted about 3 degrees.
When the solar system was born, a planet collided with the earth.
This caused this tilt.
The angle of the earth’s axis will change by 2 to 3 degrees in about 40,000 years due to internal flow and earthquakes.
For example, due to the Great East Japan Earthquake that occurred in the sea near Japan in 2011, the earth’s axis was tilted about 7 cm on the surface.
Fluctuations in slope have a significant impact on the climate.
It is thought that one of the causes of the periodic ice age on the earth is the change of the earth’s axis.
The rotation of the earth around the earth’s axis is called rotation.
The earth’s axis rotates so that both tips form a circle.
This is called precession.
And because the earth revolves around the sun, the distance between each other is constantly changing.
The earth’s axis tilts due to the fluidity of the crust
Precession of the earth’s axis
Changes in the distance between the earth and the sun
The ice age comes periodically as the above three changes overlap and the amount of summer solar radiation in the Northern Hemisphere fluctuates.
This is called the “Milankovitch cycles”.