Milankovitch Cycle Historical Climate Change During warm interglacial
![Milankovitch Cycle Historical Climate Change Milankovitch Cycle Historical Climate Change](https://slidetodoc.com/presentation_image/1afaf5c79b4a0e06068aef7c58b040a0/image-1.jpg)
![• During warm, interglacial periods denoted by the grey bars, the concentrations of • During warm, interglacial periods denoted by the grey bars, the concentrations of](https://slidetodoc.com/presentation_image/1afaf5c79b4a0e06068aef7c58b040a0/image-2.jpg)
![](https://slidetodoc.com/presentation_image/1afaf5c79b4a0e06068aef7c58b040a0/image-3.jpg)
![Earth’s Natural Climate Change • Interglacial periods occur about every 100, 000 years. • Earth’s Natural Climate Change • Interglacial periods occur about every 100, 000 years. •](https://slidetodoc.com/presentation_image/1afaf5c79b4a0e06068aef7c58b040a0/image-4.jpg)
![Earth Orbit Earth Orbit](https://slidetodoc.com/presentation_image/1afaf5c79b4a0e06068aef7c58b040a0/image-5.jpg)
![Eccentricity, Spherical • 100, 000 years • Max to Max Eccentricity, Spherical • 100, 000 years • Max to Max](https://slidetodoc.com/presentation_image/1afaf5c79b4a0e06068aef7c58b040a0/image-6.jpg)
![Obliquity, Axial Tilt Varies from about 22° to 25° Period of about 41, 000 Obliquity, Axial Tilt Varies from about 22° to 25° Period of about 41, 000](https://slidetodoc.com/presentation_image/1afaf5c79b4a0e06068aef7c58b040a0/image-7.jpg)
![Precession, Wobble Precession period of about 20, 000 years. Precession, Wobble Precession period of about 20, 000 years.](https://slidetodoc.com/presentation_image/1afaf5c79b4a0e06068aef7c58b040a0/image-8.jpg)
![Why do times of glaciation occur episodically on Earth? Why do times of glaciation occur episodically on Earth?](https://slidetodoc.com/presentation_image/1afaf5c79b4a0e06068aef7c58b040a0/image-9.jpg)
![Milankovich Cycle 3 things change within Earth’s motion • 1 - The Eccentricity of Milankovich Cycle 3 things change within Earth’s motion • 1 - The Eccentricity of](https://slidetodoc.com/presentation_image/1afaf5c79b4a0e06068aef7c58b040a0/image-10.jpg)
![Orbital Forcing • About every 100, 000 years. • When all 3 variations occur Orbital Forcing • About every 100, 000 years. • When all 3 variations occur](https://slidetodoc.com/presentation_image/1afaf5c79b4a0e06068aef7c58b040a0/image-11.jpg)
![So what’s the big deal about climate change? What’s different now? So what’s the big deal about climate change? What’s different now?](https://slidetodoc.com/presentation_image/1afaf5c79b4a0e06068aef7c58b040a0/image-12.jpg)
![Group Activity • Draw a picture that shows the Earth in orbit and accounts Group Activity • Draw a picture that shows the Earth in orbit and accounts](https://slidetodoc.com/presentation_image/1afaf5c79b4a0e06068aef7c58b040a0/image-13.jpg)
- Slides: 13
![Milankovitch Cycle Historical Climate Change Milankovitch Cycle Historical Climate Change](https://slidetodoc.com/presentation_image/1afaf5c79b4a0e06068aef7c58b040a0/image-1.jpg)
Milankovitch Cycle Historical Climate Change
![During warm interglacial periods denoted by the grey bars the concentrations of • During warm, interglacial periods denoted by the grey bars, the concentrations of](https://slidetodoc.com/presentation_image/1afaf5c79b4a0e06068aef7c58b040a0/image-2.jpg)
• During warm, interglacial periods denoted by the grey bars, the concentrations of greenhouse gases, CO 2 and CH 4, were higher than during the colder, glacial periods.
![](https://slidetodoc.com/presentation_image/1afaf5c79b4a0e06068aef7c58b040a0/image-3.jpg)
![Earths Natural Climate Change Interglacial periods occur about every 100 000 years Earth’s Natural Climate Change • Interglacial periods occur about every 100, 000 years. •](https://slidetodoc.com/presentation_image/1afaf5c79b4a0e06068aef7c58b040a0/image-4.jpg)
Earth’s Natural Climate Change • Interglacial periods occur about every 100, 000 years. • Why do these glacial and interglacial changes occur?
![Earth Orbit Earth Orbit](https://slidetodoc.com/presentation_image/1afaf5c79b4a0e06068aef7c58b040a0/image-5.jpg)
Earth Orbit
![Eccentricity Spherical 100 000 years Max to Max Eccentricity, Spherical • 100, 000 years • Max to Max](https://slidetodoc.com/presentation_image/1afaf5c79b4a0e06068aef7c58b040a0/image-6.jpg)
Eccentricity, Spherical • 100, 000 years • Max to Max
![Obliquity Axial Tilt Varies from about 22 to 25 Period of about 41 000 Obliquity, Axial Tilt Varies from about 22° to 25° Period of about 41, 000](https://slidetodoc.com/presentation_image/1afaf5c79b4a0e06068aef7c58b040a0/image-7.jpg)
Obliquity, Axial Tilt Varies from about 22° to 25° Period of about 41, 000 years.
![Precession Wobble Precession period of about 20 000 years Precession, Wobble Precession period of about 20, 000 years.](https://slidetodoc.com/presentation_image/1afaf5c79b4a0e06068aef7c58b040a0/image-8.jpg)
Precession, Wobble Precession period of about 20, 000 years.
![Why do times of glaciation occur episodically on Earth Why do times of glaciation occur episodically on Earth?](https://slidetodoc.com/presentation_image/1afaf5c79b4a0e06068aef7c58b040a0/image-9.jpg)
Why do times of glaciation occur episodically on Earth?
![Milankovich Cycle 3 things change within Earths motion 1 The Eccentricity of Milankovich Cycle 3 things change within Earth’s motion • 1 - The Eccentricity of](https://slidetodoc.com/presentation_image/1afaf5c79b4a0e06068aef7c58b040a0/image-10.jpg)
Milankovich Cycle 3 things change within Earth’s motion • 1 - The Eccentricity of the Earth’s orbit varies just slightly from one maximum to the next every 100, 000 years. • Eccentricity is at its maximum = Earth is closest to the sun. • 2 - The angle of tilt, the obliquity, varies from about 22° to 25° with a period of about 41, 000 years. • 3 - Like a large wobbly spinning top, the Earth’s rotation axis precesses with a precession period of about 20, 000 years.
![Orbital Forcing About every 100 000 years When all 3 variations occur Orbital Forcing • About every 100, 000 years. • When all 3 variations occur](https://slidetodoc.com/presentation_image/1afaf5c79b4a0e06068aef7c58b040a0/image-11.jpg)
Orbital Forcing • About every 100, 000 years. • When all 3 variations occur at the same time warming begins. • The end of an ice age coincides with the times when the northern hemisphere 1. tilts toward sun at high obliquity 2. the orbital eccentricity is at a maximum 3. the Earth is closest to the sun during the northern hemisphere summer.
![So whats the big deal about climate change Whats different now So what’s the big deal about climate change? What’s different now?](https://slidetodoc.com/presentation_image/1afaf5c79b4a0e06068aef7c58b040a0/image-12.jpg)
So what’s the big deal about climate change? What’s different now?
![Group Activity Draw a picture that shows the Earth in orbit and accounts Group Activity • Draw a picture that shows the Earth in orbit and accounts](https://slidetodoc.com/presentation_image/1afaf5c79b4a0e06068aef7c58b040a0/image-13.jpg)
Group Activity • Draw a picture that shows the Earth in orbit and accounts for all aspects of the Milankovitch cycle. • Label the 3 parts and how they can vary. • Indicate on the drawing when an interglacial period is triggered.
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