the natural greenhouse effect and anthropogenic (enhanced) greenhouse effect

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The Natural Greenhouse Effect and Anthropogenic (Enhanced) Greenhouse Effect

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The Natural Greenhouse Effect and Anthropogenic (Enhanced) Greenhouse Effect. Definition: “Anthropogenic” = Caused by humans; resulting from human influence on the natural world. The Natural Greenhouse Effect: Notes. Natural process! - PowerPoint PPT Presentation

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Page 1: The Natural Greenhouse Effect and Anthropogenic (Enhanced) Greenhouse Effect

The Natural Greenhouse Effectand

Anthropogenic (Enhanced) Greenhouse Effect

Page 2: The Natural Greenhouse Effect and Anthropogenic (Enhanced) Greenhouse Effect
Page 3: The Natural Greenhouse Effect and Anthropogenic (Enhanced) Greenhouse Effect

Definition: “Anthropogenic” =

Caused by humans; resulting from human influence on the natural world

Page 4: The Natural Greenhouse Effect and Anthropogenic (Enhanced) Greenhouse Effect
Page 5: The Natural Greenhouse Effect and Anthropogenic (Enhanced) Greenhouse Effect

Natural process!

GHGs (greenhouse gases) and clouds absorb infrared radiation from earth’s surface, and radiates it back towards the surface;

Heats the atmosphere and surface (keeps earth warm enough for life);

The Natural Greenhouse Effect: Notes

Page 6: The Natural Greenhouse Effect and Anthropogenic (Enhanced) Greenhouse Effect
Page 7: The Natural Greenhouse Effect and Anthropogenic (Enhanced) Greenhouse Effect
Page 8: The Natural Greenhouse Effect and Anthropogenic (Enhanced) Greenhouse Effect

What are some ways that humans contribute GHGs into the atmosphere?

Vehicles, industrialization, deforestation (cut down trees which remove CO2 from air)

Why is this also called the Enhanced Greenhouse Effect?

Natural Greenhouse Effect is strengthened and amplified by human contributions.

Page 9: The Natural Greenhouse Effect and Anthropogenic (Enhanced) Greenhouse Effect

Keeling Curve (CO2 Seasonal Variations)

Page 10: The Natural Greenhouse Effect and Anthropogenic (Enhanced) Greenhouse Effect

What accounts for the seasonal rise and fall in CO2 in the Keeling Curve?

Plant photosynthesis in summer (CO2 goes down), less photosynthesis in winter (CO2 goes up)

What planet is cold due to a lack of CO2 in its atmosphere? What planet demonstrates the results of an abundance of atmospheric CO2?

Mars (cold), Venus (hot)

Page 11: The Natural Greenhouse Effect and Anthropogenic (Enhanced) Greenhouse Effect
Page 12: The Natural Greenhouse Effect and Anthropogenic (Enhanced) Greenhouse Effect

Why is CO2 of concern compared to water vapour (another GHG)?

Permanence, longer lasting in atmosphere (average: 100 years)

What source of evidence do we have for CO2 levels prior to the Industrial Revolution?

CO2 dissolved in ice cores, layers in ice cores indicate years/age.

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Page 14: The Natural Greenhouse Effect and Anthropogenic (Enhanced) Greenhouse Effect