Greenhouse effect Water vaporclouds and certain atmospheric gases carbon

Greenhouse effect water vaporclouds and certain

This preview shows page 40 - 52 out of 81 pages.

Greenhouse effect – Water vapor/clouds and certain atmospheric gases (carbon dioxide, methane, CFC, NOx, etc.) absorb infrared heat, provide a sort of insulating blanket and increase global temperature. The phenomenon is same as that of greenhouses that are used to produce crops in cold countries. Glass wall of a green house allows solar short wave to enter but prevent long wave to go out from the house increasing temperature inside the greenhouse. Our atmosphere behaves almost similar fashion so that it is termed as Greenhouse effect.
Image of page 40
Green House effect Greenhouse is glasshouse used in cold climatic countries to produce crops/vegetables. Glass allows short wave to enter, but long waves are trapped and make the greenhouse warmer. Sunlight that reaches earth, warms both the atmosphere and the surface. Earth’s atmosphere system then radiates heat as infrared radiation. Water vapor and several other gases, including carbon dioxide, methane, and Chloro-Fluoro Carbons (CFCs), warm Earth’s atmosphere because they absorb and reemit radiation. They trap some of the heat energy radiating from Earth’s atmospheric system. The trapping and warming is somewhat analogous to a greenhouse, which also traps heat; thus the process has been called the greenhouse effect.
Image of page 41
Why it is named as Green House Effect ? Sunlight Warming Glass house GREN HOUSE crop Usually in clod countries they produce crops in side green house
Image of page 42
Climate
Image of page 43
Image of page 44
Green house effect Chemical Makeup of the Atmosphere that Lead to the Greenhouse Effect Small amounts of certain gases play a key role in deter mining the earth's average temperatures and thus its climates. These gases include (1) water vapor (H 2 0), (2) carbon dioxide (C0 2 ), (3) methane (CH 4 ), (4) nitrous oxide ( N 2 0 ), and (5) synthetic chlorofluorocarbons (CFCs). Together, these gases, known as greenhouse gases, act somewhat like the glass panes of a greenhouse: They allow mostly visible light and some infrared radiation and ultraviolet (UV) radiation from the sun to pass through the troposphere.
Image of page 45
Green house effect The earth's surface absorbs much of this solar energy. This transforms it to longer wavelength infrared radiation (heat), which then rises into the troposphere. Some of this heat escapes into space, and some is absorbed by molecules of greenhouse gases and emitted into the troposphere as even longer wavelength infrared radiation, which warms the air. This natural warming effect of the troposphere is called the greenhouse effect. The basic principle behind the natural greenhouse effect is well established. Indeed, without its current greenhouse gases (especially water vapor, which is found in the largest concentration), the earth would be a cold and mostly lifeless planet.
Image of page 46
Climate
Image of page 47
The Greenhouse Effect
Image of page 48
The Greenhouse Gases
Image of page 49
Green House Effect (cont)
Image of page 50
Climate The anthropogenic greenhouse effect is related to the following three factors: (1) The burning of fossil fuels, which in recent years has added about 5.5 GtC (gigatons, or billions of metric tons, of carbon) per year to the atmosphere. The carbon combines with oxygen to formCO 2 .
Image of page 51
Image of page 52

You've reached the end of your free preview.

Want to read all 81 pages?

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

Stuck? We have tutors online 24/7 who can help you get unstuck.
A+ icon
Ask Expert Tutors You can ask You can ask You can ask (will expire )
Answers in as fast as 15 minutes