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green house effect

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Introduction

GREEN HOUSE EFFECT

The greenhouse effect, first discovered by Joseph Fourier in 1824, and first investigated quantitatively by Svante Arrhenius in 1896, is the process in which the absorption of infrared radiation by an atmosphere warms a planet. Without these greenhouse gases, the Earth's surface would be up to 30 °C cooler. The name comes from an incorrect analogy with the way in which greenhouses are heated by the sun in order to facilitate plant growth. In addition to the Earth, Mars, Venus and other celestial bodies with atmospheres (such as Titan) have greenhouse effects.

In common parlance, the term greenhouse effect 

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Middle

, scientific opinion on climate change and attribution of recent climate change).

The Basic Mechanism

The Earth receives energy from the Sun in the form of radiation. To the extent that the Earth is in a steady state, the energy stored in the atmosphere and ocean does not change in time, so energy equal to the incident solar radiation must be radiated back to space. Radiation leaving the Earth takes two forms: reflected solar radiation and emitted thermal infrared radiation. The Earth reflects about 30% of the incident solar flux; the remaining 70% is absorbed, warms the land, atmosphere and oceans, and powers life on this planet. Eventually this energy is reradiated to space as infrared photons. This thermal, infrared

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Conclusion

visible solar radiation but strongly absorbing at the wavelengths of the thermal infrared radiation emitted by the surface and the atmosphere. The visiblesolar radiation heats the surface, not the atmosphere. Whereas most of the infrared radiation escaping to space is being emitted from the upper atmosphere, not the surface. The infrared photons emitted by the surface are mostly absorbed by the atmosphere and do not escape directly to space.

atmosphere and oceans, and powers life on this planet. Eventually this energy is reradiated to space as infrared photons. This thermal, infrared radiation increases with increasing temperature. One can think of the Earth's temperature as being determined by the requirement that it produce the infrared flux needed to balance the absorbed solar flux.

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Here's what a star student thought of this essay

3 star(s)

Response to the question

The response to the question is done well apart from the missing sections. Although the greenhouse gas effect caused by humans and the effects they are having on the planet needs to be discussed for this essay to have any ...

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Response to the question

The response to the question is done well apart from the missing sections. Although the greenhouse gas effect caused by humans and the effects they are having on the planet needs to be discussed for this essay to have any real weight.

Level of analysis

The candidate begins with an explanation of what the greenhouse gas effect is but the definition is not entirely accurate. I'm also not sure the candidate needed to go into who discovered the effect as it is not directly relevant to the essay. Although their definition does get better when they explain there are two different meanings of the greenhouse gas effect. The essay would have been better aided by a diagram. A paragraph is repeated twice, and the start of one paragraph is missing which should be amended.

Quality of writing

Punctuation, grammar and spelling fine. Format needs concentrating on as said above.


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Reviewed by skatealexia 07/08/2012

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