# Greenhouse Effect Research Paper

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The Greenhouse Effect
- What is the greenhouse effect and why is it important?
“The greenhouse gases absorb some of this energy and radiate much of it back towards the surface whilst the rest is radiated out to space. This plays an important role in keeping the Earth 's surface warm and able to sustain life.”
Step 1: How much energy from the sun hits the earth and what determines the amount? Based on the energy coming in, what should be the average intensity of the energy leaving the earth?
The Earth takes in a portion of the energy the Sun gives out, equaling 0.1x10^-9. The strength of the output of energy from the sun that hits the Earth is 1370Wm^-2. If the sun was to apply its energy over the Earth’s whole area (area of a sphere = 4πr^2),
If we use the surface area of the Earth, which is 5.111859325x1011m^2, then the resultant temperature is 255K when the radioactive flux is 240Wm^-2.
Step 2:
With an area of 1.277964831x1011m^2 absorbs energy from the sun, an area of 5.111859325x1011m^2 re-emits energy from the sun. The initial area absorbs 960Wm^-2 while the greater area re-radiates 240Wm^-2. When multiplied out, both values equal the same amount of energy.
Step 3:
Albedo is the amount of reflected energy from an object. Because of Earth’s average albedo of 30%, only 70% of the energy is actually taken in. If we multiply 1370Wm^-2 times .70, then the result is 960Wm^-2.
Step 4:
The calculated mean temperature of the Earth is 15°C which is 288K. When we solve for radioactive flux by using the ‘sigma T to the fourth’ rule (radioactive flux = AσT4) where A = 5.111859325x1011m^2, K = 288K and σ = the Stefan-Boltzmann proportionality continuous which is about 5.670373(21)×10^−8 W m^−2 K^−4, then the resultant radioactive flux concludes to be equaling 390Wm-2 which shows a change of 390Wm^-2 - 240Wm^-2 = 150Wm^-2.
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