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of the natural a The flow of greenhouse efirgy shown in Figures 3 and 4 is the s

ID: 288537 • Letter: O

Question

of the natural a The flow of greenhouse efirgy shown in Figures 3 and 4 is the source Visible light penetrates the atmosphere and is absorbed by the The heated surface gi heated a e surface temperature warmer than it would be without a because the surface is heated both b doff nfrared light that is then absorbed by the atmosphere g the gives off infrared light out to space and also back down to Earth The bu visible light Earth's surface temperature is warmer bc the atmosphere. from the Sun and infrared light sent back from the atmospher 17) Consider sufaceenergy entering and leaving the Earth system can be ba the following debate between two students regarding the greenhouse effect So the greenhouse effect is caused by infrared light being trapped in Earth's atmosphere. Visible light from the Sun heats the ground, but infrared light given off by the ground gets permanently trapped in the atmosphere and can never escape. Student 1: the Student 2: I think that's close. But based on Figure 3, all of the arrows balance and just as much energy leaves Earth as comes in. I think the greenhouse effect makes the surface hotter than it would be without greenhouse gases because the ground gets visible light from the Sun AND infrared light from the atmosphere given off back to the surface. Do you agree or disagree with either or both of the students? Explain your reasoning o2013 Pearson Education, Inc. LECTURE-TUTORWS

Explanation / Answer

I will completely agree with statement 2 . The reason is   The earth absorbs visible light and gets hotter the earth's surface. But the Earth does not continue to get hotter and hotter as it absorbs energy from the sun, because it gives off energy to space as invisible infrared radiation. In order to come into energy balance, the amount of infrared radiation energy given off by the Earth has equal to the amount of energy absorbed from the sunlight.

Part of the energy from the sun passes through the atmosphere, is absorbed, and warms the Earth's surface. The rest is reflected, largely by clouds in the atmosphere and ice and snow on the surface, and not absorbed. The energy lost by the earth is infrared radiation emitted (given off) by the Earth. The fraction of the emitted infrared radiation passes from the surface to the space atmosphere without change. The rest of the infrared radiation, is absorbed by the greenhouse gases and clouds in the atmosphere and then re - emitted in all directions.   This ability to absorb and re-emit infrared radiation is the critical requirement for greenhouse gases. All gases whose molecules have three or more atoms are greenhouse gases - carbon dioxide (CO2), water vapor (H2O), and methane (CH4) are important greenhouse gases that have maintained Earth’s warm .

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