Question 7: What is the total radiative forcing due to anthropogenic greenhouse

Question

Question 7: What is the total radiative forcing due to anthropogenic greenhouse gases? Question 8: Prior to the addition of anthropogenic greenhouse gases, the Earth had an Energy of 238 W/m'. What new Energy would be necessary for the Earth to be in energy balance again, after the addition of the GHGs? Question 9: The emission temperature of the Earth is 254.5 K. a) What new temperature does the Earth need to radiate at in order to produce the Energy from Q8? b) How much of a warming is this? Hint: you'll need to be precise (one decimal place will do it) to see the difference. c) Is the warming of the Earth you just calculated in Q9b a forcing or a feedback? Question 10: Figure 2.2a shows the global temperature anomaly since 1880. Compare your answer from Q9b to the warming shown in the graph. Does it seem reasonable to suggest that greenhouse gases are responsible for this warming? Why or why not? Explain your reasoning in a couple sentences

Explanation / Answer

Following is the individual radiative forcing due to greenhouse gases:

Caron Dioxide: 1.75 W/m2

Methane: 0.52 W/m2

Halocarbons: 0.4 W/m2

Nitrous oxide: 0.2 W/m2

Lower atmosphere Ozone: 0.4 W/m2

Strat Ozone: -0.05 W/m2

Strat Water Vapor: 0.075 W/m2

The total radiative force will be:

1.75 + 0.52 + 0.4 + 0.2 + 0.4 - 0.05 + 0.075 = 3.295 W/m2 is the radiative forcing due to green house gases.

Please ask rest of the questions in separate questionnaire.

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