What do you understand by negative and positive radiation forcing in the atmosphere? Give example of pollutants which can cause negative and positive radiation forcing. While, describing, mention the quantity of radiative forcing of that particular pollutant?
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The radiative forcing concept
A radiative forcing is an energy imbalance imposed on the climate system either externally or by human activities (examples: changes in solar energy output, volcanic emissions, deliberate land modification, anthropogenic emissions of greenhouse gases, aerosols, and their precursors). It is usually expressed in watts per square meter (W/m2) averaged over a particular period of time. A radiative forcing is something that can usually not be observed, but provides a simple quantitative basis for comparing the response in global mean temperature to different imposed agents.
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