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2. The present-day methane concentration in the troposphere is 1700 ppbv and is rising at the rate of 10 ppbv yr-1. Using a mass balance equation for methane in the troposphere, show that the present-day emission of methane is E = 3.0x1013 moles per year. For this calculation, take 150 hPa as the top of the troposphere and neglect transport of methane to the stratosphere. The lifetime of methane in the troposphere is 9 years.
2. The present-day methane concentration in the troposphere is 1700 ppbv and is rising at the rate of 10 ppbv yr-1. Using a mass balance equation for methane in the troposphere, show that the present-day emission of methane is E = 3.0x1013 moles per year. For this calculation, take 150 hPa as the top of the troposphere and neglect transport of methane to the stratosphere. The lifetime of methane in the troposphere is 9 years.
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