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Methane in the Atmosphere: Processes & Impacts

Understand the dynamics of methane levels in the atmosphere with detailed insights into sources, removal processes, and associated emissions. Explore the interplay between natural wetlands, fossil fuels, and biomass burning using metric tons/year data. Avail of the provided links for in-depth analysis and calculations.

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Methane in the Atmosphere: Processes & Impacts

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  1. Below is a picture showing the amount of methane in the atmosphere (3500 Tg = 3500 tons) and the major processes adding methane to and removing methane from the atmosphere. Units are all in metric tons (or 106 grams) and metric tons/year of methane Loss by chemical reaction 520 TONS/YR -57 per mil 0.8 Methane in atmosphere 4680tons Natural wetlands tons/yr W -65 per mil 1.0 https://webfiles.uci.edu/setrumbo/public/IMPRS/fossil%20fuels.xls?uniq=-1o7yls Fossil fuel associated emissions tons/yr F -40 per mill 0 Biomass burning tons/yr B -20 per mil 1.0 W+B+F = 520 W*(-65) +B(-20) + F*(-40) = 520*(-57) W*1.0 + B(1.0) +F*0 = 520*0.8

  2. V = volume of air in hemispehre (assume equal in N, S) Xn, Xs = mixing ratio of CO2 in N, S (assume 315 in 1958) Rate of exchange between hemispheres is V/1yr For F, B see spreadsheet Northern hemisphere Southern hemisphere VXn VXs F fossil fuel) B/2 S B/2 S https://webfiles.uci.edu/setrumbo/public/IMPRS VdXs (t)/dt =VXn(t-1)/1yr +B/2 – S VdsXn (t)/dt = VXs(t-1)/1yr +B/2 –S +F S+S =(1- 0.57)F = 0.43 F VdXn/dt + VdXs/dt = 0.57F Moles air in atmosphere =2V = [1.78 x 10^20] Moles CO2 in air in 1950 = 315 x 10^-6 * 1.78 x 10^20 moles

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