Methane emissions from different sources recalculated for carbon equivalent

Methane reserves -4800 TgCH4 Partial pressure -1.7 ppm Annual growth - 40 TgCH/yr (-1%) Lifetime - 9.6 years 

Participating OH radicals form in the atmosphere during water vapor photolysis. As a result, the simplest diagram of methane oxidation in the atmosphere is the following  

Let the marsh surface temperature vary cyclically with frequency w and amplitude A, decreasing with depth 7V(0, t) = A(z) cos(ujt), where 

The solution to Equation (4.32) enables us to trace temperature variations Tw(z, t) and suggests the conclusion that in this case these variations weakly depend on TW(Q, t). Even if 7V(0, /) increases by 2°C, then according to (4.32), the amplitude of temperature changes with depth will rapidly decrease to 0.97°C, 0.33°C, and 0.01°C at depths 40cm, 2m, and 3m, respectively. Hence, with a 2°C increase in the average global atmospheric temperature, flux FlCH4 will increase by no more than 1.4%. 

The western Siberian region of Russia is characterized by numerous intensive natural and anthropogenic sources of methane formation. These are marshes, tundra, permafrost, oil and gas deposits. In this region, flux FlCH4 varies widely both during the year and shorter time periods. From measurements carried out by Jagovkina et al. (2000) on the Yamal coastline in June 1996, the CH4 concentration in the atmosphere 

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Table 4.15. Methane emissions from different sources recalculated for carbon equivalent. From EPA (2001). Estimates of methane fluxes are given in 106 tC per year.

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