Troposphere methane budget

Finlayson-Pitts BJ, Ezell MJ, Jayaweera TM, et al. 1992. Kinetics of the reactions of OH with methyl chloroform and methane implications for global tropospheric OH and the methane budget. 

The total flux of methane into the stratosphere, 60 Tg/yr, combines with the rate of CH4 oxidation by OH to give a total sink strength of 400 Tg/yr. This agrees approximately with the global emission estimates of Table 4-7. Although methane has been observed to increase in the troposphere, the budget must be about balanced since the increase is slow. If we take a value of 400 Tg/yr as representative for ( Ch4 ch4 the tropospheric residence time for methane is... 

In 1992, a complete mechanism for the oxidation of Ci and C2 hydrocarbons was formulated by the LACTOZ Steering Committee. The intended application is in global models for studies of methane oxidation and the tropospheric ozone budget. These studies have provided useful input to the Intergovernmental Panel on Climate Change (IPCC) assessment of the atmospheric chemistry of greenhouse gases. 

Crutzen PJ, Gidel LT. 1983. A two-dimensional photochemical model of the atmosphere. 2 The tropospheric budgets of the anthropogenic chlorocarbons, carbon monoxide, methane, chloromethane and the effect of various nitrogen oxides sources on the tropospheric ozone. Journal of Geophysical Research... 

The role of carbon dioxide in the Earth s radiation budget merits this interest in atmospheric CO2. There are, however, other changes of importance. The atmospheric methane concentration is increasing, probably as a result of increasing cattle populations, rice production, and biomass biuning (Crutzen, 1983). Increasing methane concentrations are important because of the role it plays in stratospheric and tropospheric chemistry. Methane is also important to the radiation budget of the world. 

Duce, R. A., 1978 Speculations on the budget of particulate and vapor phase non-methane organic carbon in the global troposphere. Pure and Appl. Geophys. 116, 244-273. 

---