Titlebook: Atmospheric Methane: Sources, Sinks, and Role in Global Change; M. A. K. Khalil (Professor and Director) Conference proceedings 1993 Sprin

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Confidential

Atmospheric Methane Concentrationsties at Cape Meares, Oregon (Rasmussen and Khalil, 1981). Since that time, more detailed and extensive data sets have allowed estimation of sources and sinks of methane on the global scale. As attempts are made to refine these estimates, the value of the current databases will be greatly increased,

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Biological Formation and Consumption of Methanemarine and freshwater sediments, and the gastrointestinal tract of animals (Whitman et al., 1992). This chapter describes the conditions that lead to biogenic methane formation in natural environments, the metabolic pathways and interactions that lead to methanogenesis, and the implications of these

兴奋过度

Stable Isotopes and Global Budgetssion the yearly 1% rise in lower tropospheric methane mixing ratios (e.g., Blake and Rowland, 1988), and we have adequate, basic global coverage of atmospheric methane latitudinal variation. Mesoscopically, we are able to roughly estimate the various source strengths, e.g., from wetlands, agricultur

MAZE

Methane Sinks Distributionear. Most of the methane is removed by reacting with tropospheric OH radicals; lesser amounts are removed by soils and stratospheric oxidation by OH, O(.D), and minor reactions. This chapter is on the removal rate of CH. and its variability in space and time.

虚弱

Sources of Methane: An Overviewe who want to reduce methane in the atmosphere or prevent it from increasing, controlling the sources is perhaps the only practical approach. Accordingly,.a significant portion of this book is devoted to estimating the global and regional emission rates. The purpose of this chapter is to introduce t

prosperity

Ruminants and Other Animalsnt animal contribution to atmospheric methane has been recognized for some time. Approximately 95 percent of animal methane emissions are accounted for by ruminants. The emphasis in this paper will therefore be primarily focused on these animals.

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