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Methane Emission in Large Cities

大城市之甲烷排放

並列摘要


The mixing ratio of atmospheric methane (CH4) over the two large cities of Osaka and Kyoto achieves its maximum in the central part of the city and decreases toward the suburbs, with the same distribution patterns for nonmethane hydrocarbons (NMHC) and carbon monoxide (CO). It is shown that CH4 is emitted from the same sources as NMHC and CO, whose contribution amounts to about 4% of the yearly mean of observed methane. The emission ratio of CH4 to total hydrocarbons is estimated to be 8.3±1.0%, calculated in terms of carbon number. The emission ratio of CH4 to CO is estimated to be 0.034±0.006 in volume.

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