摘要
甲烷是重要的温室气体之一,其单分子增温潜势约是CO2的62倍,目前大气CH4的浓度约为1.7ppm。甲烷的主要自然源包括反刍动物和一些昆虫的肠发酵及淹水土壤的有机物的厌氧分解。人类源包括煤燃烧、天然气泄漏、热带植物燃烧及垃圾填埋场.包括垃圾填埋场在内,土壤的CH4排放量约占全球CH4产生量的45%。
Methane absorbs infrared radiation,thus trapping heat and contributing to global warming.On a mass basis,the global warming potential of methane on a 20-yr time horizon is estimated to be 62 times that of carbon dioxide.The current atmospheric methane concentration is about 1.7 part per million(vol/vol).The Major natural sources of atmospheric methane include enteric fermentation in ruminants and some insects,and the anaerobic decomposition of organic matter in waterlogged soils.Anthropogenic sources include coal burning,leakage of natural gas from pipelines,burning of plant matter in the tropics,and municipal landfill sites.Including landfll sites,soils are estimated to account for about 45% of global methane production.The major sink for atmospheric methane is through chemical reaction with hydroxyl radical in the troposphere.However,oxidation of methane by soils is also a significant sink,representing about 10% of the total sink.
出处
《沈阳教育学院学报》
2004年第1期132-134,共3页
Journal of Shenyang College of Education
