生物地球化学循环
大气甲烷
甲烷
缺氧水域
背景(考古学)
环境科学
环境化学
温室气体
生态系统
生物圈
产甲烷
甲烷厌氧氧化
陆地生态系统
生态学
地球科学
化学
生物
地质学
古生物学
作者
Frank Keppler,Mihály Boros,Christian Frankenberg,Jos Lelieveld,Andrew McLeod,Anna Maria Pirttilä,Thomas Röckmann,Jörg‐Peter Schnitzler
摘要
Environmental context. Methane is an important greenhouse gas and its atmospheric concentration has drastically increased since pre-industrial times. Until recently biological methane formation has been associated exclusively with anoxic environments and microbial activity. In this article we discuss several alternative formation pathways of methane in aerobic environments and suggest that non-microbial methane formation may be ubiquitous in terrestrial and marine ecosystems. Abstract. Methane (CH4), the second principal anthropogenic greenhouse gas after CO2, is the most abundant reduced organic compound in the atmosphere and plays a central role in atmospheric chemistry. Therefore a comprehensive understanding of its sources and sinks and the parameters that control emissions is prerequisite to simulate past, present and future atmospheric conditions. Until recently biological CH4 formation has been associated exclusively with anoxic environments and methanogenic activity. However, there is growing and convincing evidence of alternative pathways in the aerobic biosphere including terrestrial plants, soils, marine algae and animals. Identifying and describing these sources is essential to complete our understanding of the biogeochemical cycles that control CH4 in the atmospheric environment and its influence as a greenhouse gas.
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