This study created a regional budget for methane (CH₄) for Northern Europe, Siberia, and northern North America, based on a mission inventories, biogeochemical models, and land-surface satellite data. Natural sink and sources (wetlands, termites, wildfires, soil oxidation, and geological sources) and anthropogenic sources (fossil fuel extraction, industry and transportation, waste, agriculture, and livestock) were included. During 2000–2015, the region was estimated to be a net source of 57.2 Tg CH₄ yr⁻¹, 40.8% of which was contributed by anthropogenic sources. Wetland emissions (33.9 Tg CH₄ yr⁻¹) were the largest sources in the region, followed by fossil fuel extraction, waste, and geological emissions. Comparisons with other estimates indicated an uncertainty of ±16.9 Tg CH₄ yr⁻¹ for wetland emissions and ±6.9 Tg CH₄ yr⁻¹ for anthropogenic emissions. Regional emissions reached a peak in 1988, troughs in 1996 and 2000, and then gradually increased to a maximum in 2015. The temporal patterns was attributable to variations of both anthropogenic and natural emissions. Spatial maps of CH₄ sources, sinks, and net emissions were constructed to identify “hot spots” of emissions and their variations. Theanalyses revealed a need for further clarification of emissions from freshwater, permafrost thawing, biomass burning, and fossil fuel exploitation.

这项研究基于任务清单，生物地球化学模型和地表卫星数据，为北欧，西伯利亚和北美北部创建了甲烷（CH ₄）区域预算。包括自然汇和源（湿地，白蚁，野火，土壤氧化和地质源）和人为源（化石燃料的提取，工业和运输，废物，农业和牲畜）。在2000–2015年期间，该地区的净来源估计为57.2 Tg CH ₄ yr ^-1，其中40.8％来自人为来源。湿地排放（33.9 Tg CH ₄年^-1）是该地区最大的污染源，其次是化石燃料的开采，废物和地质排放。与其它估计的比较表明±16.9 Tg为CH的不确定性₄年^-1和湿地排放±6.9 Tg的CH ₄年^-1为人为排放量。区域排放量在1988年达到顶峰，在1996年和2000年达到谷底，然后在2015年逐渐增加到最大值。时间格局归因于人为排放量和自然排放量的变化。CH _4的空间图构造源，汇和净排放量以识别排放量及其变化的“热点”。分析表明有必要进一步澄清淡水，多年冻土融化，生物质燃烧和化石燃料开采的排放。