Climate Research Division, Environment and Climate Change Canada, Toronto, Ontario M3H 5T4, Canada.
Air Quality Research Division, Environment and Climate Change Canada, Toronto, Ontario M3H 5T4, Canada.
Environ Sci Technol. 2020 Dec 1;54(23):14899-14909. doi: 10.1021/acs.est.0c04117. Epub 2020 Nov 10.
The provinces of Alberta and Saskatchewan account for 70% of Canada's methane emissions from the oil and gas sector. In 2018, the Government of Canada introduced methane regulations to reduce emissions from the sector by 40-45% from the 2012 levels by 2025. Complementary to inventory accounting methods, the effectiveness of regulatory practices to reduce emissions can be assessed using atmospheric measurements and inverse models. Total anthropogenic (oil and gas, agriculture, and waste) emission rates of methane from 2010 to 2017 in Alberta and Saskatchewan were derived using hourly atmospheric methane measurements over a six-month winter period from October to March. Scaling up the winter estimate to annual indicated an anthropogenic emission rate of 3.7 ± 0.7 MtCH/year, about 60% greater than that reported in Canada's National Inventory Report (2.3 MtCH). This discrepancy is tied primarily to the oil and gas sector emissions as the reported emissions from livestock operations (0.6 MtCH) are well substantiated in both top-down and bottom-up estimates and waste management (0.1 MtCH) emissions are small. The resulting estimate of 3.0 MtCH from the oil and gas sector is nearly twice that reported in Canada's National Inventory (1.6 MtCH).
阿尔伯塔省和萨斯喀彻温省占加拿大油气部门甲烷排放量的 70%。2018 年，加拿大政府出台了甲烷法规，目标是到 2025 年将该部门的排放量在 2012 年的基础上减少 40-45%。除清单核算方法外，还可以利用大气测量和反演模型评估减少排放的监管实践的有效性。利用 2010 年至 2017 年 10 月至 3 月为期六个月的冬季每小时大气甲烷测量数据，得出了阿尔伯塔省和萨斯喀彻温省的甲烷人为（石油和天然气、农业和废物）总排放量。将冬季估算值扩大到全年，表明人为排放率为 3.7±0.7MtCH/年，比加拿大国家清单报告（2.3MtCH）中报告的排放量高出约 60%。这种差异主要与石油和天然气部门的排放有关，因为牲畜养殖（0.6MtCH）的报告排放量在自上而下和自下而上的估算以及废物管理（0.1MtCH）的排放量都得到了很好的证实。石油和天然气部门的排放量估计为 3.0MtCH，几乎是加拿大国家清单报告的两倍（1.6MtCH）。
