Biomass burning from wildfires is a significant global source of aerosol and trace gases which impact air quality, tropospheric and stratospheric composition, and climate. During the summer of 2019, wildfire activity in central and eastern Siberia occurred during the Fire Influence on Regional to Global Environments and Air Quality (FIREX-AQ) campaign conducted in the United States between July 24 and September 6, 2019. Ground-based lidar observations from the Autonomous Mobile Ozone Lidar for Tropospheric Experiments (AMOLITE) system in Alberta, Canada retrieved frequent ozone (O₃) and aerosol lamina in the free troposphere during the campaign. Simulated data from NASA's GEOS Composition Forecast (GEOS-CF) coupled chemistry meteorology model, TROPOspheric Monitoring Instrument (TROPOMI), and ground-based in situ measurements were applied to define the trans-Pacific and trans-Arctic transport pathways of Siberian biomass burning emissions resulting in the enhanced O₃ and aerosol lamina observed by AMOLITE in western Canada. Siberian wildfires had some influence on North American air quality resulting in enhancements of surface carbon monoxide (CO) and fine particulate matter (PM_2.5) concentrations in western Canada; however, minimal increases in surface-level O₃ were measured as well as modeled by GEOS-CF. The impact in western Canada was larger in the free troposphere, demonstrated by GEOS-CF modeled and AMOLITE observed O₃ lamina >20 ppb above background values and coincident model-predicted PM_2.5 lamina >30 μg m⁻³. This study demonstrated that the Siberian biomass burning emissions in the summer of 2019 impacted tropospheric composition in western Canada, and potentially could have influenced areas in the vicinity of FIREX-AQ airborne and ground-based measurements in the United States, and should be considered in future studies.

野火燃烧的生物质是影响空气质量，对流层和平流层组成以及气候的重要的全球气溶胶和微量气体来源。在2019年夏季，西伯利亚中部和东部的野火活动发生在2019年7月24日至9月6日在美国进行的火灾对区域对全球环境和空气质量的影响（FIREX-AQ）活动中。来自加拿大艾伯塔省对流层自主移动臭氧激光雷达（AMOLITE）系统的观测结果，发现了频繁发生的臭氧（O ₃）和运动期间在对流层中的气溶胶层。来自NASA的GEOS成分预测（GEOS-CF）耦合化学气象模型，TROPOsphere监测仪（TROPOMI）和地面实地测量的模拟数据被用于定义西伯利亚生物质燃烧排放的跨太平洋和跨北极运输路径导致加拿大西部AMOLITE观察到O ₃和气溶胶层的增强。西伯利亚的野火对北美的空气质量产生了一些影响，导致加拿大西部的表面一氧化碳（CO）和细颗粒物（PM _2.5）浓度增加。但是，表面能级O _3的增加最小由GEOS-CF进行测量和建模。加拿大西部地区在自由对流层的影响更大，这由GEOS-CF模型证实，AMOLITE观测到的O ₃叶片比背景值高出20 ppb，同时模型预测的PM _2.5叶片也超过了30μgm ^-3。这项研究表明，2019年夏季西伯利亚生物质燃烧排放物影响了加拿大西部的对流层组成，并可能影响了美国FIREX-AQ机载和地面测量附近的地区，应考虑在未来的研究。