An evaluation of advanced baseline imager fire radiative power based wildfire emissions using carbon monoxide observed by the Tropospheric Monitoring Instrument across the conterminous United States Environmental Research Letters

Biomass-burning emissions (BBE) profoundly affect climate and air quality. BBE have been estimated using various methods, including satellite-based fire radiative power (FRP). However, BBE estimates show very large variability and the accuracy of emissions estimation is poorly understood due to the lack of good reference data. We evaluated fire emissions estimated using FRP from the Advanced Baseline Imager (ABI) on GOES-R (Geostationary Operational Environmental Satellites-R) by comparing with the Sentinel 5 Precursor TROPOspheric Monitoring Instrument (TROPOMI) Carbon Monoxide (CO) over 41 wildfires across the United States during July 2018—October 2019. All the ABI FRP-based CO and TROPOMI CO emissions were significantly correlated and showed a very good agreement with a coefficient of determination of 0.94 and an accuracy of 13–18%. We further reported a CO emission coefficient of 29.92 ± 2.39 g MJ−1 based on ABI FRP and TROPOMI CO, which can be used to directly estimate BBE from FRP observed from satellites. Based on the CO emission coefficient and ABI FRP, we finally estimated a monthly mean CO of 596 Gg across the Conterminous United States for June—September 2018. NA14NES4320003

生物质燃烧排放（Biomass-burning emissions, BBE）对气候与空气质量具有深远影响。当前学界已通过多种方法开展BBE估算，其中包括基于卫星的火辐射功率（Fire Radiative Power, FRP）法。然而，由于缺乏高质量参考数据，BBE的估算结果存在极大变异性，且排放估算的准确性尚未得到充分认知。本研究针对2018年7月至2019年10月美国境内的41起野火事件，将地球静止业务环境卫星-R系列（Geostationary Operational Environmental Satellites-R, GOES-R）搭载的先进基线成像仪（Advanced Baseline Imager, ABI）反演的FRP所估算的火排放数据，与哨兵5号前驱任务对流层监测仪（Sentinel 5 Precursor TROPOspheric Monitoring Instrument, TROPOMI）获取的一氧化碳（Carbon Monoxide, CO）观测数据进行对比，以此开展评估。结果显示，基于ABI FRP估算的CO排放与TROPOMI的CO观测数据呈显著相关，二者吻合度极佳，决定系数达0.94，估算精度为13%~18%。本研究进一步基于ABI FRP与TROPOMI CO数据，得到CO排放系数为29.92±2.39 g MJ⁻¹，该系数可直接通过卫星观测的FRP估算BBE。最后，依托该CO排放系数与ABI FRP数据，我们估算得到2018年6月至9月美国本土的月均CO排放量为596 Gg。NA14NES4320003