Ammonia emissions from biomass burning in the continental United States

Abstract This study quantifies ammonia (NH 3 ) emissionsfrom biomass burning from 2005 to 2015 across the continental US (CONUS) and compares emissionsfrom biomass burning with the US Environmental Protection Agency (EPA) National Emissions Inventory(NEI), the Fire Inventory from the National Center for Atmospheric Research (FINN) and the Global Fire EmissionsDatabase (GFED). A statistical regression model was developed in order to predict NH 3 emissionsfrom biomass burning using a combination of fire properties and meteorological data. Satellite data were used to evaluate the annual fire strength and frequency as well as to calculate the total NH 3 emissionsacross the CONUS. The results of this study showed the total fire number has decreased, while the total yearly burn area and the average fire radiative power has increased. The average annual NH 3 emissionsfrom biomass burning from this study, on a national scale, were approximately 5.4e8 ± 3.3e8 kg year −1 . When comparing the results of this study with other emission inventories, it was found that ammonia emissionsestimated by the NEI were approximately a factor of 1.3 lower than what was calculated in this study and a factor of 1.1 lower than what was modeled using the statistical regression model for 2010–2014. The calculated NH 3 emissionsfrom biomass burning were a factor of 5.9 and a factor of 13.1 higher than the emissionsfrom FINN and the GFED, respectively. The modeled NH 3 emissionsfrom biomass burning were a factor of 5.0 and a factor of 11.1 higher than the emissionsfrom FINN and the GFED, respectively. As the climate continues to change, the pattern (frequency, intensity and magnitude) of fires across the US will also change, leading to changes in NH 3 emissions. The statistical regression model developed in this study will allow prediction of NH 3 emissionsassociated with climate change.