E42 Reconstruction of Non-agricultural Ammonia Emission Inventory Based on Isotopic Source Apportionment in China

Tuesday, 30 January 2024
Hall E (The Baltimore Convention Center)
Weihua Chen, Jinan University, Guangzhou, Guangdong, China; Institute for Environmental and Climate Research, Guangzhou, Guangdong, China; and F. Yan and X. Wang

Isotopic source apportionment results revealed that non-agricultural sectors are a significant source of ammonia (NH3) emissions, particularly in urban areas. Unfortunately, non-agricultural sources have been substantially underrepresented in the current anthropogenic NH3 emission inventories (EIs). Therefore, based on the isotopic source apportionment results and the emission ratios of carbon monoxide (CO) and NH3, this study reconstructed a gridded EI of non-agricultural NH3 in China for the year 2016. The isotope-corrected non-agricultural NH3 emissions in China were estimated to be 4370 Gg, with the contribution of non-agricultural sectors increasing from 7% to 31%. Spatially, high amounts of non-agricultural NH3 emissions were mainly concentrated in China's highly urbanized and densely inhabited regions. More importantly, according to simulation from the WRF-Chem model driven by the isotope-corrected NH3 EI compared to the original NH3 EI, the average biases for the surface concentrations and dry deposition flux of reduced nitrogen (NHx = gaseous NH3 + particulate NH4+) have decreased by 23% and 31%, respectively. Overall, this study develops a preliminary and sound estimate of previously underestimated non-agricultural NH3 emissions and offers a comprehensive and accurate NH3 EI for the efficient prevention and control of air pollution in China.
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