Abstract
AbstractThe refined source apportionment of ammonium (NH4+), especially for biomass burning emissions, is unclear. Hourly resolution δ15N‐NH4+ values for three winter haze episodes (EP1–EP3) were determined in the North China Plain (NCP) in 2019 to identify and quantify the contribution of biomass burning. A reasonable source‐resolved structure of NH4+ was obtained after using the corrected source signatures of 15N and considering biomass burning emissions. The time‐series variation in biomass burning and vehicle sources identified by δ15N was more reasonable and matched better with their tracers (e.g., levoglucosan). The non‐negligible contribution of biomass burning in the NCP was found and contributed 13.0% ± 11.4% to NH4+ in haze episodes, but in special stages was as high as 29% ± 11% in local emission of EP1 and 23% ± 15% in southwest transportation of EP2. The redistribution of NH4+ sources further emphasize the contribution of biomass burning to haze episodes, as its contribution to PM2.5 increased up to 5% (without considering SO42− and NO3−). Considering NH4+ uniqueness in the formation of new particles, the role of biomass burning during haze episodes should be considered. This study indicates that further studies need to be conducted to reduce biomass burning emissions in the NCP.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.