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@ARTICLE{Guo:857247,
author = {Guo, Hongyu and Otjes, Rene and Schlag, Patrick and
Kiendler-Scharr, Astrid and Nenes, Athanasios and Weber,
Rodney J.},
title = {{E}ffectiveness of ammonia reduction on control of fine
particle nitrate},
journal = {Atmospheric chemistry and physics},
volume = {18},
number = {16},
issn = {1680-7324},
address = {Katlenburg-Lindau},
publisher = {EGU},
reportid = {FZJ-2018-06477},
pages = {12241 - 12256},
year = {2018},
abstract = {In some regions, reducing aerosol ammonium nitrate (NH4NO3)
concentrations may substantially improve air quality. This
can be accomplished by reductions in precursor emissions,
such as nitrogen oxides (NOx) to lower nitric acid (HNO3)
that partitions to the aerosol, or reductions in ammonia
(NH3) to lower particle pH and keep HNO3 in the gas phase.
Using the ISORROPIA-II thermodynamic aerosol model and
detailed observational data sets, we explore the sensitivity
of aerosol NH4NO3 to gas-phase NH3 and NOx controls for a
number of contrasting locations, including Europe, the
United States, and China. NOx control is always effective,
whereas the aerosol response to NH3 control is highly
nonlinear and only becomes effective at a thermodynamic
sweet spot. The analysis provides a conceptual framework and
fundamental evaluation on the relative value of NOx versus
NH3 control and demonstrates the relevance of pH as an air
quality parameter. We find that, regardless of the locations
examined, it is only when ambient particle pH drops below an
approximate critical value of 3 (slightly higher in warm and
slightly lower in cold seasons) that NH3 reduction leads to
an effective response in PM2.5 mass. The required amount of
NH3 reduction to reach the critical pH and efficiently
decrease NH4NO3 at different sites is assessed. Owing to the
linkage between NH3 emissions and agricultural productivity,
the substantial NH3 reduction required in some locations may
not be feasible. Finally, controlling NH3 emissions to
increase aerosol acidity and evaporate NH4NO3 will have
other effects, beyond reduction of PM2.5 NH4NO3, such as
increasing aerosol toxicity and potentially altering the
deposition patterns of nitrogen and trace nutrients.},
cin = {IEK-8},
ddc = {550},
cid = {I:(DE-Juel1)IEK-8-20101013},
pnm = {243 - Tropospheric trace substances and their
transformation processes (POF3-243)},
pid = {G:(DE-HGF)POF3-243},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000442577800001},
doi = {10.5194/acp-18-12241-2018},
url = {https://juser.fz-juelich.de/record/857247},
}