Journal
ENVIRONMENTAL POLLUTION
Volume 288, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2021.117712
Keywords
Nitrate; NO2 andO(3); Aerosol liquid water content (ALWC); PM2.5; Ammonia
Categories
Funding
- National Key R&D Plan, Ministry of Science and Technology of China (Mechanism and chemical process characterization of atmospheric particulate matter multi-isotope fractionation) [2017YFC0212703]
- National Natural Science Foundation of China [41773117, 41325014]
- Institute of Eco-Chongming
- ECNU Happiness Flower
Ask authors/readers for more resources
This study shows that N2O5 hydrolysis is an important pathway for nitrate formation in Chinese megacities, especially during haze episodes, as demonstrated by measurements and simulations.
Nitrate, as one of the major components of tropospheric aerosols, plays a crucial role in winter haze formation. While, the formation mechanism of the high production of nitrate in Chinese megacities is still not fully understood. To quantify the contributions of major formation pathways to nitrate, airborne particles in Xi'an, inland China during the winter of 2017 were measured and analyzed for the water-soluble ions and stable nitrogen/oxygen isotope compositions of nitrate in PM2.5, followed by a WRF-Chem model simulation. The oxygen isotopic results indicated that N2O5 hydrolysis was an important formation pathway for the daytime nitrate in the haze episodes. The model simulation further revealed that N2O5 hydrolysis contribution increased from 8.2% to 20.5% of the total nitrate over 14:00-16:00 p.m., clearly showing that N2O5 formation followed by a heterogeneous hydrolysis to nitrate can effectively proceed in daytime under the abundantly co-existing O-3, NO2 and NH3 conditions.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available