Impacts of aerosol direct effects on tropospheric ozone through changes in atmospheric dynamics and photolysis rates

Atmospheric Chemistry and Physics
Jia XingJiming Hao

Abstract

Aerosol direct effects (ADEs), i.e., scattering and absorption of incoming solar radiation, reduce radiation reaching the ground and the resultant photolysis attenuation can decrease ozone (O3) formation in polluted areas. One the other hand, evidence also suggests that ADE-associated cooling suppresses atmospheric ventilation, thereby enhancing surface-level O3. Assessment of ADE impacts is thus important for understanding emission reduction strategies that seek co-benefits associated with reductions in both particuate matter and O3 levels. This study quantifies the impacts of ADEs on tropospheric ozone by using a two-way online coupled meteorology and atmospheric chemistry model, WRF- CMAQ, using a process analysis methodology. Two mani-festations of ADE impacts on O3 including changes in atmospheric dynamics (ᐃDynamics) and changes in photolysis rates (∆Photolysis) were assessed separately through multiple scenario simulations for January and July of 2013 over China. Results suggest that ADEs reduced surface daily maxima 1 h O3 (DM1O3) in China by up to 39μgm-3 through the combination of ∆Dynamics and ∆Photolysis in January but enhanced surface DM1O3 by up to 4μgm-3 in July. Increased O3 in July is largely attributed to ∆Dyn...Continue Reading

References

May 6, 2008·The Science of the Total Environment·Jun XuWei Wang
Aug 17, 2012·Journal of Environmental Sciences (China)·Jun XuYoujiang He
Jan 28, 2017·The Science of the Total Environment·Jiandong WangJiming Hao

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Citations

May 5, 2020·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·G H BernhardC C White
Sep 25, 2020·Proceedings of the National Academy of Sciences of the United States of America·Haikun WangJohn S Evans
Feb 28, 2021·The Science of the Total Environment·Shuman ZhaoYuesi Wang
Apr 20, 2021·Journal of Geophysical Research. Atmospheres : JGR·Jia JungSojin Lee
Oct 11, 2019·Environmental Science & Technology·Claire E BuysseDaniel A Jaffe
Nov 23, 2021·Atmospheric Chemistry and Physics·Shuping ZhangHong He

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Methods Mentioned

BETA
light scattering

Software Mentioned

SimNF
SimBL
SimSF

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