Global Perspective of Drought Impacts on Ozone Pollution Episodes
Research output: Contribution to journal › Journal article › Research › peer-review
Ozone (O3) pollution threatens global public health and damages ecosystem productivity. Droughts modulate surface O3through meteorological processes and vegetation feedbacks. Unraveling these influences is difficult with traditional chemical transport models. Here, using an atmospheric chemistry-vegetation coupled model in combination with a suite of existing measurements, we investigate the drought impacts on global surface O3and explore the main driving processes. Relative to the mean state, accelerated photochemical rates dominate the surface O3enhancement during droughts except for eastern U.S. and western Europe, where reduced stomatal uptakes make comparable contributions. During 1990-2012, the simulated frequency of O3pollution episodes in western Europe decreases greatly with a negative trend of -5.5 ± 6.6 days per decade following the reductions in anthropogenic emissions if meteorology is fixed. However, such decreased trend is weakened to -2.1 ± 3.8 days per decade, which is closer to the observed trend of -2.9 ± 1.1 days per decade when year-to-year meteorology is applied because increased droughts alone offset 43% of the effects from air pollution control. Our results highlight that more stringent controls of O3precursors are necessary to mitigate the higher risks of O3pollution episodes by more droughts in a warming world.
Original language | English |
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Journal | Environmental Science and Technology |
Volume | 56 |
Issue number | 7 |
Pages (from-to) | 3932-3940 |
Number of pages | 9 |
ISSN | 0013-936X |
DOIs | |
Publication status | Published - 2022 |
Externally published | Yes |
Bibliographical note
Funding Information:
This work was jointly supported by the National Natural Science Foundation of China (grant no. 41975155) and Jiangsu Science Fund for Distinguished Young Scholars (grant no. BK20200040). R.S. acknowledges grants RYC2020-029216-I and CEX2018-000794-S funded by MCIN/AEI/10.13039/501100011033 and by “ESF Investing in your future”. We would like to thank the editor and four anonymous reviewers for their constructive comments which helped improve the quality of the paper.
Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.
- chemistry-vegetation model, drought, meteorological processes, ozone pollution, vegetation feedbacks
Research areas
ID: 305123140