Climate-driven biogenic emissions alleviate the impact of human-made emission reductions on O<sub>3</sub> control in the Pearl River Delta region, southern China
<p>Ozone (O<span class="inline-formula"><sub>3</sub></span>) concentrations in the Pearl River Delta (PRD) during summer are typically low and often overlooked. However, integrated observational data indicate a consistent increase in summer O<span class=&qu...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2025-08-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://acp.copernicus.org/articles/25/8859/2025/acp-25-8859-2025.pdf |
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| Summary: | <p>Ozone (O<span class="inline-formula"><sub>3</sub></span>) concentrations in the Pearl River Delta (PRD) during summer are typically low and often overlooked. However, integrated observational data indicate a consistent increase in summer O<span class="inline-formula"><sub>3</sub></span> levels over recent decades (<span class="inline-formula">+</span>0.96 ppb yr<span class="inline-formula"><sup>−1</sup></span>), contradicting China's efforts to reduce anthropogenic emissions. Our dynamically calculated natural emissions show that biogenic volatile organic compound (BVOC) emissions in the region significantly increased between 2001 and 2020, primarily due to climate change and alterations in vegetation cover, with climate-driven BVOC emissions accounting for approximately 80 % of the increase. Furthermore, parallel simulations using the Weather Research and Forecasting–Community Multiscale Air Quality (WRF–CMAQ) model indicate that climate-driven BVOC emissions, by enhancing atmospheric oxidative capacity and accelerating O<span class="inline-formula"><sub>3</sub></span> formation, have weakened or even offset the benefits of anthropogenic emission reductions, contributing 6.2 ppb to O<span class="inline-formula"><sub>3</sub></span> formation and leading to an unexpected rise in O<span class="inline-formula"><sub>3</sub></span> levels. This study enhances our understanding of the mechanisms behind natural emissions in urban O<span class="inline-formula"><sub>3</sub></span> formation under climate change and provides insights for future O<span class="inline-formula"><sub>3</sub></span> pollution control strategies.</p> |
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| ISSN: | 1680-7316 1680-7324 |