Identification of long-term evolution of ozone sensitivity to precursors based on two-dimensional mutual verification
| Autor: | Huihong Luo, Qingyan Fu, Leifeng Yang, Zibing Yuan, Yusen Duan, Yiran Wang, Yuanqian Xu |
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| Rok vydání: | 2020 |
| Předmět: |
Ozone pollution
Pollution Environmental Engineering Ozone 010504 meteorology & atmospheric sciences media_common.quotation_subject 010501 environmental sciences Atmospheric sciences 01 natural sciences chemistry.chemical_compound chemistry Monitoring data Functional space Environmental Chemistry Environmental science Sensitivity (control systems) Tropospheric ozone Waste Management and Disposal NOx 0105 earth and related environmental sciences media_common |
| Zdroj: | The Science of the total environment. 760 |
| ISSN: | 1879-1026 |
| Popis: | Tropospheric ozone pollution has been continuously worsening in China during the past decade. Identification of long-term evolution of ozone sensitivity to precursors is essential to evaluating the impact of emission reduction measures on ozone pollution. Traditional observation-based model and 3-d numerical model are not suitable for analyzing long-term variation of ozone sensitivity to precursors. In this study, by transforming the conventional ozone isopleth plot into a VOCR isopleth plot in the functional space of NOx and ozone concentrations, we developed a novel approach to identify ozone sensitivity to precursors by simply using long-term monitoring data of ozone, NOx and temperature. This approach estimated ozone formation regimes (OFR) by ozone sensitivity to NOx and temperature separately, and the convergence of OFR serves as a way of mutual verification. We found that ozone formation was generally in the VOCR-limited or transitional regime in Shanghai, the largest metropolitan area in China. However, OFR was shifted to NOx-limited at Pudong station during 2017–19 due much to the stringent NOx emission control. OFR was also shifted to NOx-limited along with the increasing temperature. When temperature was over 30 °C, Shanghai was mostly in a NOx-limited OFR. This highlights that the NOx emission control measures need to be strengthened to reduce peak ozone levels more efficiently. Jinshan station exhibited a different trend with OFR shifted to VOCR-limited in 2017–19, which proved the effectiveness of VOCs emission control on petrochemical sector. However, OFR was shifted to NOx-limited when temperature was over 30 °C, suggesting more stringent VOCs emissions control should be targeted on days with higher temperature. |
| Databáze: | OpenAIRE |
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