1,- 1Research Center for Energy and Environment, IMT Nord Europe, Douai, France
- 2Department of Chemistry, National Central University, Taoyuan, Taiwan
- 3Center for Environmental Monitoring and Technology, National Central University, Taoyuan, Taiwan
- 4Department of Atmospheric Sciences, National Central University, Taoyuan, Taiwan
- 5Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan
Tropospheric ozone (O₃) is a key greenhouse gas that adversely affects human health, ecosystems, and climate; the economic cost associated with ozone pollution worldwide is already substantial and tropospheric ozone concentrations are projected to increase under future climate change scenarios, particularly in Southeast Asia. Ambient O3 concentrations are driven by various physicochemical processes including air mass transport, net chemical in-situ production, P(O3), and dry deposition, but the chemistry driving P(O3) is highly complex and characterized by a nonlinear set of photochemical reactions involving nitrogen oxides (NOx = NO + NO2) and volatile organic compounds (VOCs). The inherit uncertainty of estimating P(O3) limits our understanding of the tropospheric ozone budget, i.e. distinguishing between locally-produced ozone and transported pollution, while measuring P(O3) in-situ would provide an important constraint on the ozone budget.
As part of the bilateral France-Taiwan OSEAMS (tropospheric Ozone in Southeast Asia: budget and Mitigation Strategies) project, a five-week field campaign was conducted in a highly polluted urban-industrial area of Kaohsiung, Taiwan. An Ozone Production Rate (OPR) instrument that measures P(Ox) [Ox=O3+NO2], as well as complementary instruments such as a Proton Transfer Reaction-Mass Spectrometer, were deployed next to existing Taiwan-EPA and PAMS (Photochemical Assessment Monitoring Stations) stations. In this study, we present preliminary results including measurements of VOCs, NOx and ozone production rates. We discuss the diurnal variability of these measurements and provide first insights into the contribution of in-situ O3 production to ambient O3 levels, as well as the main chemical pathways of ozone formation affecting an industrial-urban area in southern Taiwan.
Acknowledgments. This work was performed as part of the OSEAMS project, funded by the French National Research Agency (ANR) and the National Science and Technology Council (NSTC) in Taiwan.
How to cite: Dusanter, S., Ferrand, B., Lee, Y.-H., Jamar, M., Wang, J.-L., Lin, N.-H., Griffith, S., and Tomas, A.: Experimental investigation of the ozone budget in Taiwan during the OSEAMS campaign, EGU General Assembly 2026, Vienna, Austria, 3–8 May 2026, EGU26-16634, https://doi.org/10.5194/egusphere-egu26-16634, 2026.
