Hong Kong and Shanghai Winter Sampling Campaign, November 2017 – February 2018

The Hong Kong and Shanghai Winter Sampling Campaign was carried out at the Hong Kong Cross-harbor Tunnel and two sites in Shanghai simultaneously, led by Professor Hai Guo from Hong Kong Polytechnic University. The project focused on the measurement of emission characteristics, chemical transformation, and impacts on regional air quality of urban plumes from four major population centres in Brisbane, Singapore and China with different energy use and/or meteorology. This was a joint project between Professor Lidia Morawska from Queensland University of Technology, Professor Raj Bala from National University of Singapore, Professor Yingjun Chen from Tongji University, and Professor Hai Guo from the Hong Kong Polytechnic University, and was funded by the Asian Universities Cluster Centre of Excellence in Civil Engineering.

The measurements included canister sampling for volatile organic compounds (VOCs), DNPH cartridges for carbonyl compounds, real-time monitoring of weather conditions, trace gases and VOCs, SMPS for particle number concentrations and new particle formation, NAIS for sampling of 2-5 nm particles, as well as the first commercialized Thermal-Desorption Aerosol Gas-chromatograph (TAG-GC)-Time of Flight (ToF)-Mass Spectrometer (MS) for organic species in aerosols, and High-Resolution-ToF-Aerosol Mass Spectrometer (HR-ToF-AMS) for total organics, sulphates, nitrates, ammonium and chloride in aerosols. More than 20 research students and researchers participated in the sampling campaigns. This will be followed by a comprehensive analysis of the chemical database using a combination of statistical analysis of field observations, mesoscale meteorological simulations, diagnostic and prognostic box models, for example, an observation-based box model, an emission-based model, and chemical transport models. The data collected will significantly improve our understanding of photochemical formation of ozone (O3) and secondary organic aerosols (SOA), and their transport mechanisms in different regions with complex interaction of meteorology and chemistry. The scientific findings will have direct policy implications for reducing O3 and SOA pollution and visibility degradation in the four different population centres. This campaign is a part of the project “Comparative study of emission, transformation and effects of urban pollution from Australia, Singapore, Shanghai and Hong Kong”. Up to now, three high-quality journal papers were generated from this project and more are in preparation for submission in 2018