Impacts of Heatwaves on Characteristics of Atmospheric Methylglyoxal in a Suburban Area in Eastern China

作者：Haoyu Liu, Tengyu Liu, Yuanyuan Li, Aoqi Ge, Lei Wang, Shiyi Lai, Guangdong Niu, Junchao Yin, Xueyu Zhou, Yuliang Liu, Jiaping Wang, Qiaozhi Zha, Ximeng Qi, Wei Nie, Xuguang Chi, Sijia Lou, Xin Huang, Yanli Zhang, Wei Song, Xinming Wang, Aijun Ding · 发表于：Journal of Geophysical Research Atmospheres · 年份：2025 · DOI：10.1029/2025jd044284 · 被引用次数：4 · 研究领域：Atmospheric chemistry and aerosols、Atmospheric and Environmental Gas Dynamics、Vehicle emissions and performance

Abstract Methylglyoxal (Mgly) is a ubiquitous yet poorly constrained atmospheric volatile organic compound significantly contributing to the formation of ozone and secondary organic aerosols. Global warming increases heatwaves frequency, affecting sources and sinks of Mgly. Thus, studies on Mgly observations during heatwaves become increasingly urgent. Here, we combined field measurements using Vocus proton transfer reaction time‐of‐flight mass spectrometry (Vocus PTR‐ToF‐MS), box model, and the Weather Research and Forecasting model with Chemistry (WRF‐Chem) to investigate the impacts of heatwaves on Mgly at a suburban site in eastern China during a prolonged heatwave influenced summer in 2022. After verifying that Vocus PTR‐ToF‐MS accurately detects Mgly and eliminating ion fragmentation artifacts of isoprene, we discovered that the heatwave doubled Mgly concentrations. This was attributed to a significant rise of isoprene—the dominant precursor of Mgly as confirmed by box modeling. The heatwave also altered photolysis and oxidation of Mgly and emission characteristics of isoprene, leading to an earlier peak and then a sudden drop of Mgly in the morning. This was different from the consistent peaks with air temperatures observed during non‐heatwave period. The concentrations of Mgly and isoprene showed positive correlations with air temperatures below 33°C, whereas both species' concentrations decline as temperatures exceeded 35°C. Additionally, WRF‐Chem underestimated isop...