Ambient nitro-aromatic compounds – biomass burning versus secondary formation in rural China
نویسندگان
چکیده
Abstract. Nitro-aromatic compounds (NACs) were measured hourly at a rural site in China during wintertime to monitor the changes due local and regional impacts of biomass burning (BB). Concurrent continuous measurements concentrations 16 NACs gas particle phases performed with time-of-flight chemical ionization mass spectrometer (CIMS) equipped Filter Inlet for Gases AEROsols (FIGAERO) unit using iodide as reagent ion. accounted <2 % concentration organic matter (OM) total particulate (PM), but these can reach high 1000 ng m?3 (299 avg), suggesting that they may contribute significantly radiative forcing effects atmospheric particles. Levels gas-phase highest daytime (15:00–16:00 time, LT), smaller night-time peak around 20:00 LT. Box-model simulations showed this occurred because rate NAC production from sources exceeded loss, which mainly via OH reaction lesser degree photolysis. Data gathered extended periods contributions primary BB (resulting 40 %–60 increases concentrations) used characterize individual respect gas–particle partitioning secondary processes (i.e. photochemical smog). On days without extensive BB, formation was dominant source NACs, levels correlated strongly ambient ozone concentration. Analyses regionally aged plumes sampled on allowed precursors such phenol catechol be linked their derivatives nitrophenol nitrocatechol). Correlation analysis time resolution data box-model simulation results constrained relationships between demonstrated contribution processes. Furthermore, 13 NACS classified according or process. Primary emission (accounting 60 %–70 5 studied also significant source. Photochemical smog thus has important brown carbon even dominated by air pollution China.
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ژورنال
عنوان ژورنال: Atmospheric Chemistry and Physics
سال: 2021
ISSN: ['1680-7316', '1680-7324']
DOI: https://doi.org/10.5194/acp-21-1389-2021