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- W4255361451 abstract "Abstract. An integrated observation on aerosol aminiums was conducted in a coastal city (Shanghai) of eastern China, a nearby island (Huaniao Island) and over the Yellow Sea and East China Sea (YECS). Triethylaminium (TEAH+) was the most abundant aminium observed in Shanghai but not detected over the island and the open seas, suggesting its predominantly terrestrial origin. By contrast, relatively high concentrations of dimethylaminium (DMAH+) and trimethylaminium+diethylaminium (TMDEAH+) were measured over the ocean sites. Environmental factors, including boundary layer height (BLH), temperature, atmospheric oxidizing capacity and relative humidity, were found to be related to aminium concentrations. All the detected aminiums demonstrated the highest levels in winter in Shanghai, consistent with the lowest BLH, temperature and oxidizing capacity in this season. Aminiums mainly existed in fine particles and showed a bimodal distribution with two peaks at 0.18–0.32 μm and 0.56–1.0 μm, indicating that condensation and cloud processing were primary formation pathways for aminiums. Nonetheless, a unimodal distribution for aerosol aminiums was usually measured over the YECS or influenced mainly by the marine air-mass over the Huaniao Island, which was probably related to sea-spray aerosols that either contained primary aminiums or provided surface for heterogeneous reactions to form secondary aminiums. Terrestrial anthropogenic sources and marine biogenic sources were both important contributors for DMAH+ and TMDEAH+, and the latter exhibited a significantly higher TMDEAH+ to DMAH+ ratio. By using the mass ratio of methanesulfonate (MSA) to non-sea-salt SO42− as an indicator of marine biogenic source, we estimated that marine biogenic source contributed to 57–83 % and 29–38 % of aerosol aminiums over Huaniao Island in the summer of 2017 and autumn of 2016, respectively." @default.
- W4255361451 created "2022-05-12" @default.
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- W4255361451 date "2019-03-21" @default.
- W4255361451 modified "2023-10-15" @default.
- W4255361451 title "Characteristics and sources of aerosol aminiums over the eastern coast of China: Insights from the integrated observations in a coastal city, adjacent island and the marginal seas" @default.
- W4255361451 doi "https://doi.org/10.5194/acp-2019-107" @default.
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