Abstract. An integrated observation of aerosol aminiums was
conducted in a coastal city (Shanghai) in eastern China, a nearby island
(Huaniao Island), and over the Yellow Sea and East China Sea (YECS).
Triethylaminium (TEAH+) was abundant over 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, indicating the significant marine source
contribution. 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 and temperature 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 the main formation pathways for aminiums in analogy with
NH4+ and non-sea-salt SO42- (nss-SO42-).
Nonetheless, a unimodal distribution for aerosol aminiums was usually
measured over the YECS or over Huaniao Island when influenced mainly by
the marine air mass, which suggested that aminiums in marine aerosols may
undergo different formation pathways from those on the land. 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 nss-SO42- as an indicator of
marine biogenic source, we estimated that marine biogenic source contributed
to 26 %–31 % and 53 %–78 % of aerosol aminiums over Huaniao Island in the
autumn of 2016 and summer of 2017, respectively. Due to the important role
of atmospheric amines in new particle formation, the estimation results
highlighted the importance of marine biogenic emission of amines on the
eastern coast of China, especially in summer.
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