Simultaneous Detection of Alkylamines in the Surface Ocean and Atmosphere of the Antarctic Sympagic Environment

Dall’Osto, M; Airs, RL; Beale, R; Cree, C; Fitzsimons, MF; Beddows, D; Harrison, RM; Ceburnis, D; O’Dowd, C; Rinaldi, M; Paglione, M; Nenes, A; Decesari, S; Simó, R. 2019 Simultaneous Detection of Alkylamines in the Surface Ocean and Atmosphere of the Antarctic Sympagic Environment. ACS Earth and Space Chemistry. https://doi.org/10.1021/acsearthspacechem.9b00028

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Abstract/Summary

Measurements of alkylamines from seawater and atmospheric samples collected simultaneously across the Antarctic Peninsula, South Orkney and South Georgia Islands are reported. Concentrations of mono-, di-, and trimethylamine (MMA, DMA, and TMA, respectively), and their precursors, the quarternary amines glycine betaine and choline, were enhanced in sympagic seawater samples relative to ice-devoid pelagic ones, suggesting the microbiota of sea ice and sea ice-influenced ocean is a major source of these compounds. Primary sea-spray aerosol particles artificially generated by bubbling seawater samples were investigated by aerosol time-of-flight mass spectrometry (ATOFMS) of single particles; their mixing state indicated that alkylamines were aerosolized with sea spray from dissolved and particulate organic nitrogen pools. Despite this unequivocal sea spray-associated source of alkylamines, ATOFMS analyses of ambient aerosols in the sympagic region indicated that the majority (75–89%) of aerosol alkylamines were of secondary origin, that is, incorporated into the aerosol after gaseous air–sea exchange. These findings show that sympagic seawater properties are a source of alkylamines influencing the biogenic aerosol fluxed from the ocean into the boundary layer; these organic nitrogen compounds should be considered when assessing secondary aerosol formation processes in Antarctica.

Item Type:	Publication - Article
Divisions:	Plymouth Marine Laboratory > Science Areas > Marine Biochemistry and Observations
Depositing User:	Kim Hockley
Date made live:	08 May 2019 15:08
Last Modified:	25 Apr 2020 10:00
URI:	https://plymsea.ac.uk/id/eprint/8187

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