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 and 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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