Peer-Reviewed Journal Details
Mandatory Fields
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;Simo, R
2019
May
Acs Earth And Space Chemistry
Simultaneous Detection of Alkylamines in the Surface Ocean and Atmosphere of the Antarctic Sympagic Environment
Published
Optional Fields
CLOUD CONDENSATION NUCLEI SIZE-SEGREGATED AEROSOL SOUTHERN-OCEAN MIXING STATE CHEMICAL-CHARACTERIZATION CONTAINING PARTICLES MASS-SPECTROMETRY CONCORDIA SITE BOUNDARY-LAYER SULFURIC-ACID
3
854
862
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.
2472-3452
10.1021/acsearthspacechem.9b00028
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