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Título

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

AutorDall'Osto, Manuel CSIC ORCID CVN ; Airs, Ruth; Beale, Rachel; Cree, C.; Fitzsimons, M.; Beddows, David C. S.; Harrison, Roy M.; O'Dowd, Colin D.; Rinaldi, Matteo; Paglione, Marco; Nenes, Athanasios; Decesari, S.; Simó, Rafel CSIC ORCID
Palabras clavePolar ecology
Polar emissions
Southern Ocean
Secondary Aerosols
ATOFMS
Polar biogeochemistry
Marine aerosol
Fecha de publicaciónabr-2019
EditorAmerican Chemical Society
CitaciónACS Earth and Space Chemistry 3: 854-862 (2019)
ResumenMeasurements 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
Descripción9 pages, supporting information https://dx.doi.org/10.1021/acsearthspacechem.9b00028
Versión del editorhttps://dx.doi.org/10.1021/acsearthspacechem.9b00028
URIhttp://hdl.handle.net/10261/184851
DOI10.1021/acsearthspacechem.9b00028
Identificadoresdoi: 10.1021/acsearthspacechem.9b00028
e-issn: 2472-3452
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