Relevant concentrations of dimethyl- and diethylammonium salts(DMA+andDEA+)weremeasured in submicrometer marine aerosol collected over the North Atlantic during periods of high biological activity (HBA) in clean air masses (median concentration (minimum-maximum))26 (6-56) ngm-3). Much lower concentrations were measured during periods of low biological activity (LBA): 1 (<0.4-20) ng m-3 and when polluted air masses were advected to the sampling site: 2 (<0.2-24) ngm-3.DMA+ andDEA+ are the most abundant organic species, second only to MSA, detected in fine marine particles representing on average 11% of the secondary organic aerosol (SOA)fractionandadominantpart(35%onaverage) of the watersoluble organic nitrogen (WSON). Several observations support the hypothesis that DMA+ and DEA+ have a biogenic oceanic source and are produced through the reaction of gaseous amines with sulfuric acid or acidic sulfates. Moreover, the water-soluble fraction of nascent marine aerosol particles produced by bubble-bursting experiments carried out in parallel to ambient aerosol sampling over the open ocean showed WSON, DMA+, and DEA+ concentrations always below the detection limit, thus excluding an important primary sea spray source.
Important Source of Marine Secondary Organic Aerosol from Biogenic Amines / M. C. Facchini; S. Decesari; M. Rinaldi; C. Carbone; E. Finessi; M. Mircea; S. Fuzzi; F. Moretti; E. Tagliavini; D. Ceburnis and C. D. O’Dowd. - In: ENVIRONMENTAL SCIENCE & TECHNOLOGY. - ISSN 0013-936X. - STAMPA. - 42:(2008), pp. 9116-9121. [10.1021/es8018385]
Important Source of Marine Secondary Organic Aerosol from Biogenic Amines
FINESSI, EMANUELA;MORETTI, FABIO;TAGLIAVINI, EMILIO;
2008
Abstract
Relevant concentrations of dimethyl- and diethylammonium salts(DMA+andDEA+)weremeasured in submicrometer marine aerosol collected over the North Atlantic during periods of high biological activity (HBA) in clean air masses (median concentration (minimum-maximum))26 (6-56) ngm-3). Much lower concentrations were measured during periods of low biological activity (LBA): 1 (<0.4-20) ng m-3 and when polluted air masses were advected to the sampling site: 2 (<0.2-24) ngm-3.DMA+ andDEA+ are the most abundant organic species, second only to MSA, detected in fine marine particles representing on average 11% of the secondary organic aerosol (SOA)fractionandadominantpart(35%onaverage) of the watersoluble organic nitrogen (WSON). Several observations support the hypothesis that DMA+ and DEA+ have a biogenic oceanic source and are produced through the reaction of gaseous amines with sulfuric acid or acidic sulfates. Moreover, the water-soluble fraction of nascent marine aerosol particles produced by bubble-bursting experiments carried out in parallel to ambient aerosol sampling over the open ocean showed WSON, DMA+, and DEA+ concentrations always below the detection limit, thus excluding an important primary sea spray source.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
