Single-Particle Characterization of Summertime Antarctic Aerosols Collected at King George Island Using Quantitative Energy-Dispersive Electron Probe X-ray Microanalysis and Attenuated Total Reflection Fourier Transform-Infrared Imaging Techniques
- Authors
- Maskey, Shila; Geng, Hong; Song, Young-Chul; Hwang, HeeJin; Yoon, Young-Jun; Ahn, Kang-Ho; Ro, Chul-Un
- Issue Date
- Aug-2011
- Publisher
- AMER CHEMICAL SOC
- Keywords
- PHYTOPLANKTON BLOOM; INDIVIDUAL PARTICLES; IRON FERTILIZATION; SOUTHERN-OCEAN; REGIONS; COASTAL; CHEMICAL SPECIATION; KOREA; SEA-SALT PARTICLES; METHANESULFONATE
- Citation
- ENVIRONMENTAL SCIENCE & TECHNOLOGY, v.45, no.15, pp.6275 - 6282
- Indexed
- SCIE
SCOPUS
- Journal Title
- ENVIRONMENTAL SCIENCE & TECHNOLOGY
- Volume
- 45
- Number
- 15
- Start Page
- 6275
- End Page
- 6282
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/37253
- DOI
- 10.1021/es200936m
- ISSN
- 0013-936X
- Abstract
- Single-particle characterization of Antarctic aerosols was performed to investigate the impact of marine biogenic sulfur species on the chemical compositions of sea-salt aerosols in the polar atmosphere. Quantitative energy-dispersive electron probe X-ray microanalysis was used to characterize 2900 individual particles in 10 sets of aerosol samples collected between March 12 and 16, 2009 at King Sejong Station, a Korean scientific research station located at King George Island in the Antarctic. Two size modes of particles, i.e., PM(2.5-10) and PM(1.0-2.5), were analyzed, and four types of particles were identified, with sulfur-containing sea-salt particles being the most abundant, followed by genuine,sea-salt particles without sulfur species, iron-containing particles, and other species including CaCO(3)/CaMg(CO(3))(2), organic carbon, and alumino-silicates. When a sulfur-containing sea-salt particle showed an atomic concentration ratio of sulfur to sodium of >0.083 (seawater ratio), it is regarded as containing nonsea-salt sulfate (nss-SO(4)(2-)) and/or methanesulfonate (CH(3)SO(3)(-)), which was supported by attenuated total reflection Fourier transform-infrared imaging measurements. These internal mixture particles of sea-salt/CH(3)SO(3)(-)/SO(4)(2-) were very frequently encountered. As nitrate-containing particles were not encountered, and the air-masses for all of the samples originated from the Pacific Ocean (based on 5-day backward trajectories), the oxidation of dimethylsulfide (DMS) emitted from phytoplanktons in the ocean is most likely to be responsible for the formation of the mixed sea-salt/CH(3)SO(3)(-)/SO(4)(2-) particles.
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