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- W2007179341 abstract "Dichotomous (PM 2.5–10 and PM 2.5 modes) and size‐resolved marine aerosols collected during the northeastern monsoon on two wintertime cruises in the subtropical South China Sea (SCS) were analyzed for water‐soluble ions. During the sampling periods the study region was under the influence of strong pollution originating primarily from the Asian continent. Elevated levels of non‐sea‐salt sulfate and ammonium ions of up to 4.5 and 1.2 μ g/m 3 , respectively, were observed, indicating that the SCS is now substantially contaminated by massive amounts of air pollutants most likely from China and South/Southeast Asia. The non‐sea‐salt sulfate to nitrate mass ratios reaching 3.8 ± 1.9 are much larger than those (approximately 2) in and around East Asia and the western Pacific Ocean, suggesting that the Asian outflow aerosols measured in the SCS experienced different traveling history from those in the vicinity of source regions. High chloride depletion (Cl‐depletion) measured in the SCS marine aerosols was, on average, 30% for coarse‐mode particles and nearly 90% for fine‐mode particles. Cl‐depletion is size‐dependent, and maximizes in submicrometer particles (i.e., Cl has almost been completely lost). Acid displacement is responsible for the observed high Cl‐depletion: nitrate substitution accounts for the coarse‐mode depletion, whereas sulfate substitution accounts for the fine‐mode depletion. The acid displacement of sea salt aerosols may be related to a variety of factors, especially the substantial air pollution, which is discussed in detail in this paper. On cloudy/rainy days, fine‐mode aerosol samples have moderate Cl‐depletion (i.e., ∼40–50%), in contrast to nearly complete Cl loss on sunny days, presumably indicating that photochemical reactions would play a key role in the Cl‐deficit; however, it merits further investigation as the available samples were limited." @default.
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- W2007179341 date "2007-10-09" @default.
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- W2007179341 title "Water-soluble species in the marine aerosol from the northern South China Sea: High chloride depletion related to air pollution" @default.
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- W2007179341 doi "https://doi.org/10.1029/2007jd008844" @default.
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