CCN closure study: Effects of aerosol chemical composition and mixing state
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...%) to the observed NR PM1 loading (143± 40 µg/m3) in line with other studies at this location (Bhattu & Tripathi, 2015; Chakraborty et al., 2015; Kaul, Gupta, Tripathi, Tare, & Collett, 2011; Tare et al., 2006)....
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...For ambient data set, a CE amb (collection efficiency) value of 0.5 is used in this study, similar to what has been reported in other AMS studies at the same location (Bhattu & Tripathi, 2015; Chakraborty et al., 2015; Shamjad et al., 2015)....
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...NR PM1 mass concentration is well within the range of previously reported PM1 values (100–530 µg/m3) at this location (Bhattu & Tripathi, 2015; Gupta & Mandariya, 2013; Kaul, Gupta, & Tripathi, 2012, 2011; Tare et al., 2006)....
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...In this study we focus on CCN activity, and indeed, many CCN closure studies show that the quality of the closure depends crucially on the assumptions about aerosol mixing state (McFiggans et al., 2006; Wang et al., 2010; Bhattu and Tripathi, 2015; Ervens et al., 2010)....
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References
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"CCN closure study: Effects of aeros..." refers background in this paper
...Atmospheric aerosols indirectly affect the global energy budget by acting as cloud condensation nuclei (CCN) [Charlson et al., 1992]....
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3,324 citations
"CCN closure study: Effects of aeros..." refers background in this paper
...…of aerosols (10–70% of the submicron mass of the ambient aerosols), their formation mechanisms, detailed speciation, and roles in influencing the Earth’s radiation budget are still not well understood [Saxena and Hildemann, 1996; Turpin et al., 2000; Hallquist et al., 2009; Kanakidou et al., 2005]....
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3,104 citations
"CCN closure study: Effects of aeros..." refers background or methods in this paper
...…better closure results obtained are unexpected because atmospheric processes, such as coagulation, gas condensation, and photochemical transformation, will shift these aerosols to an internally mixed state [Moore et al., 2011; De Gouw and Jimenez, 2009; Jimenez et al., 2009; Shamjad et al., 2012]....
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...The rapidly evolving and transforming nature of organics in polluted urban and semiurban regions around the globe demand temporally resolved and size-resolved chemical composition measurements to account for the role of organic aerosols in CCN activity [Jimenez et al., 2009; Ng et al., 2011]....
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...The O:C ratio is the best representation of the degree of oxygenation [Jimenez et al., 2009; Aiken et al., 2008]....
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...Even after considerable efforts, the dependence of aerosol hygroscopicity on the degree of oxygenation under subsaturated and supersaturated conditions is not well understood [Jimenez et al., 2009; Chang et al., 2010; Juranyi et al., 2009]....
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