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Aerosol particles are dynamic. In some environments, their average lifespan is on the order of hours. In others, they may survive for months, or years. Particles originating in combustion environments can persist in the atmosphere for decades, such as the smoke produced by large fires. On the long tail of aerosol lifetimes, the residence times of any given particle at any one point in space are generally long. This suggests that the chemical inventory of the aerosol has the potential to be a chemically structured mixture of species, even if the bulk aerosol is itself quite a simple mixture of species.
The chemical state of an atmospheric aerosol reflects its local environment. Because aerosol chemical composition varies with time and with location, the chemical state of a specific atmospheric aerosol can change over time, and depending on one's vantage point. Particle processes play a role in determining what aerosol chemistry a particle can access (e.g. size, weathering, etc). The question of what chemical state, therefore, is readily addressed by comparing the spectrum of an aerosol (i.e., specifically what materials are present are they neat-matched or are they refractory) with a spectrum of known composition. For example, the existence of an aerosol's "pure" HCl composition would indicate that chlorofluorocarbons (CFCs) are exceedingly rare in the Earth's atmosphere, a conclusion that was difficult to reach when aerosol composition was conventionally measured. Thus, a measurement of the chemical state of an atmospheric aerosol can provide (or potentially falsify) information about aerosol chemistry. The role of aerosol chemistry in informing our understanding of meteorology is well established (e.g., Hibbs 1983, Land et al. 2006, Reisenbichler et al. 2006, Vallazza et al. 2006)
To understand the nature and origins of BrC, we must examine the physical properties of the aerosol particles that form these compounds. The evolution of a cloud as it moves through the atmosphere must be considered as a time-dependent chemical reaction, in which aerosols are driven from the cloud base and drawn into it, consumed in the process, and then liberated from the cloud base in a subsequent precipitation event. d2c66b5586