On the competition among aerosol number, size and composition in predicting CCN variability: a multi-annual field study in an urbanized desert

Atmospheric Chemistry and Physics
E CrosbieArmin Sorooshian

Abstract

A 2-year data set of measured CCN (cloud condensation nuclei) concentrations at 0.2 % supersaturation is combined with aerosol size distribution and aerosol composition data to probe the effects of aerosol number concentrations, size distribution and composition on CCN patterns. Data were collected over a period of 2 years (2012-2014) in central Tucson, Arizona: a significant urban area surrounded by a sparsely populated desert. Average CCN concentrations are typically lowest in spring (233 cm(-3)), highest in winter (430 cm(-3)) and have a secondary peak during the North American monsoon season (July to September; 372 cm(-3)). There is significant variability outside of seasonal patterns, with extreme concentrations (1 and 99 % levels) ranging from 56 to 1945 cm(-3) as measured during the winter, the season with highest variability. Modeled CCN concentrations based on fixed chemical composition achieve better closure in winter, with size and number alone able to predict 82% of the variance in CCN concentration. Changes in aerosol chemical composition are typically aligned with changes in size and aerosol number, such that hygroscopicity can be parameterized even though it is still variable. In summer, models based on fixed che...Continue Reading

References

Feb 28, 2004·Science·M O AndreaeM A F Silva-Dias
Jul 29, 2005·Environmental Science & Technology·Ho-Jin LimBarbara J Turpin
Mar 3, 2007·Science·Allen L RobinsonSpyros N Pandis
Oct 2, 2009·Nature·Bjorn Stevens, Graham Feingold
Oct 1, 2011·Journal of Geophysical Research. Atmospheres : JGR·Armin SorooshianEric A Betterton

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Citations

Feb 1, 2016·Atmosphere·Aishwarya RamanArmin Sorooshian
Oct 3, 2018·Environmental Science and Pollution Research International·Aristeidis Voliotis, Constantini Samara
Nov 27, 2016·Journal of Geophysical Research. Atmospheres : JGR·Amber OrtegaArmin Sorooshian
Jan 1, 2020·Atmospheric Chemistry and Physics·A E ChristiansenB H Henderson

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