Hygroscopic growth and cloud droplet activation of xanthan gum as a proxy for marine hydrogels: HYGROSCOPICITY OF XG AS MARINE HYDROGEL

Dawson, K. W.; Petters, M. D.; Meskhidze, N.; Petters, S. Suda; Kreidenweis, S. M.

doi:10.1002/2016jd025143

Title: Hygroscopic growth and cloud droplet activation of xanthan gum as a proxy for marine hydrogels: HYGROSCOPICITY OF XG AS MARINE HYDROGEL

Journal Article · Fri Sep 23 00:00:00 EDT 2016 · Journal of Geophysical Research: Atmospheres

DOI:https://doi.org/10.1002/2016jd025143· OSTI ID:1532984

Dawson, K. W. ^[1]; Petters, M. D. ^[1]; Meskhidze, N. ^[1]; Petters, S. Suda ^[1];

^[2]

North Carolina State Univ., Raleigh, NC (United States)
Colorado State Univ., Fort Collins, CO (United States)

Knowledge of the physical characteristics and chemical composition of marine organic aerosols is needed for the quantification of their effects on cloud microphysical processes and solar radiative transfer. Here we use xanthan gum (XG)—a bacterial biopolymer—as a proxy for marine hydrogels. Measurements were performed for pure XG particles and mixtures of XG with sodium chloride, calcium nitrate, and calcium carbonate. The aerosol hygroscopicity parameter (κ) is derived from hygroscopic growth factor measurements (κ_gf) at variable water activity (a_w) and from cloud condensation nuclei activation efficiency (κ_ccn). The Zdanovskii, Stokes, and Robinson (ZSR) hygroscopicity parameter derived for multicomponent systems (κ_mix, sol) is used to compare measurements of κ_gf and κ_ccn. Pure XG shows close agreement of κ_gf (at aw = 0.9) and κccn of 0.09 and 0.10, respectively. Adding salts to the system results in deviations of κ_gf (at a_w = 0.9) from κ_ccn. The measured κ_gf and ZSR-derived hygroscopicity parameter (κ_mix, sol) values for different solutions show close agreement at aw > 0.9, while κ_gf is lower in comparison to κ_mix, sol at a_w < 0.9. The differences between predicted κmix, sol and measured κ_gf and κ_ccn values are explained by the effects of hydration and presence of salt ions on the structure of the polymer networks. Results from this study imply that at supersaturations of 0.1 and 0.5%, the presence of 30% sea salt by mass can reduce the activation diameter of pure primary marine organic aerosols from 257 to 156 nm and from 87 to 53 nm, respectively.

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Research Organization:: Univ. of Colorado, Boulder, CO (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0010470

OSTI ID:: 1532984

Journal Information:: Journal of Geophysical Research: Atmospheres, Vol. 121, Issue 19; ISSN 2169-897X

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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