Influence of NaCl concentration on the optical scattering properties of water-based aerosols

Pattyn, Christian A.; Zenker, Jake P.; Redman, Brian J.; van der Laan, John D.; Sanchez, Andres L.; Westlake, Karl; Patel, Lekha; Bentz, Brian Z.; Wright, Jeremy B.

doi:10.1364/AO.492544

Influence of NaCl concentration on the optical scattering properties of water-based aerosols

Journal Article · Mon Jul 10 00:00:00 EDT 2023 · Applied Optics

DOI:https://doi.org/10.1364/AO.492544· OSTI ID:1991986

Pattyn, Christian A.; Zenker, Jake P.; Redman, Brian J.; ; Sanchez, Andres L.; Westlake, Karl; Patel, Lekha; ;

We present the characterization of several atmospheric aerosol analogs in a tabletop chamber and an analysis of how the concentration of NaCl present in these aerosols influences their bulk optical properties. Atmospheric aerosols (e.g., fog and haze) degrade optical signal via light–aerosol interactions causing scattering and absorption, which can be described by Mie theory. This attenuation is a function of the size distribution and number concentration of droplets in the light path. These properties are influenced by ambient conditions and the droplet’s composition, as described by Köhler theory. It is therefore possible to tune the wavelength-dependent bulk optical properties of an aerosol by controlling droplet composition. We present experimentation wherein we generated multiple microphysically and optically distinct atmospheric aerosol analogs using salt water solutions with varying concentrations of NaCl. The results demonstrate that changing the NaCl concentration has a clear and predictable impact on the microphysical and optical properties of the aerosol.

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Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003525

OSTI ID:: 1991986

Alternate ID(s):: OSTI ID: 2311536
OSTI ID: 1988675

Report Number(s):: SAND--2023-06414J

Journal Information:: Applied Optics, Journal Name: Applied Optics Journal Issue: 20 Vol. 62; ISSN 1559-128X; ISSN APOPAI

Publisher:: Optical Society of AmericaCopyright Statement

Country of Publication:: United States

Language:: English

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