The role of jet and film drops in controlling the mixing state of submicron sea spray aerosol particles

• Published in: Proceedings of the National Academy of Sciences - PNAS Vol. 114; no. 27; pp. 6978 - 6983
• Main Authors: Wang, Xiaofei, Deane, Grant B., Moore, Kathryn A., Ryder, Olivia S., Stokes, M. Dale, Beall, Charlotte M., Collins, Douglas B., Santander, Mitchell V., Burrows, Susannah M., Sultana, Camille M., Prather, Kimberly A.
• Format: Journal Article
• Language: English
• Published: United States National Academy of Sciences 03-07-2017; National Academy of Sciences, Washington, DC (United States)
• Subjects: Aerosols; Atmospheric aerosols; Biological activity; Bursting; Chemical composition; Climate; climate modeling; Clouds; Composition effects; Crystals; Environmental Molecular Sciences Laboratory; ENVIRONMENTAL SCIENCES; global aerosol-climate models; Global Modeling; Hydrophobicity; Ice; Ice crystals; Ice formation; Impact prediction; marine aerosol; Marine biology; Oceans; Particulates; Physical Sciences; Predictive control; Salts; sea spray aerosol; Seawater; Species; jet drop; film drop; sea spray aerosol; bubble bursting; mixing state
• ISSN: 0027-8424; 1091-6490
• DOI: 10.1073/pnas.1702420114

The oceans represent a significant global source of atmospheric aerosols. Sea spray aerosol (SSA) particles comprise sea salts and organic species in varying proportions. In addition to size, the overall composition of SSA particles determines how effectively they can form cloud droplets and ice crystals. Thus, understanding the factors controlling SSA composition is critical to predicting aerosol impacts on clouds and climate. It is often assumed that submicrometer SSAs are mainly formed by film drops produced from bursting bubble-cap films, which become enriched with hydrophobic organic species contained within the sea surface microlayer. In contrast, jet drops formed from the base of bursting bubbles are postulated to mainly produce larger supermicrometer particles from bulk seawater, which comprises largely salts and water-soluble organic species. However, here we demonstrate that jet drops produce up to 43% of total submicrometer SSA number concentrations, and that the fraction of SSA produced by jet drops can be modulated by marine biological activity. We show that the chemical composition, organic volume fraction, and ice nucleating ability of submicrometer particles from jet drops differ from those formed from film drops. Thus, the chemical composition of a substantial fraction of submicrometer particles will not be controlled by the composition of the sea surface microlayer, a major assumption in previous studies. This finding has significant ramifications for understanding the factors controlling the mixing state of submicrometer SSA particles and must be taken into consideration when predicting SSA impacts on clouds and climate.