Modeling of vertical microplastic transport by rising bubbles

Abstract Microplastic particle concentration at the sea surface is critical for quantifying microplastic transport across water-air interface. Previous studies suggest that enhanced compared to bulk concentration, yet little known about detailed mechanisms behind this enhancement. In work, we model one particular process in simulation may contribute concentration: bubble scavenging. Using lattice-Boltzmann Volume-of-Fluid simulations, find rising bubbles indeed generate a net flow of particles toward surface. The efficiency process, however, highly depends on properties. Clean, hydrophobic adhere much better and are therefore transported significantly than weathered, hydrophilic only entrained around bubble.