IMIS

Using a small boat, foam and microlayer were collected using a glass plate sampler, and 1-m deep water using a syringe connected to a hose. In addition, rainwater for flow cytometry was collected close to the coast in Duran bottles. Samples were fixed with glutardialdehyde (1% final concentration, Merck, Sweden), stored for 1 hour in the dark and subsequently stored at -80 °C. The purpose of the cellular and viral abundance assessment was to complement metagenomic analyses to investigate viral dispersal across the air-sea interface and along the natural water cycle. In addition, metadata for light conditions, wind speed, salinity, and temperature were recorded. For further details on the campaign and flow cytometric analysis, please refer to Rahlff et al., 2022.