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Publication abstract: Studies over the last two decades have shown that submicron particulates (SMPs) can be transferred from the seawater into sea spray aerosol (SSA), potentially impacting SSA cloud seeding ability. This work reports the first concurrent bulk and sea surface microlayer (SSML) SMP (0.4 1.0 µm) measurements, made during two mesocosm phytoplankton blooms in a region removed from active wave breaking and bubble formation, providing insight into how biological and physicochemical processes influence seawater SMP distributions. Modal analyses of the SMP size distributions revealed contributions from multiple, biologically-related particulate populations that were controlled by the microbial loop. With negligible bubble scavenging occurring, SSML enrichment of SMPs remained low throughout both experiments, suggesting this process is vital for SMP enrichment in the SSML. Because many biological SMPs can induce ice formation in SSA, our findings are discussed in the context of SMP transfer into SSA and its potential importance for SSA ice nucleation. Research Data Curation Program, UC San Diego, La Jolla, 92093-0175 (https://lib.ucsd.edu/rdcp) Crocker, Daniel R.; Deane, Grant B.; Cao, Ruochen; Santander, Mitchell V.; Morris, Clare K.; Mitts, Brock A.; Dinasquet, Julie; Amiri, Sarah; Malfatti, Francesca; Prather, Kimberly A.; Thiemens, Mark H. (2021). Data from: Biologically Induced Changes in the Partitioning of Submicron Particulates Between Bulk Seawater and the Sea Surface Microlayer. In Center for Aerosol Impacts on Chemistry of the Environment (CAICE). UC San Diego Library Digital Collections. https://doi.org/10.6075/J0SQ90JD