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SeaFlow is an underway flow cytometer that provides continuous shipboard observations of the abundance and optical properties of small phytoplankton (, Measurement(s)planktonic material • temperature of water • salinity • light irradiance • plankton size distributionTechnology Type(s)flow cytometer • Temperature Sensor Device • salinometer • photometerFactor Type(s)time • locationSample Characteristic - OrganismCyanobacteria • Micromonas pusilla • Navicula transitans • Thalassiosira pseudonana • Thalassiosira weissflogii • Geminifera cryophila • Crocosphaera • Synechococcus sp. WH 8012 • Synechococcus sp. WH 6501 • Prochlorococcus eMED4 • Prochlorococcus eMIT9312 • Prochlorococcus AS9601 • Prochlorococcus 1314Sample Characteristic - Environmentoceanic sea surface microlayer biome • sea waterSample Characteristic - LocationNorth Pacific Ocean Machine-accessible metadata file describing the reported data: 10.6084/m9.figshare.10110755

Ocean greening off Hawai'i From June to August 2018, the eruption of Kīlauea volcano triggered a diatom-dominated phytoplankton bloom. Wilson et al. set sail to sample the plume, deploying subsea gliders and using satellite monitoring to measure the dynamics of this rare event in the nutrient-poor Pacific (see the Perspective by Ducklow and Plank). They found subsurface chlorophyll maxima not visible by remote sensing, performed transcriptome and N isotope marker analysis, and measured nutrients, partitioning of biomass into different organisms, and primary production. Much of the data are corroborated by physical modeling of the ocean dynamics. The authors conclude that the plume was fed by the lava heating subsurface water and triggering upwelling of deepwater nutrients to the surface rather than by direct injection of micronutrients from lava. Science , this issue p. 1040 ; see also p. 978