Particulate organic carbon (POC) concentration and POC vertical flux data were collected at site P3 in the South Atlantic during an austral spring bloom in 2017. Data were collected on the COMICS cruise (DY086) aboard the RRS Discovery. POC concentration and POC flux are averaged across each of the three site visits. POC concentration and fluxes are derived from three gliders (Wet Labs Eco Puck sensors on two Teledyne Webb Research Slocum G2 gliders (Unit-398 & Unit-404) and one Kongsberg Seaglider (SG-542)) that were deployed during the cruise and calibrated by ship-based deployments (CTD bottle collection, marine snow catchers and neutrally buoyant sediment traps). Fast, Slow and Total Fluxes were calculated by separating large spikes (Fast Flux) in the backscatter signal from small spikes (Slow Flux) and background noise, with total being a summation of Fast and Slow Fluxes.

The glider mission was supported by a European Research Council Consolidator grant (GOCART, agreement number 724416) to S. A. Henson, as well as South Africa's Department of Science and Innovation (DST/CON0182/2017) and the National Research Foundation (SANAP: SNA170522231782) grants to S. J. Thomalla.