Figure 6. Comparison of particulate organic carbon and biogenic silica fluxes estimated using different approaches during EXPORTS.
Depth profiles of POC (left) and bSi (right) fluxes obtained from the MSC assuming a sinking velocity of 18 m d-1 (black triangles) to 36 m d-1 (filled area), Thorium-234 assessment (pink circles, Buesseler et al., 2020) and drifting sediment traps (orange squares, Estapa et al., 2021). The MSC fluxes are calculated using the background biogeochemical concentrations. Note that we do not consider the 195 m depth to be well represented due to there being only a single POC and bSi observation at that depth.