Impact of Riverine Source Rock Buoyancy on Global Ocean POC Flux Simulation

The scatter plot in Figure 3 and the Taylor diagram in Figure 4 indicate that there is no significant difference in the simulation performance of global ocean POC flux between the control group and the sensitive experimental group, despite changes in the concentration of riverine source rock materials and their diffusion distance towards the open ocean. The simulation results of several groups are similar in terms of global ocean POC flux, which suggests that while the consideration of the buoyancy effect of riverine source rock materials did not significantly improve the simulation performance of global ocean POC flux, it also did not have adverse effects. This does not necessarily mean that the simulation performance of the marginal seas in the sensitive experimental group has not changed, but it is possible that the limited sediment trap data collected from the marginal seas have a smaller impact on the overall correlation and regression slope. It is worth noting that although the change in simulation performance is small, the addition of the buoyancy effect of riverine source rock materials has slightly enhanced the correlation coefficient between the simulation results of POC flux and the observed values, from 0.58 in the control group to a maximum of 0.68 in the sensitive experimental group, especially in the sensitive experiment where riverine source rock materials migrate towards the ocean along the continental shelf and slope, without logarithmic transformation.