fig1

Figure 1. Effects of bioturbation on tracer profiles in sediment (modified from^[4]). Modeled tracer concentration profile that would result after 60 years of sedimentation at 0.25 cm yr^-1, with the same initial tracer concentration in both panels: (A) with no bioturbation, and (B) with slow bioturbation (3 cm² yr^-1) within a 7 cm surface mixed layer. Note that the bottom of the tracer pulse reaches 14.5 cm in panel a and 24.5 cm in (B). If a sedimentation rate were calculated based on a known date of entry of the tracer in this mixed sediment, without accounting for mixing, the calculated rate would be 1.7 times too high.