Figure S8. The annual average of shallow water (Csw) versus deep water (Cdw) nitrate concentrations from 500 Monte‐Carlo simulation cases. Each open circle represents concentrations from one of the 500 runs. The two gray dashed lines are the thresholds separating flushing (red, b> 0.1) and dilution (blue, b < 0.1) patterns from chemostatic (gray, −0.1<= b <= 0.1) patterns. This figure shows that as long as Csw / Cdw > 1.7, nitrate exhibits flushing patterns (red); when Csw / Cdw< 0.8, nitrate export exhibits dilution patterns (blue).