Global mass of buoyant marine plastics dominated by large long-lived debris

Plastic litter in oceans overestimated but could persist longer than expected, study suggests NatureGeosci

Second, we include two scenarios for biofouling using a recently developed Lagrangian model. Biochemistry fields from the Mercator Ocean BIOMER4 analysis product are used at 1/4° resolution. Biofilm on plastic particles is gained via collisions and growth with algae in this model and is lost via respiration. Biofilm loss via grazing and viral lysis is neglected to keep the amount of free model parameters limited since this effect is suggested to be minor.

In the next two sections, we discuss how sources, transport and sinks of marine plastics are parameterized in the transition matrix model. We touch on plausible ranges for each parameter value as these are used to define the prior probability density functions in the Bayesian analysis when assimilating observational data into the model .

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