Fig. 2

Subsurface Ocean microplastics (MP = LMP + SMP) observations. A MP number concentrations per m³ of sea water. B MP mass concentrations for datasets where particle/fiber size distribution was reported (see Methods). The shaded vertical bar indicates the range of mean ± 1σ mass concentrations estimated for the Pacific and Atlantic Oceans (45 to 175 μg m⁻³, Table 1)