Figure 2.33 shows the total amount of plastic contained
in NPSG compared to the total amount of plastic contained
in the model asymptotically reached ~21.4%. This
is why the total efficiency shown in Figure 2.36 seems to
have an upper limit. This can be seen in the fact that the
Arrays of 450 and 500 km length catch the same amount
of particles over time. This implies that these Arrays can
extract close to 100% of a gyres’ plastic and thus their
efficiency is limited by the amount of plastic contained
in the gyre.