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Scales of Spatial Heterogeneity of Plastic Marine Debris in the Northeast Pacific Ocean

Figure 4

Scale-dependence of variance in microplastic concentration and surface biophysical variables.

A) Microplastic numerical concentration; B) Sea surface temperature; C) Sea surface salinity; D) Sea surface fluorescence. Dots are the values of the empirical semivariogram and the lines are a description of the data trends. A is fitted with a linear model, and B–D with Gaussian models. Data are shown for Summer 2009 only since sample size in Fall 2010 was insufficient for this analysis.

Figure 4