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

Figure 1

Microplastic numerical abundance superimposed on sea surface temperature and chlorophyll-a.

A) Microplastic numerical abundance and sea surface temperature in Summer 2009 (n = 119); B) Microplastic numerical abundance and chorophyll-a in Summer 2009 (n = 119); C) Microplastic numerical abundance and sea surface temperature in Fall 2010 (n = 28); D) Microplastic numerical abundance and chlorophyll-a in Fall 2010 (n = 28). Symbols indicate the location of each manta tow, and microplastic numerical abundance is given in No. m−2. The locations of submesoscale sampling schemata are indicated by (1) grid sample; and (2) line sample. Temperature maps are monthly composites of MODIS-Aqua and MODIS-Terra data, and chlorophyll-a maps are monthly composites of SeaWiFS Level-2 data. Maps were created from composites of the calendar month in which each cruise took place (August 2009 and October 2010). White pixels denote no data due to cloud cover.

Figure 1

doi: https://doi.org/10.1371/journal.pone.0080020.g001