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Regional Report on Sea-based Marine Litter in the ... - nowpap dinrac

Regional Report on Sea-based Marine Litter in the ... - nowpap dinrac

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<str<strong>on</strong>g>Regi<strong>on</strong>al</str<strong>on</strong>g> <str<strong>on</strong>g>Report</str<strong>on</strong>g> <strong>on</strong> <strong>Sea</strong>-<strong>based</strong> <strong>Mar<strong>in</strong>e</strong> <strong>Litter</strong> <strong>in</strong> <strong>the</strong> NOWPAP Regi<strong>on</strong>Figure 7 shows <strong>the</strong> distriuti<strong>on</strong> of float<strong>in</strong>g plastics observed <strong>in</strong> 2007 (a) w<strong>in</strong>ter, (b)spr<strong>in</strong>g, (c) summer and (d) autumn. The size of black circles corresp<strong>on</strong>ds to <strong>the</strong>number of float<strong>in</strong>g plastics per 100 km. “+” simbols denote that no plastics werefound dur<strong>in</strong>g <strong>the</strong> daytime.In some parts of <strong>the</strong> sea adjacent to Japan, more than 50 pieces/100 km were foundfrom w<strong>in</strong>ter to summer of 2007. In additi<strong>on</strong>, 10-20 pieces/100 km were also foundaround <strong>the</strong> Kuroshio and <strong>the</strong> Kuroshio Extensi<strong>on</strong>.Figure 8. Time series of <strong>the</strong> number of float<strong>in</strong>g plasticsFigure 9. Data areaFigure 8 shows <strong>the</strong> time series of <strong>the</strong> float<strong>in</strong>g plastics (<strong>in</strong> pieces/100 km) found <strong>in</strong> <strong>the</strong>sea adjacent to Japan (blue l<strong>in</strong>e) (area (A) <strong>in</strong> Figure 9), <strong>in</strong> 20-30 °N al<strong>on</strong>g 137 °E(green l<strong>in</strong>e) and <strong>in</strong> 0-20 °N al<strong>on</strong>g 137 °E (red l<strong>in</strong>e) (l<strong>in</strong>e (B) figure 9). The number offloat<strong>in</strong>g plastics <strong>in</strong> <strong>the</strong> seas adjacent to Japan had a peak dur<strong>in</strong>g 1988–1990. S<strong>in</strong>ce<strong>the</strong>n, <strong>the</strong> number decreased until 2000, after which it gradually <strong>in</strong>creased aga<strong>in</strong>.12

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