Yearly Trend of marine litter in the Northwest Pacific Region
As shown in upper figure, the number and weight of marine litter increase
rapidly from 2005. One reason is the number of surveyed beaches was increased
in 2005 with starting of monitoring survey in the Pacific side (shown in
right figure (upper)).
The number of marine litter double to previous years and the weight increased
threefold compared with the increase (one and half) of surveyed sites.
Right figure (lower) shows the number and weight per 100m2. From this figure, it is clear that the number per 100m2 is decreasing against the weight per 100m2 is increasing. In 2006, the weight per 100m2 increased dramatically.
In addition, specially in Japan, the weight per one marine litter is
increasing (shown in bottom table).
Because of this, it is necessary to pay more attention to the composition
of marine litter and its change.
|
2003 |
2004 |
2005 |
2006 |
2007 |
| China |
17.0 |
11.3 |
18.1 |
13.8 |
11.8 |
| Japan |
4.1 |
7.4 |
7.6 |
9.5 |
12.1 |
| Korea |
6.6 |
2.0 |
4.9 |
1.4 |
3.9 |
| Russia |
23.6 |
11.0 |
23.2 |
20.5 |
8.3(g) |
The weight per one marine litter
The number of surveyed beaches
2.jpg)