Baltic Sea plastic levels puzzle researchers

A general view of the archipelago next to Stockholm in the Baltic Sea, Sweden, May 7, 2017. (Ints Kalnins/Reuters)
A Danish-German study has found that the amount of microplastic components has not increased in the Baltic Sea over the last thirty years, despite the production of plastics tripling over the same period, reports Swedish Radio P4 Gotland.

Even the researchers were surprised by the result.

“I assumed there would be an increase because we know that plastic is very long-lasting in nature. But actually what we could see here was that the plastic concentration has actually been constant, it is not accumulating,” professor Torkel Gissel Nielsen from the Technical University of Denmark tells Radio Sweden.

Gaps in knowledge
Plastic waste can be a source of microplastic in the sea. (Johan Hellström/Sveriges Radio)

He cites several possible explanations for this, it could be that the plastic particles have settled at the bottom of the sea, or that the water streams have brought the particles out into the North Sea instead – or that the plastic has been degraded by bacteria.

“There are a lot of potential gaps in our knowledge about how plastic is recycled in the environment that we need to consider in future studies,” says Torkel Gissel Nielsen.

The study is based on analysis of fish and plankton samples collected in southern Baltic Sea over the past 30 years. This is the longest period that has been covered by a study into microplastics in the Baltics.

Related stories from around the North:

Canada: Scientists search Arctic waters for microplastics, Radio Canada International

Finland: Plastic recycling slow to gain ground in Finland, YLE News

Norway: Microplastics found in waters off Svalbard, Alaska Dispatch News

Sweden: Sweden considers higher fees for plastic bags, Radio Sweden

United States: Tackling Alaska’s $100-million plastic pollution problem, Alaska Dispatch News


Radio Sweden

For more news from Sweden visit Radio Sweden.

Do you want to report an error or a typo? Click here!

Leave a Reply

Note: By submitting your comments, you acknowledge that Radio Canada International has the right to reproduce, broadcast and publicize those comments or any part thereof in any manner whatsoever. Radio Canada International does not endorse any of the views posted. Your comments will be pre-moderated and published if they meet netiquette guidelines.
Netiquette »

Your email address will not be published. Required fields are marked *