Litter survey detects the South Atlantic ‘garbage patch’

A distance-based technique was used to assess the distribution and abundance of floating marine debris (>1 cm) in the southeast Atlantic Ocean between Cape Town and Tristan da Cunha, crossing the southern edge of the South Atlantic ‘garbage patch’ predicted by surface drift models. Most litter was made of plastic (97%). Detection distances were influenced by the size and buoyancy of litter items. Litter density decreased from coastal waters off Cape Town (>100 items km(-2)) to oceanic waters (<10 items km(-2)), and was consistently higher (6.2 +/- 1.3 items km(-2)) from 3 to 8 E than in adjacent oceanic waters (2.7 +/- 0.3 items km(-2)) or in the central South Atlantic around Tristan (1.0 +/- 0.4 items km(-2)). The area with high litter density had few seaweeds, suggesting that most litter had been drifting for a long time. The results indicate that floating debris is accumulating in the South Atlantic gyre as far south as 34-35 degrees S.

Ryan, Peter G., Marine Pollution Bulletin, vol. 79 (1-2), Pages 220-224, February 2014

The article

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s