According to a three-year study published in Scientific Reports on March 23, 2018, the mass known as the Great Pacific Garbage Patch is about 1.6 million square kilometers in size — up to 16 times bigger than previous estimates. That makes it more than double the size of Texas. Ghost nets, or discarded fishing nets, make up almost half the 80,000 metric tons of garbage floating at sea, and researchers believe that around 20% of the total volume of trash is debris from the 2011 Japanese tsunami.
The study — conducted by an international team of scientists with The Ocean Cleanup Foundation, six universities and an aerial sensor company — utilized two aircraft surveys and 30 vessels to cross the debris field.
Along with nets to survey and collect trash, researchers used two six-meter-wide devices to measure medium to large-sized objects. An aircraft was also fitted with advanced sensors to collect 3D scans of the ocean garbage. They ended up collecting a total of 1.2 million plastic samples and scanned more than 300 square kilometers of ocean surface. The bulk of the pile is made up of larger objects while only 8% of the mass is microplastics, or pieces smaller than 5 millimeters in size.
The patch is so big that last fall environmentalists called on the United Nations to declare the Great Pacific Garbage Patch a country, called “The Trash Isles,” complete with its own passport and currency, called debris...Research scientist Britta Denise Hardesty, who wasn’t involved in this study, said while discarded nets may make up almost half of the findings, the problem may be more nuanced. It’s estimated 640,000 tons of fishing gear is lost to the marine environment each year.
Excerpts from A massive garbage patch in the middle of the Pacific Ocean is now three times the size of France, CNN, Mar. 24, 2017