The Great Pacific Garbage Patch is a collection of marine debris in the North Pacific Ocean. Marine debris is litter that ends up in oceans, seas, and other large bodies of water.The Great Pacific Garbage Patch lies in an area between the U.S. states of Hawaii and California. This area is in the middle of the North Pacific Subtropical Gyre.
An ocean gyre is a circular ocean current formed by the Earth’s wind patterns and the forces created by the rotation of the planet. The area in the center of a gyre tends to be very calm and stable. The circular motion of the gyre draws in debris. Debris eventually makes its way into the center of the gyre, where it becomes trapped and builds up. A similar garbage patch exists in the Atlantic Ocean, in the North Atlantic Gyre.
The motion of the gyre prevents garbage and other materials from escaping. The amount of material in the Great Pacific Garbage Patch accumulates because much of it is not biodegradable. Many plastics, for instance, do not wear down; they simply break into tinier and tinier pieces.
For many people, the idea of a “garbage patch” conjures up images of an island of trash floating on the ocean. In reality, these patches are usually made up of tiny bits of plastic, called microplastics. Microplastics that make up the majority of garbage patches can’t always be seen by the naked eye. Satellite imagery of oceans doesn’t show a giant patch of garbage.
The existence of the Great Pacific Garbage Patch was predicted by many oceanographers and climatologists. However, the actual discovery of the patch was made by a racing boat captain, Charles Moore. Moore was sailing from Hawaii to California after competing in a yachting race. Crossing the North Pacific Subtropical Gyre, Moore and his crew noticed millions of pieces of plastic surrounding his ship.
Plastic products can be very harmful to marine life in the gyre. For instance, loggerhead sea turtles often mistake plastic bags for jellyfish, their favorite food.
And many marine mammals and birds,such as albatrosses, have become strangled by the plastic rings used to hold six-packs of soda together.
Marine debris can also disturb marine food webs in the North Pacific Subtropical Gyre. As microplastics and other trash collect on the surface of the ocean, they block sunlight from reaching plankton and algae below. Algae and plankton are the most common autotrophs in the marine food web. Autotrophs are organisms that can produce their own nutrients from oxygen, carbon, and sunlight.
If algae and plankton communities are threatened, the entire food web may change. Animals such as fish and turtles that feed on algae and plankton will have less food. If those animals start to die, there will be less food for predator species such as tuna, sharks, and whales.
The Great Pacific Garbage Patch collects marine debris from North America and Asia, as well as ships traveling through the area. Trash from the coast of North America takes about six years to reach the Great Pacific Garbage Patch, while trash from Japan and other Asian countries takes about a year.
No one knows how much debris makes up the entire patch. The North Pacific Subtropical Gyre is about 19 million square kilometers (7 million square miles). It is too large for scientists to trawl the entire surface. In addition, not all of the trash floats on the surface. Denser debris can sink to the middle or bottom of the water. We have no way to measure this unseen litter.
Taken from National Geographic Education
