How Big Is the "Great Pacific Garbage Patch"? Science vs. Myth
UPDATED FEBRUARY 7, 2013 -- While everything may be bigger in Texas, some reports about the "Great Pacific Garbage Patch" would lead you to believe that this marine mass of plastic is bigger than Texas—maybe twice as big as the Lone Star State, or even twice as big as the continental U.S. For NOAA, a national science agency, separating science from science fiction about the Pacific garbage patch (and other "garbage patches") is important when answering people's questions about what it is and how we should deal with the problem. (For the record, no scientifically sound estimates exist for the size or mass of these garbage patches.) The NOAA Marine Debris Program's Carey Morishige takes down two myths floating around with the rest of the debris about the garbage patches in a recent post on the Marine Debris Blog:
- There is no "garbage patch," a name which conjures images of a floating landfill in the middle of the ocean, with miles of bobbing plastic bottles and rogue yogurt cups. Morishige explains this misnomer:
While it's true that these areas have a higher concentration of plastic than other parts of the ocean, much of the debris found in these areas are small bits of plastic (microplastics) that are suspended throughout the water column. A comparison I like to use is that the debris is more like flecks of pepper floating throughout a bowl of soup, rather than a skim of fat that accumulates (or sits) on the surface.
She's not downplaying the significance of microplastics. They are nearly ubiquitous today—degrading into tiny bits from a range of larger plastic items [PDF] and now turning up in everything from face scrubs to fleece jackets—and their impacts on marine life mostly remain a big unknown.
- There are many "garbage patches," and by that, we mean that trash congregates to various degrees in numerous parts of the Pacific and the rest of the ocean. These natural gathering points appear where rotating currents, winds, and other ocean features converge to accumulate marine debris, as well as plankton, seaweed, and other sea life. (Find out more about these "convergence zones" in the ocean and a NOAA study of the North Pacific Subtropical Convergence Zone [PDF].)
Any way you look at these "peppery soups" of plastic in the Pacific, none of the debris should be there. The NOAA Marine Debris website and blog have lots of great information and references if you want to learn more about the garbage patch issue.
Looking for more information about the "garbage patches"?
- Where Are the Pacific Garbage Patches Located?
- Is There a Garbage Patch in the Great Lakes?
- Podcast: The Great Pacific Garbage Patch
Editor's Note: This post was updated 02/07/2013 to correct the statement that previously misidentified the North Pacific Subtropical Convergence Zone as the "Great Pacific Garbage Patch." What is known as the Great Pacific Garbage Patch is actually the Eastern Pacific garbage patch, associated with the atmospheric area known as the North Pacific Subtropical High.