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The great Pacific garbage patch was described in a 1988 paper published by the National Oceanic and Atmospheric Administration (NOAA) of the United States. The description was based on results obtained by several Alaska-based researchers in 1988 that measured neustonic plastic in the North Pacific Ocean.
Because it is a dynamic system, a gyreâs exact size is difficult to measure, but the North Pacific Subtropical Gyre is estimated to be 7 to 9 million square miles. This is equivalent to approximately three times the area of the continental United States (three million square miles). Marine debris items can become entrained within the North Pacific Subtropical Gyre and accumulate in the center, based on its overall convergence. Gyres can accumulate debris on a very large scale, but they do not produce âgarbage patchâ-like concentrations. Another area known to concentrate marine debris is the North Pacific Subtropical Convergence Zone (STCZ). This convergence feature concentrates food sources for many species, making it a high productivity area for feeding and breeding.