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High surface microplastic abundance at 30°S, 90°W supports eastward extension of the South Pacific garbage patch

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Ryota Nakajima, Kazutaka Takahashi, Ryota Nakajima, Ryota Nakajima, Ryota Nakajima, Ryota Nakajima, Ryota Nakajima, Hidetaka Nomaki, Hidetaka Nomaki, Hidetaka Nomaki, Ryota Nakajima, Hidetaka Nomaki, Satoshi Osafune, Satoshi Osafune, Satoshi Osafune, Shiye Zhao, Shiye Zhao Hidetaka Nomaki, Takuya Ohnishi, Hidetaka Nomaki, Hidetaka Nomaki, Hidetaka Nomaki, Takuya Ohnishi, Hayao Yokochi, Shiye Zhao Hayao Yokochi, Kazutaka Takahashi, Shiye Zhao, Ryota Nakajima, Ryota Nakajima, Maki Noguchi Aita, Maki Noguchi Aita, Ryota Nakajima, Kazutaka Takahashi, Kazutaka Takahashi, Hidetaka Nomaki, Minoru Ikehara, Atsushi Tsuda, Atsushi Tsuda, Kazutaka Takahashi, Satoshi Osafune, Hidetaka Nomaki, Ryota Nakajima, Shiye Zhao

Summary

A latitudinal ocean survey found extremely high concentrations of microplastics and mesoplastics at 30°S, 90°W in the eastern South Pacific — one to two orders of magnitude higher than at other sampled latitudes — providing direct field evidence that the South Pacific Garbage Patch extends much further east than previously mapped. Particle-tracking models corroborated the finding. This matters because the South Pacific is vast and largely unmonitored, and better mapping of accumulation zones is essential for understanding plastic pollution hotspots and their impacts on marine life.

Study Type Environmental

Abstract We conducted a latitudinal survey of floating plastic particles in the eastern South Pacific Ocean, spanning 10°S to 55°S. Samples were collected using neuston nets along 90°-100°W, providing rare data for this understudied region, including the South Pacific Subtropical Gyre (SPSG). The highest abundances were recorded at 30°S, 90°W (microplastics: 139,811 pieces km⁻² or 192,579 pieces km⁻² after correction for wind speed and wave height; mesoplastics: 30,229 pieces km⁻²), representing values one to two orders of magnitude greater than at other latitudinal sites and likely located within the convergence zone of the SPSG. The pronounced latitudinal contrasts in plastic particles detected at 30°S, 90°W as well as particle-tracking simulations based on ocean reanalysis data, corroborated earlier modeling predictions that the South Pacific Garbage Patch extends eastward to at least 90°W.

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