Ocean oil slicks can be attributed to natural seepages or to anthropogenic discharges. To date, the global picture of their distribution and relative natural and anthropogenic contributions remains unclear. Here, by analyzing 563,705 Sentinel-1 images from 2014–2019, we provide the first global map of oil slicks and a detailed inventory of static-and-persistent sources (natural seeps, platforms, and pipelines). About 90% of oil slicks were within 160 kilometers of shorelines, with 21 high-density slick belts coinciding well with shipping routes. Quantified by slick area, the proportion of anthropogenic discharges was an order of magnitude greater than natural seepages (94 versus 6%), in contrast to the previous estimate quantified by volume during 1990–1999 (54 versus 46%). Our findings reveal that the present-day anthropogenic contribution to marine oil pollution may have been substantially underestimated.

中文翻译：

---

全球海洋中的慢性油污

海洋浮油可归因于自然渗漏或人为排放。迄今为止，它们的分布以及相对的自然和人为贡献的全球情况仍不清楚。在这里，通过分析 2014 年至 2019 年的 563,705 张 Sentinel-1 图像，我们提供了首张全球浮油地图以及静态和持久来源（自然渗漏、平台和管道）的详细清单。约90%的浮油位于海岸线160公里以内，21条高密度浮油带与航道吻合良好。按光滑面积量化，人为排放的比例比自然渗漏高一个数量级（94 对 6%），与之前在 1990-1999 年按体积量化的估计（54 对 46%）形成对比。