Upwelling Intensification As Part of the Pliocene-Pleistocene Climate Transition

作者：J.R. Marlow, Carina B. Lange, Gerold Wefer, Antoni Rosell‐Melé · 发表于：Science · 年份：2000 · DOI：10.1126/science.290.5500.2288 · 被引用次数：385 · 研究领域：Geology and Paleoclimatology Research、Geological formations and processes、Marine and environmental studies

A deep-sea sediment core underlying the Benguela upwelling system off southwest Africa provides a continuous time series of sea surface temperature (SST) for the past 4.5 million years. Our results indicate that temperatures in the region have declined by about 10 degrees C since 3.2 million years ago. Records of paleoproductivity suggest that this cooling was associated with an increase in wind-driven upwelling tied to a shift from relatively stable global warmth during the mid-Pliocene to the high-amplitude glacial-interglacial cycles of the late Quaternary. These observations imply that Atlantic Ocean surface water circulation was radically different during the mid-Pliocene.