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Persistent warmth across the Benguela upwelling system during the Pliocene epoch

Lookup NU author(s): Dr Antoni Rosell-Mele, Dr Erin McClymont


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A feature of Pliocene climate is the occurrence of "permanent El Nino-like" or "El Padre" conditions in the Pacific Ocean. From the analysis of sediment cores in the modern northern Benguela upwelling, we show that the mean oceanographic state off Southwest Africa during the warm Pliocene epoch was also analogous to that of a persistent Benguela "El Nino". At present these events occur when massive southward flows of warm and nutrient-poor waters extend along the coasts of Angola and Namibia, with dramatic effects on regional marine ecosystems and rainfall. We propose that the persistent warmth across the Pliocene in the Benguela upwelling ended synchronously with the narrowing of the Indonesian seaway, and the early intensification of the Northern Hemisphere Glaciations around 3.0-3.5 Ma. The emergence of obliquity-related cycles in the Benguela sea surface temperatures (SST) after 3 Ma highlights the development of strengthened links to high latitude orbital forcing. The subsequent evolution of the Benguela upwelling system was characterized by the progressive intensification of the meridional SST gradients, and the emergence of the 100 ky cycle, until the modern mean conditions were set at the end of the Mid Pleistocene transition, around 0.6 Ma. These findings support the notion that the interplay of changes in the depth of the global thermocline, atmospheric circulation and tectonics preconditioned the climate system for the end of the warm Pliocene epoch and the subsequent intensification of the ice ages. (C) 2013 Elsevier B.V. All rights reserved.

Publication metadata

Author(s): Rosell-Mele A, Martinez-Garcia A, McClymont EL

Publication type: Article

Publication status: Published

Journal: Earth and Planetary Science Letters

Year: 2014

Volume: 386

Pages: 10-20

Print publication date: 18/11/2013

ISSN (print): 0012-821X

ISSN (electronic): 1385-013X

Publisher: Elsevier BV


DOI: 10.1016/j.epsl.2013.10.041


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Funder referenceFunder name
U.S. National Science Foundation (NSF)
235626Marie Curie-IOF fellowship
CGL2008-03288-ESpanish MICINN