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Evidence for deep-water production in the North Pacific Ocean during the early Cenozoic warm interval

Nature volume 430, pages 65–68 (2004)Cite this article

Abstract

The deep-ocean circulation is responsible for a significant component of global heat transport. In the present mode of circulation, deep waters form in the North Atlantic and Southern oceans where surface water becomes sufficiently cold and dense to sink. Polar temperatures during the warmest climatic interval of the Cenozoic era (∼ 65 to 40 million years (Myr) ago) were significantly warmer than today, and this may have been a consequence of enhanced oceanic heat transport1. However, understanding the relationship between deep-ocean circulation and ancient climate is complicated by differences in oceanic gateways2, which affect where deep waters form and how they circulate. Here I report records of neodymium isotopes from two cores in the Pacific Ocean that indicate a shift in deep-water production from the Southern Ocean to the North Pacific ∼65 Myr ago. The source of deep waters reverted back to the Southern Ocean 40 Myr ago. The relative timing of changes in the neodymium and oxygen isotope records indicates that changes in Cenozoic deep-water circulation patterns were the consequence, not the cause, of extreme Cenozoic warmth.

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Figure 1: Palaeogeographic reconstructions during two intervals of the early Cenozoic.
Figure 2: Neodymium isotope records from ODP Sites 1209 and 1211.

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Acknowledgements

The author thanks T. Bralower, U. Rohl and N. Slowey for discussions, the science party, staff and crew of ODP Leg 198, and the Ocean Drilling Program for supplying sample material. This work was supported by JOI.

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  1. Department of Oceanography, Texas A&M University, College Station, Texas, 77843-3146, USA

    Deborah J. Thomas

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Correspondence to Deborah J. Thomas.

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Thomas, D. Evidence for deep-water production in the North Pacific Ocean during the early Cenozoic warm interval. Nature 430, 65–68 (2004). https://doi.org/10.1038/nature02639

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