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

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doi: 10.1038/nature02639
Author(s): Thomas, Deborah J.
Author Affiliation(s): Primary:
Texas A&M University, Department of Oceanography, College Station, TX, United States
Volume Title: Nature (London)
Source: Nature (London), 430(6995), p.65-68. Publisher: Macmillan Journals, London, United Kingdom. ISSN: 0028-0836 CODEN: NATUAS
Note: In English. 28 refs.; illus., incl. 1 table, sketch maps
Summary: 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 transport. However, understanding the relationship between deep-ocean circulation and ancient climate is complicated by differences in oceanic gateways, 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. (mod. journ. abstr.)
Year of Publication: 2004
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Cenozoic; Chordata; Climate change; Cores; Currents; Deep-water environment; Isotopes; Leg 198; Lower Cenozoic; Metals; Nd-144/Nd-143; Neodymium; North Pacific; Northwest Pacific; ODP Site 1209; ODP Site 1211; Ocean Drilling Program; Ocean currents; Pacific Ocean; Paleo-oceanography; Paleocirculation; Paleoclimatology; Paleocurrents; Paleoecology; Paleotemperature; Pisces; Productivity; Rare earths; Reconstruction; Shatsky Rise; Southern Ocean; Stable isotopes; Vertebrata; West Pacific
Coordinates: N323900 N324000 E1583100 E1583000
N320000 N320000 E1575100 E1575100
Record ID: 2004085802
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