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Publications [#278674] of Paul A. Baker

Papers Accepted

  1. Dwyer, GS; Cronin, TM; Baker, PA; Raymo, ME; Buzas, JS; Corrège, T, North atlantic deepwater temperature change during late pliocene and late quaternary climatic cycles, Science (New York, N.Y.), vol. 270 no. 5240 (January, 1995), pp. 1347-1351, American Association for the Advancement of Science (AAAS) [repository], [doi]
    (last updated on 2019/09/15)

    Abstract:
    Variations in the ratio of magnesium to calcium (Mg/Ca) in fossil ostracodes from Deep Sea Drilling Project Site 607 in the deep North Atlantic show that the change in bottom water temperature during late Pliocene 41,000-year obliquity cycles averaged 1.5°C between 3.2 and 2.8 million years ago (Ma) and increased to 2.3°C between 2.8 and 2.3 Ma, coincidentally with the intensification of Northern Hemisphere glaciation. During the last two 100,000-year glacial-to-interglacial climatic cycles of the Quaternary, bottom water temperatures changed by 4.5°C. These results show that glacial deepwater cooling has intensified since 3.2 Ma, most likely as the result of progressively diminished deep-water production in the North Atlantic and of the greater influence of Antarctic bottom water in the North Atlantic during glacial periods. The ostracode Mg/Ca data also allow the direct determination of the temperature component of the benthic foraminiferal oxygen isotope record from Site 607, as well as derivation of a hypothetical sea-level curve for the late Pliocene and late Quaternary. The effects of dissolution on the Mg/Ca ratios of ostracode shells appear to have been minimal.


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