The Cenozoic palaeo environment of the Arctic Ocean

Article Abstract:

A Cenozoic palaeoceanographic record constructed from >400 m of sediment core from a recent drilling expedition to the Lomonosov ridge in the Arctic Ocean is reported. Evidence is found for the first occurrence of ice-rafted debris in the middle Eocene epoch, the temperatures of surface waters during the Palaeocene/Eocene thermal maximum have appeared to be substantially warmer than previously estimated and the revised timing of the earliest Arctic cooling events coincides with those from Antarctica.

Arctic, Cenozoic Era, Paleoclimatology, Arctic Ocean

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Rapid stepwise onset of Antarctic glaciation and deeper calcite compensation in the Pacific Ocean

Article Abstract:

The ocean sediment records of calcium carbonate content as well as carbon and oxygen isotopic compositions from the tropical Pacific Ocean that covers the Eocene/Oligocene boundary is presented. It is found that the deepening of the calcite compensation depth was more rapid than previously documented and occurred in two jumps of about 40,000 years each, synchronous with the stepwise onset of Antarctic ice-sheet growth.

United States, Calcite, Ocean basins

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No extreme bipolar glaciation during the main Eocene calcite compensation shift

Article Abstract:

The hypothesis that the large ice sheets were present in both hemispheres approximately 41.6 million years ago was tested. Results showed that the threshold for continental glaciation was crossed earlier in Southern Hemisphere than in Northern Hemisphere due to the different land-ICEat the two poles.

Analysis, Ice sheets

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