Photos of fossil foraminifer for oxygen isotope analyses. Credit: NIPR

Japanese researchers found that the sea surface water temperature in the northwestern Pacific fluctuated drastically from approximately 800,000 to 750,000 years ago, based on oxygen isotope analyses for fossil foraminifers from an uplifted marine succession in the Chiba composite section on Honshu Island, Japan. A comparison with the results obtained from deep-sea sediment cores suggests that the marine environmental change near the section, which was once deep-sea sediment, could be associated with the discharges of ice meltwater into the North Atlantic.

The climate change record could reveal future climate changes. Scientists gather information about the past environment from proxies such as deep-sea sediments and Antarctic ice cores. These samples are scarce in number because of the limited sampling…

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