Antarctic bottom water (AABW) covers more than two-thirds of the global ocean bottom, and its formation has recently decreased. However, its long-term variability has not been well understood. Researchers led by Prof. Chenglong Deng from the Institute of Geology and Geophysics (IGG) of the Chines
Nodules on the seafloor at the study site, photographed by an underwater camera. Credit: YAO Huiqiang
Magnetic scanning was an important factor in providing precise dating results. “This is a key, though the final dating was obtained by an integration withBe, flux of metal Co, and astronomical tuning,” said Dr. Liang Yi from Tongji University, first author of the study and a postdoc at IGG/CAS. These results show that seawater oxygen has experienced a linear increase in the Eastern Pacific since around 3.4 mya. This trend agrees with the observation of the Antarctic Ice Sheet , suggesting a covariation between them.
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