[MIS08-P04] Study on productivity feedback during the recovery phases of early Eocene hyperthermals: Comparison between the central North Pacific Ocean and southern Indian Ocean
Keywords:PETM, hyperthermals, climate change, deep-sea sediment, biological productivity, Earth system
A previous study using the ODP legacy cores drilled in the southern Indian Ocean indicated that an enhanced biological pump efficiently sequestered the excess carbon in the recovery phases of the PETM and other modest hyperthermals, regardless of the magnitude of the events . However, it remains uncertain whether this productivity feedback is a globally general response of the Earth system to a rapid warming.
Here we newly analyzed deep-sea sediment samples collected from ODP Site 1215A in the central North Pacific Ocean, in which multiple hyperthermal events including the PETM, Eocene Thermal Maximum (ETM) 2 and ETM3 are recorded . We constructed a multi-elemental dataset of major- and trace-element contents, δ13C, δ18O, and CaCO3 content for bulk sediment. Based on the dataset, we estimated the abundance of Ba associated with the biological productivity. In the presentation, we will compare the results in the central North Pacific Ocean and southern Indian Ocean, and discuss their relationships with the multiple hyperthermal events.
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