Orbital-Scale Spatiotemporal Dynamics of Ocean Deoxygenation During Paleocene-Eocene Thermal Maximum
The Paleocene-Eocene Thermal Maximum(PETM)is characterized by rapid and massive carbon emissions,ocean deoxygenation,and benthic foraminiferal extinction.It is considered a reference for modern climate change.Due to the lack of an objective high-resolution chronostratigraphic framework,effective approaches for quantifying ocean deoxygenation,and precise global-scale Earth system reconstructions,there is a significant uncertainty regarding the rate,magnitude,and spatial distribution of ocean deoxygenation during the PETM,as well as its underlying mechanisms.Therefore,at the forefront of Earth system science,research on the spatiotemporal evolution of ocean deoxygenation during the PETM requires three closely related investigations:providing an orbital-scale geological timeline for the reconstruction of ocean deoxygenation;determining the high-resolution spatiotemporal evolutionary history of ocean deoxygenation events;uncovering the triggering mechanisms and sensitivity of ocean deoxygenation.The in-depth exploration of this paper will enhance the understanding and predictive capability regarding the rate,sensitivity,and spatiotemporal evolution of ocean deoxygenation in the context of ongoing global warming.
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