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Progressive Progressive intensification of Pacific Deep Water circulation since the early Pliocene
journal contribution
posted on 2023-05-21, 13:10 authored by Yin, S, Hernandez-Molina, FJ, Martin JutzelerMartin Jutzeler, Li, JAn important stage in global ocean overturning circulation is the upwelling of the Antarctic Bottom Water into the Pacific Deep Water (PDW). The long-term evolution of PDW circulation, however, is scarcely addressed. We use seismic reflection data and cores from the International Ocean Discovery Program (and its predecessors) in contourites to reconstruct regional deep ocean circulation patterns. Here, we demonstrate that PDW circulation was progressively enhanced at about 4.35, 3.84, 2.16, and 0.97 Ma since the early Pliocene. Coeval growth of volcanic arcs and tectonic uplifts gradually isolated marginal seas from the PDW and, in conjunction with climate cooling, effectively increasing deep-water flux within a shrinking Pacific basin. Regional stratigraphic discontinuities in contourites indicate thresholds in the intensification of ocean circulation.
History
Publication title
Geophysical Research LettersVolume
49Issue
9Article number
e2022GL098051Number
e2022GL098051Pagination
1-11ISSN
0094-8276Department/School
School of Natural SciencesPublisher
Amer Geophysical UnionPlace of publication
2000 Florida Ave Nw, Washington, USA, Dc, 20009Rights statement
Copyright 2022. American Geophysical Union.Repository Status
- Restricted