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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, J
An 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 Letters

Volume

49

Issue

9

Article number

e2022GL098051

Number

e2022GL098051

Pagination

1-11

ISSN

0094-8276

Department/School

School of Natural Sciences

Publisher

Amer Geophysical Union

Place of publication

2000 Florida Ave Nw, Washington, USA, Dc, 20009

Rights statement

Copyright 2022. American Geophysical Union.

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the earth sciences

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