Phasing of millennial-scale climate variability in the Pacific and Atlantic Oceans

Maureen H. Walczak; Alan C. Mix; Ellen A. Cowan; Stewart Fallon; L. Keith Fifield; Jay R. Alder; Jianghui Du; Brian Haley; Tim Hobern; June Padman; Summer K. Praetorius; Andreas Schmittner; Joseph S. Stoner; Sarah D. Zellers

doi:10.1126/science.aba7096

Phasing of millennial-scale climate variability in the Pacific and Atlantic Oceans

Maureen H. Walczak^*, Alan C. Mix, Ellen A. Cowan, Stewart Fallon, L. Keith Fifield, Jay R. Alder, Jianghui Du, Brian Haley, Tim Hobern, June Padman, Summer K. Praetorius, Andreas Schmittner, Joseph S. Stoner, Sarah D. Zellers

^*Corresponding author for this work

Climate and Ocean Geoscience

Research output: Contribution to journal › Article › peer-review

55 Citations (Scopus)

Abstract

New radiocarbon and sedimentological results from the Gulf of Alaska document recurrent millennial-scale episodes of reorganized Pacific Ocean ventilation synchronous with rapid Cordilleran Ice Sheet discharge, indicating close coupling of ice-ocean dynamics spanning the past 42,000 years. Ventilation of the intermediate-depth North Pacific tracks strength of the Asian monsoon, supporting a role for moisture and heat transport from low latitudes in North Pacific paleoclimate. Changes in carbon-14 age of intermediate waters are in phase with peaks in Cordilleran ice-rafted debris delivery, and both consistently precede ice discharge events from the Laurentide Ice Sheet, known as Heinrich events. This timing precludes an Atlantic trigger for Cordilleran Ice Sheet retreat and instead implicates the Pacific as an early part of a cascade of dynamic climate events with global impact.

Original language	English
Pages (from-to)	716-720
Number of pages	5
Journal	Science
Volume	370
Issue number	6517
DOIs	https://doi.org/10.1126/science.aba7096
Publication status	Published - 6 Nov 2020

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title = "Phasing of millennial-scale climate variability in the Pacific and Atlantic Oceans",

abstract = "New radiocarbon and sedimentological results from the Gulf of Alaska document recurrent millennial-scale episodes of reorganized Pacific Ocean ventilation synchronous with rapid Cordilleran Ice Sheet discharge, indicating close coupling of ice-ocean dynamics spanning the past 42,000 years. Ventilation of the intermediate-depth North Pacific tracks strength of the Asian monsoon, supporting a role for moisture and heat transport from low latitudes in North Pacific paleoclimate. Changes in carbon-14 age of intermediate waters are in phase with peaks in Cordilleran ice-rafted debris delivery, and both consistently precede ice discharge events from the Laurentide Ice Sheet, known as Heinrich events. This timing precludes an Atlantic trigger for Cordilleran Ice Sheet retreat and instead implicates the Pacific as an early part of a cascade of dynamic climate events with global impact.",

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AU - Walczak, Maureen H.

AU - Mix, Alan C.

AU - Cowan, Ellen A.

AU - Fallon, Stewart

AU - Keith Fifield, L.

AU - Alder, Jay R.

AU - Du, Jianghui

AU - Haley, Brian

AU - Hobern, Tim

AU - Padman, June

AU - Praetorius, Summer K.

AU - Schmittner, Andreas

AU - Stoner, Joseph S.

AU - Zellers, Sarah D.

PY - 2020/11/6

Y1 - 2020/11/6

N2 - New radiocarbon and sedimentological results from the Gulf of Alaska document recurrent millennial-scale episodes of reorganized Pacific Ocean ventilation synchronous with rapid Cordilleran Ice Sheet discharge, indicating close coupling of ice-ocean dynamics spanning the past 42,000 years. Ventilation of the intermediate-depth North Pacific tracks strength of the Asian monsoon, supporting a role for moisture and heat transport from low latitudes in North Pacific paleoclimate. Changes in carbon-14 age of intermediate waters are in phase with peaks in Cordilleran ice-rafted debris delivery, and both consistently precede ice discharge events from the Laurentide Ice Sheet, known as Heinrich events. This timing precludes an Atlantic trigger for Cordilleran Ice Sheet retreat and instead implicates the Pacific as an early part of a cascade of dynamic climate events with global impact.

AB - New radiocarbon and sedimentological results from the Gulf of Alaska document recurrent millennial-scale episodes of reorganized Pacific Ocean ventilation synchronous with rapid Cordilleran Ice Sheet discharge, indicating close coupling of ice-ocean dynamics spanning the past 42,000 years. Ventilation of the intermediate-depth North Pacific tracks strength of the Asian monsoon, supporting a role for moisture and heat transport from low latitudes in North Pacific paleoclimate. Changes in carbon-14 age of intermediate waters are in phase with peaks in Cordilleran ice-rafted debris delivery, and both consistently precede ice discharge events from the Laurentide Ice Sheet, known as Heinrich events. This timing precludes an Atlantic trigger for Cordilleran Ice Sheet retreat and instead implicates the Pacific as an early part of a cascade of dynamic climate events with global impact.

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VL - 370

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EP - 720

JO - Science

JF - Science

IS - 6517

ER -

Phasing of millennial-scale climate variability in the Pacific and Atlantic Oceans

Abstract

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