Pulses of enhanced North Pacific Intermediate Water ventilation from the Okhotsk Sea and Bering Sea during the last deglaciation

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doi: 10.5194/cp-10-591-2014
Author(s): Max, L.; Lembke-Jene, L.; Riethdorf, J. R.; Tiedemann, R.; Nürnberg, D.; Kühn, H.; Mackensen, A.
Author Affiliation(s): Primary:
Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany
Helmholtz-Zentrum für Ozeanforschung Kiel, Germany
Volume Title: Climate of the Past
Source: Climate of the Past, 10(2), p.591-605. Publisher: Copernicus, Katlenburg-Lindau, International. ISSN: 1814-9324
Note: In English. 65 refs.; illus., incl. 2 tables, sketch map
Summary: Under modern conditions only North Pacific Intermediate Water is formed in the northwest Pacific Ocean. This situation might have changed in the past. Recent studies with general circulation models indicate a switch to deep-water formation in the northwest Pacific during Heinrich Stadial 1 (17.5-15.0 ka) of the last glacial termination. Reconstructions of past ventilation changes based on paleoceanographic proxy records are still insufficient to test whether a deglacial mode of deep-water formation in the North Pacific Ocean existed. Here we present deglacial ventilation records based on radiocarbon-derived ventilation ages in combination with epibenthic stable carbon isotopes from the northwest Pacific including the Okhotsk Sea and Bering Sea, the two potential source regions for past North Pacific ventilation changes. Evidence for most rigorous ventilation of the intermediate-depth North Pacific occurred during Heinrich Stadial 1 and the Younger Dryas, simultaneous to significant reductions in Atlantic Meridional Overturning Circulation. Concurrent changes in δ13C and ventilation ages point to the Okhotsk Sea as driver of millennial-scale changes in North Pacific Intermediate Water ventilation during the last deglaciation. Our records additionally indicate that changes in the δ13C intermediate-water (700-1750 m water depth) signature and radiocarbon-derived ventilation ages are in antiphase to those of the deep North Pacific Ocean (>2100 m water depth) during the last glacial termination. Thus, intermediate- and deep-water masses of the northwest Pacific have a differing ventilation history during the last deglaciation.
Year of Publication: 2014
Research Program: ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Absolute age; Atlantic meridional overturning circulation; Bering Sea; C-13/C-12; C-14; Carbon; Cenozoic; Dates; Deglaciation; Detroit Seamount; Dissolved oxygen; Emperor Seamounts; Foraminifera; Heinrich events; Holocene; Ice; Invertebrata; Isotope ratios; Isotopes; Leg 145; Microfossils; North Pacific; North Pacific Intermediate Water; Northwest Pacific; O-18/O-16; ODP Site 883; Ocean Drilling Program; Ocean circulation; Okhotsk Sea; Oxygen; Pacific Ocean; Paleo-oceanography; Protista; Quaternary; Radioactive isotopes; Sea ice; Sea water; Solutes; Spectra; Stable isotopes; Stratigraphy; West Pacific; X-ray fluorescence spectra
Coordinates: N511155 N511155 E1674607 E1674607
N524200 N560400 E1691400 E1441300
Record ID: 2014060259
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Copernicus Gesellschaft, Katlenburg-Lindau, Germany