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(Table 2) Radiocarbon ages of planktic and benthic foraminifera in sediment core SO201-2-77 from the northwest Pacific

Authors
Publisher
PANGAEA
Publication Date
Identifiers
DOI: 10.1594/pangaea.830219
Keywords
  • Age
  • 14C Ams
  • Age
  • Dated
  • Age
  • Dated Material
  • Age
  • Dated Standard Deviation
  • Awi_Paleo
  • Kalmar Ii
  • Paleoenvironmental Reconstructions From Marine Sediments @ Awi
  • Piston Corer
  • Sample
  • Optional Label/Labor No
  • Shirshov Ridge
  • So201/2
  • So201-2-77
  • Sonne
Disciplines
  • Biology
  • Earth Science
  • Geography

Abstract

Clim. Past, 10, 591–605, 2014 www.clim-past.net/10/591/2014/ doi:10.5194/cp-10-591-2014 © Author(s) 2014. CC Attribution 3.0 License. Climate of the Past O pen A ccess Pulses of enhanced North Pacific Intermediate Water ventilation from the Okhotsk Sea and Bering Sea during the last deglaciation L. Max1, L. Lembke-Jene1, J.-R. Riethdorf2, R. Tiedemann1, D. Nürnberg2, H. Kühn1, and A. Mackensen1 1Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung, Am Handelshafen 12, 27570 Bremerhaven, Germany 2GEOMAR, Helmholtz-Zentrum für Ozeanforschung Kiel, Wischhofstr. 1–3, 24148 Kiel, Germany Correspondence to: L. Max ([email protected]) Received: 11 October 2013 – Published in Clim. Past Discuss.: 7 November 2013 Revised: 13 February 2014 – Accepted: 13 February 2014 – Published: 21 March 2014 Abstract. Under modern conditions only North Pacific Inter- mediate 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. Reconstruc- tions 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 poten- tial 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 P

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