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

Max, L., Lembke-Jene, Lester, Riethdorf, Jan-Rainer, Tiedemann, Ralf, Nürnberg, Dirk, Kühn, H. and Mackensen, A. (2014) Pulses of enhanced North Pacific Intermediate Water ventilation from the Okhotsk Sea and Bering Sea during the last deglaciation Climate of the Past, 10 . pp. 591-605. DOI 10.5194/cp-10-591-2014.

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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 kyr) 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 mid-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.

Document Type: Article
Keywords: North Pacific Intermediate Water; Deglaciation; Atlantic Meridional Overturning Circulation; Foraminiferal stable isotopes; North Atlantic and North Pacific seesaw; Heinrich Stadial
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
DOI etc.: 10.5194/cp-10-591-2014
ISSN: 1814-9324
Related URLs:
Projects: KOMEX, KOMEX II, KALMAR, INOPEX, Future Ocean
Date Deposited: 21 Nov 2013 14:24
Last Modified: 13 Jan 2016 12:27
URI: http://eprints.uni-kiel.de/id/eprint/22482

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