Enhanced North Pacific deep-ocean stratification by stronger intermediate water formation during Heinrich Stadial 1

The deglacial history of CO2 release from the deep North Pacific remains unresolved. This is due to conflicting indications about subarctic Pacific ventilation changes based on various marine proxies, especially for Heinrich Stadial 1 (HS-1) when a rapid atmospheric CO2 rise occurs. Here, we use a c...

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Bibliographic Details
Published in:Nature Communications
Main Authors: Gong, X., Lembke-Jene, L., Lohmann, G., Knorr, G., Tiedemann, Ralf, Zou, J. J., Shi, X. F.
Format: Article in Journal/Newspaper
Language:English
Published: Nature Research 2019
Subjects:
Pacific
Subarctic
Online Access:https://oceanrep.geomar.de/id/eprint/44205/
https://oceanrep.geomar.de/id/eprint/44205/1/s41467-019-08606-2.pdf
https://doi.org/10.1038/s41467-019-08606-2
Description
Summary:The deglacial history of CO2 release from the deep North Pacific remains unresolved. This is due to conflicting indications about subarctic Pacific ventilation changes based on various marine proxies, especially for Heinrich Stadial 1 (HS-1) when a rapid atmospheric CO2 rise occurs. Here, we use a complex Earth System Model to investigate the deglacial North Pacific overturning and its control on ocean stratification. Our results show an enhanced intermediate-to-deep ocean stratification coeval with intensified North Pacific Intermediate Water (NPIW) formation during HS-1, compared to the Last Glacial Maximum. The stronger NPIW formation causes lower salinities and higher temperatures at intermediate depths. By lowering NPIW densities, this enlarges vertical density gradient and thus enhances intermediate-to-deep ocean stratification during HS-1. Physically, this process prevents the North Pacific deep waters from a better communication with the upper oceans, thus prolongs the existing isolation of glacial Pacific abyssal carbons during HS-1.

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