Supplementary material of IODP Site 342-U1410 and COSMOS model ...

North Atlantic Deep Water (NADW) currently redistributes heat and salt between Earth's ocean basins, and plays a vital role in the ocean-atmosphere CO2 exchange. Despite its crucial role in today's climate system, vigorous debate remains as to when deep-water formation in the North Atlanti...

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Bibliographic Details
Main Authors: Vahlenkamp, Maximilian, Niezgodzki, Igor, De Vleeschouwer, David, Bickert, Torsten, Harper, Dustin T, Kirtland Turner, Sandra, Lohmann, Gerrit, Sexton, Philip F, Zachos, James C, Pälike, Heiko
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA 2018
Subjects:
Center for Marine Environmental Sciences MARUM
Integrated Ocean Drilling Program / International Ocean Discovery Program IODP
NADW
Newfoundland
North Atlantic Deep Water
North Atlantic
Online Access:https://dx.doi.org/10.1594/pangaea.884699
https://doi.pangaea.de/10.1594/PANGAEA.884699
Description
Summary:North Atlantic Deep Water (NADW) currently redistributes heat and salt between Earth's ocean basins, and plays a vital role in the ocean-atmosphere CO2 exchange. Despite its crucial role in today's climate system, vigorous debate remains as to when deep-water formation in the North Atlantic started. Here, we present datasets from carbonate-rich middle Eocene sediments from the Newfoundland Ridge, revealing a unique archive of paleoceanographic change from the progressively cooling climate of the middle Eocene. Well-defined lithologic alternations between calcareous ooze and clay-rich intervals occur at the ~41-kyr beat of axial obliquity. Hence, we identify obliquity as the driver of middle Eocene (43.5-46 Ma) Northern Component Water (NCW, the predecessor of modern NADW) variability. High-resolution benthic foraminiferal d18O and d13C suggest that obliquity minima correspond to cold, nutrient-depleted, western North Atlantic deep waters. We thus link stronger NCW formation with obliquity minima. In ... : Supplement to: Vahlenkamp, Maximilian; Niezgodzki, Igor; De Vleeschouwer, David; Bickert, Torsten; Harper, Dustin T; Kirtland Turner, Sandra; Lohmann, Gerrit; Sexton, Philip F; Zachos, James C; Pälike, Heiko (2018): Astronomically paced changes in deep-water circulation in the western North Atlantic during the middle Eocene. Earth and Planetary Science Letters, 484, 329-340 ...

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