δ30Si diatom and diatom fossil assemblage data from IODP Site 323-U1343 between 0.6 and 1.2 Ma ...

High latitude ocean-atmosphere CO2 dynamics are considered important in glacial-interglacial climate, with deep-ocean carbon burial via the biological pump being highly variable through the Quaternary. During the Mid-Pleistocene Transition (MPT) shift to 100 kyr glacials, it has been suggested that...

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Bibliographic Details
Main Authors: Worne, Savannah, Swann, George E A, Kender, Sev, Lacey, Jack H, Leng, Melanie J
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA 2021
Subjects:
Bering Sea
Diatom
Mid Pleistocene Transition
MPT
Sea ice
Silicon isotopes
δ30Si
Pacific
Southern Ocean
Subarctic
Online Access:https://dx.doi.org/10.1594/pangaea.933139
https://doi.pangaea.de/10.1594/PANGAEA.933139
Description
Summary:High latitude ocean-atmosphere CO2 dynamics are considered important in glacial-interglacial climate, with deep-ocean carbon burial via the biological pump being highly variable through the Quaternary. During the Mid-Pleistocene Transition (MPT) shift to 100 kyr glacials, it has been suggested that elevated atmospheric-driven iron fertilisation and increased efficiency of the biological pump in the Southern Ocean was key in lowering atmospheric pCO2 and facilitating rapid land ice accumulation. Growing evidence suggests carbon cycling in the subarctic Pacific Ocean played a key role in late Quaternary glacials, although this has not yet been assessed during the MPT. Here, the silicon isotope composition of diatoms (δ30Sidiatom) from the high productivity upwelling region in the Bering Sea is used to assess the role of the subarctic Pacific biological pump in the MPT. Results show the “900 kyr event” was characterised by low silicic acid but high nitrate utilisation, coincident with the dominance of diatom ...

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