Imperial College London
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ProfessorTinavan de Flierdt

Faculty of Engineering, Department of Earth Science & Engineering

Head of the Department of Earth Science and Engineering
 
 
 
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Contact

 

+44 (0)20 7594 1290tina.vandeflierdt

 
 
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Location

 

G.30Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Struve:2020:10.1073/pnas.1908138117,
author = {Struve, T and Wilson, DJ and van, de Flierdt T and Pratt, N and Crocket, KC},
doi = {10.1073/pnas.1908138117},
journal = {Proceedings of the National Academy of Sciences},
pages = {889--894},
title = {Middle Holocene expansion of Pacific Deep Water into the Southern Ocean},
url = {http://dx.doi.org/10.1073/pnas.1908138117},
volume = {117},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The Southern Ocean is a key region for the overturning and mixing of water masses within the global ocean circulation system. Because Southern Ocean dynamics are influenced by the Southern Hemisphere westerly winds (SWW), changes in the westerly wind forcing could significantly affect the circulation and mixing of water masses in this important location. While changes in SWW forcing during the Holocene (i.e., the last ∼11,700 y) have been documented, evidence of the oceanic response to these changes is equivocal. Here we use the neodymium (Nd) isotopic composition of absolute-dated cold-water coral skeletons to show that there have been distinct changes in the chemistry of the Southern Ocean water column during the Holocene. Our results reveal a pronounced Middle Holocene excursion (peaking ∼7,000–6,000 y before present), at the depth level presently occupied by Upper Circumpolar Deep Water (UCDW), toward Nd isotope values more typical of Pacific waters. We suggest that poleward-reduced SWW forcing during the Middle Holocene led to both reduced Southern Ocean deep mixing and enhanced influx of Pacific Deep Water into UCDW, inducing a water mass structure that was significantly different from today. Poleward SWW intensification during the Late Holocene could then have reinforced deep mixing along and across density surfaces, thus enhancing the release of accumulated CO2 to the atmosphere.
AU  - Struve,T
AU  - Wilson,DJ
AU  - van,de Flierdt T
AU  - Pratt,N
AU  - Crocket,KC
DO  - 10.1073/pnas.1908138117
EP  - 894
PY  - 2020///
SN  - 0027-8424
SP  - 889
TI  - Middle Holocene expansion of Pacific Deep Water into the Southern Ocean
T2  - Proceedings of the National Academy of Sciences
UR  - http://dx.doi.org/10.1073/pnas.1908138117
UR  - https://www.pnas.org/content/117/2/889
UR  - http://hdl.handle.net/10044/1/76625
VL  - 117
ER  -
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