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{Zhang:2022:10.1029/2021pa004329,
author = {Zhang, Y and Boer, AM and Lunt, DJ and Hutchinson, DK and Ross, P and Flierdt, T and Sexton, P and Coxall, HK and Steinig, S and Ladant, J and Zhu, J and Donnadieu, Y and Zhang, Z and Chan, W and AbeOuchi, A and Niezgodzki, I and Lohmann, G and Knorr, G and Poulsen, CJ and Huber, M},
doi = {10.1029/2021pa004329},
journal = {Paleoceanography and Paleoclimatology},
pages = {1--22},
title = {Early Eocene ocean meridional overturning circulation: the roles of atmospheric forcing and strait geometry},
url = {http://dx.doi.org/10.1029/2021pa004329},
volume = {37},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Here, we compare the ocean overturning circulation of the early Eocene (47-56 Ma) in eight coupled climate model simulations from the Deep-Time Model Intercomparison Project (DeepMIP), and investigate the causes of the observed inter-model spread. The most common global meridional overturning circulation (MOC) feature of these simulations is the anticlockwise bottom cell, fed by sinking in the Southern Ocean. In the North Pacific, one model (GFDL) displays strong deepwater formation and one model (CESM) shows weak deepwater formation, while in the Atlantic two models show signs of weak intermediate water formation (MIROC and NorESM). The location of the Southern Ocean deepwater formation sites varies among models and relates to small differences in model geometry of the Southern Ocean gateways. Globally, convection occurs in the basins with smallest local freshwater gain from the atmosphere. The global MOC is insensitive to atmospheric CO2 concentrations from 1x (i.e. 280 ppm) to 3x (840ppm) pre-industrial levels. Only two models have simulations with higher CO2 (i.e. CESM and GFDL) and these show divergent responses, with a collapsed and active MOC, respectively, possibly due to differences in spin-up conditions. Combining the multiple model results with available proxy data on abyssal ocean circulation highlights that strong Southern Hemisphere-driven overturning is the most likely feature of the early Eocene. In the North Atlantic, unlike the present day, neither model results nor proxy data suggest deepwater formation in the open ocean during the early Eocene, while the evidence for deepwater formation in the North Pacific remains inconclusive.
AU  - Zhang,Y
AU  - Boer,AM
AU  - Lunt,DJ
AU  - Hutchinson,DK
AU  - Ross,P
AU  - Flierdt,T
AU  - Sexton,P
AU  - Coxall,HK
AU  - Steinig,S
AU  - Ladant,J
AU  - Zhu,J
AU  - Donnadieu,Y
AU  - Zhang,Z
AU  - Chan,W
AU  - AbeOuchi,A
AU  - Niezgodzki,I
AU  - Lohmann,G
AU  - Knorr,G
AU  - Poulsen,CJ
AU  - Huber,M
DO  - 10.1029/2021pa004329
EP  - 22
PY  - 2022///
SN  - 2572-4517
SP  - 1
TI  - Early Eocene ocean meridional overturning circulation: the roles of atmospheric forcing and strait geometry
T2  - Paleoceanography and Paleoclimatology
UR  - http://dx.doi.org/10.1029/2021pa004329
UR  - https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2021PA004329
UR  - http://hdl.handle.net/10044/1/95076
VL  - 37
ER  -
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