TY  - JOUR
VL  - 50
N1  - This work is licensed under a Creative Commons Attribution 4.0 International License. The images
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JF  - Geophysical Research Letters
PB  - American Geophysical Union (AGU)
A1  - Inglis, Gordon N
A1  - Bhatia, Rehemat
A1  - Evans, David
A1  - Zhu, Jiang
A1  - Müller, Wolfgang
A1  - Mattey, David
A1  - Thornalley, David JR
A1  - Stockey, Richard G
A1  - Wade, Bridget S
KW  - Cenozoic temperature
KW  -  multi-proxy
KW  -  North Atlantic eocene
KW  -  foraminifera
Y1  - 2023/12/23/
TI  - Surface Ocean Cooling in the Eocene North Atlantic Coincides
With Declining Atmospheric CO2
AV  - public
IS  - 24
N2  - The Eocene (56?34 million years ago) is characterized by declining sea surface temperatures (SSTs) in the low latitudes (?4°C) and high southern latitudes (?8?11°C), in accord with decreasing CO2 estimates. However, in the mid?to?high northern latitudes there is no evidence for surface water cooling, suggesting thermal decoupling between northern and southern hemispheres and additional non?CO2 controls. To explore this further, we present a multi?proxy (Mg/Ca, ?18O, TEX86) SST record from Bass River in the western North Atlantic. Our compiled multi?proxy SST record confirms a net decline in SSTs (?4°C) between the early Eocene Climatic Optimum (53.3?49.1 Ma) and mid?Eocene (?44?41 Ma), supporting declining atmospheric CO2 as the primary mechanism of Eocene cooling. However, from the mid?Eocene onwards, east?west North Atlantic temperature gradients exhibit different trends, which we attribute to incursion of warmer waters into the eastern North Atlantic and inception of Northern Component Water across the early?middle Eocene transition.
UR  - http://dx.doi.org/10.1029/2023gl105448
ID  - discovery10184562
ER  -