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Atlantic-Pacific asymmetry in deep water formation

Atlantic-Pacific asymmetry in deep water formation
Atlantic-Pacific asymmetry in deep water formation
While the Atlantic Ocean is ventilated by high-latitude deep water formation and exhibits a pole-to-pole overturning circulation, the Pacific Ocean does not. This asymmetric global overturning pattern has persisted for the past 2–3 million years, with evidence for different ventilation modes in the deeper past. In the current climate, the Atlantic-Pacific asymmetry occurs because the Atlantic is more saline, enabling deep convection. To what extent the salinity contrast between the two basins is dominated by atmospheric processes (larger net evaporation over the Atlantic) or oceanic processes (salinity transport into the Atlantic) remains an outstanding question. Numerical simulations have provided support for both mechanisms; observations of the present climate support a strong role for atmospheric processes as well as some modulation by oceanic processes. A major avenue for future work is the quantification of the various processes at play to identify which mechanisms are primary in different climate states.
0084-6597
327-352
Ferreira, David
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Cessi, Paola
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Coxall, Helen K.
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De Boer, Agatha
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Dijkstra, Henk A.
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Drijfhout, Sybren S.
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Eldevik, Tor
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Harnik, Nili
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Mcmanus, Jerry F.
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Marshall, David P.
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Nilsson, Johan
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Roquet, Fabien
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Schneider, Tapio
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Wills, Robert C.
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Ferreira, David
47a79187-501a-4689-af4e-fc67ddc40c9a
Cessi, Paola
47e9eb22-cabd-4116-8198-f774c03d7142
Coxall, Helen K.
aeeac8f5-cc62-4861-8805-4a2027b33b6c
De Boer, Agatha
8b429578-ea0c-495d-8afd-41f09fa86e7b
Dijkstra, Henk A.
9178b06d-9de5-4f02-b9ff-204b20620291
Drijfhout, Sybren S.
a5c76079-179b-490c-93fe-fc0391aacf13
Eldevik, Tor
45189c84-0e59-405a-8f4b-dea9be05128c
Harnik, Nili
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Mcmanus, Jerry F.
5fee4afb-ee8a-4689-a3ab-780e7ef5f038
Marshall, David P.
128f7d51-26a3-4944-a709-e8342a1c5cfc
Nilsson, Johan
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Roquet, Fabien
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Schneider, Tapio
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Wills, Robert C.
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Ferreira, David, Cessi, Paola, Coxall, Helen K., De Boer, Agatha, Dijkstra, Henk A., Drijfhout, Sybren S., Eldevik, Tor, Harnik, Nili, Mcmanus, Jerry F., Marshall, David P., Nilsson, Johan, Roquet, Fabien, Schneider, Tapio and Wills, Robert C. (2018) Atlantic-Pacific asymmetry in deep water formation. Annual Review of Earth and Planetary Sciences, 46 (1), 327-352. (doi:10.1146/annurev-earth-082517-010045).

Record type: Article

Abstract

While the Atlantic Ocean is ventilated by high-latitude deep water formation and exhibits a pole-to-pole overturning circulation, the Pacific Ocean does not. This asymmetric global overturning pattern has persisted for the past 2–3 million years, with evidence for different ventilation modes in the deeper past. In the current climate, the Atlantic-Pacific asymmetry occurs because the Atlantic is more saline, enabling deep convection. To what extent the salinity contrast between the two basins is dominated by atmospheric processes (larger net evaporation over the Atlantic) or oceanic processes (salinity transport into the Atlantic) remains an outstanding question. Numerical simulations have provided support for both mechanisms; observations of the present climate support a strong role for atmospheric processes as well as some modulation by oceanic processes. A major avenue for future work is the quantification of the various processes at play to identify which mechanisms are primary in different climate states.

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Accepted/In Press date: 1 March 2018
e-pub ahead of print date: 15 March 2018
Published date: May 2018

Identifiers

Local EPrints ID: 421896
URI: http://eprints.soton.ac.uk/id/eprint/421896
ISSN: 0084-6597
PURE UUID: 3db62f96-5b48-4b52-83e7-0a04491beb6e

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Date deposited: 06 Jul 2018 16:30
Last modified: 27 Apr 2022 04:28

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Contributors

Author: David Ferreira
Author: Paola Cessi
Author: Helen K. Coxall
Author: Agatha De Boer
Author: Henk A. Dijkstra
Author: Tor Eldevik
Author: Nili Harnik
Author: Jerry F. Mcmanus
Author: David P. Marshall
Author: Johan Nilsson
Author: Fabien Roquet
Author: Tapio Schneider
Author: Robert C. Wills

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