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On modelling present-day and last glacial maximum oceanic delta 18O distributions

On modelling present-day and last glacial maximum oceanic delta 18O distributions
On modelling present-day and last glacial maximum oceanic delta 18O distributions
Present-day (PD) and Last Glacial Maximum (LGM) simulations of the global ocean are presented, with the oxygen-18 isotope included as a passive tracer. The gradient of the PD North Atlantic surface 18O:salinity relationship is found to result from different processes at low and high latitudes. At low latitudes, the balance between surface 18O flux and oceanic advection and mixing sets the surface 18O:salinity gradient, whereas at high latitudes, mixing between 18O-depleted runoff and precipitation to the Arctic, Bering Strait inflow, and waters from lower latitudes, controls the 18O:salinity gradient. The importance of the Bering Strait contribution has not previously been recognised. These gradients change significantly at the LGM, and are found to be sensitive to both Arctic runoff 18O concentrations and changes in oceanic advection, particularly the rate of exchange of North Atlantic deep water with the global ocean. It is concluded that reconstructions of past climates from records of sea surface 18O based on analogues of the PD 18O:salinity relationship are likely to be in error
WOCE, OXYGEN ISOTOPES, MODELLING, LAST GLACIAL MAXIMUM, PALAEOCEANOGRAPHY
0921-8181
89-109
Wadley, M.R.
f9c899cb-5362-44a2-a616-8b11eef66133
Bigg, G.R.
c48f5e24-e49d-485c-82ea-f78736789867
Rohling, E.J.
a2a27ef2-fcce-4c71-907b-e692b5ecc685
Payne, A.J.
ce816e45-23ce-4805-a987-ab26e17b3bab
Wadley, M.R.
f9c899cb-5362-44a2-a616-8b11eef66133
Bigg, G.R.
c48f5e24-e49d-485c-82ea-f78736789867
Rohling, E.J.
a2a27ef2-fcce-4c71-907b-e692b5ecc685
Payne, A.J.
ce816e45-23ce-4805-a987-ab26e17b3bab

Wadley, M.R., Bigg, G.R., Rohling, E.J. and Payne, A.J. (2002) On modelling present-day and last glacial maximum oceanic delta 18O distributions. Global and Planetary Change, 32 (2/3), 89-109. (doi:10.1016/S0921-8181(01)00084-4).

Record type: Article

Abstract

Present-day (PD) and Last Glacial Maximum (LGM) simulations of the global ocean are presented, with the oxygen-18 isotope included as a passive tracer. The gradient of the PD North Atlantic surface 18O:salinity relationship is found to result from different processes at low and high latitudes. At low latitudes, the balance between surface 18O flux and oceanic advection and mixing sets the surface 18O:salinity gradient, whereas at high latitudes, mixing between 18O-depleted runoff and precipitation to the Arctic, Bering Strait inflow, and waters from lower latitudes, controls the 18O:salinity gradient. The importance of the Bering Strait contribution has not previously been recognised. These gradients change significantly at the LGM, and are found to be sensitive to both Arctic runoff 18O concentrations and changes in oceanic advection, particularly the rate of exchange of North Atlantic deep water with the global ocean. It is concluded that reconstructions of past climates from records of sea surface 18O based on analogues of the PD 18O:salinity relationship are likely to be in error

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More information

Published date: 2002
Keywords: WOCE, OXYGEN ISOTOPES, MODELLING, LAST GLACIAL MAXIMUM, PALAEOCEANOGRAPHY

Identifiers

Local EPrints ID: 6068
URI: http://eprints.soton.ac.uk/id/eprint/6068
ISSN: 0921-8181
PURE UUID: 14d71fdf-3dc7-4efe-8b8a-ea9cd80b0706
ORCID for E.J. Rohling: ORCID iD orcid.org/0000-0001-5349-2158

Catalogue record

Date deposited: 10 Jun 2004
Last modified: 10 Nov 2021 02:45

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Contributors

Author: M.R. Wadley
Author: G.R. Bigg
Author: E.J. Rohling ORCID iD
Author: A.J. Payne

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