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 lo...
Published in: | Global and Planetary Change |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
2002
|
Subjects: | |
Online Access: | https://eprints.soton.ac.uk/6068/ |
id |
ftsouthampton:oai:eprints.soton.ac.uk:6068 |
---|---|
record_format |
openpolar |
spelling |
ftsouthampton:oai:eprints.soton.ac.uk:6068 2023-07-30T04:01:19+02:00 On modelling present-day and last glacial maximum oceanic delta 18O distributions Wadley, M.R. Bigg, G.R. Rohling, E.J. Payne, A.J. 2002 https://eprints.soton.ac.uk/6068/ unknown 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 <http://dx.doi.org/10.1016/S0921-8181(01)00084-4>). Article PeerReviewed 2002 ftsouthampton https://doi.org/10.1016/S0921-8181(01)00084-4 2023-07-09T20:29:08Z 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 Article in Journal/Newspaper Arctic Bering Strait North Atlantic Deep Water North Atlantic University of Southampton: e-Prints Soton Arctic Bering Strait Global and Planetary Change 32 2-3 89 109 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
unknown |
description |
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 |
format |
Article in Journal/Newspaper |
author |
Wadley, M.R. Bigg, G.R. Rohling, E.J. Payne, A.J. |
spellingShingle |
Wadley, M.R. Bigg, G.R. Rohling, E.J. Payne, A.J. On modelling present-day and last glacial maximum oceanic delta 18O distributions |
author_facet |
Wadley, M.R. Bigg, G.R. Rohling, E.J. Payne, A.J. |
author_sort |
Wadley, M.R. |
title |
On modelling present-day and last glacial maximum oceanic delta 18O distributions |
title_short |
On modelling present-day and last glacial maximum oceanic delta 18O distributions |
title_full |
On modelling present-day and last glacial maximum oceanic delta 18O distributions |
title_fullStr |
On modelling present-day and last glacial maximum oceanic delta 18O distributions |
title_full_unstemmed |
On modelling present-day and last glacial maximum oceanic delta 18O distributions |
title_sort |
on modelling present-day and last glacial maximum oceanic delta 18o distributions |
publishDate |
2002 |
url |
https://eprints.soton.ac.uk/6068/ |
geographic |
Arctic Bering Strait |
geographic_facet |
Arctic Bering Strait |
genre |
Arctic Bering Strait North Atlantic Deep Water North Atlantic |
genre_facet |
Arctic Bering Strait North Atlantic Deep Water North Atlantic |
op_relation |
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 <http://dx.doi.org/10.1016/S0921-8181(01)00084-4>). |
op_doi |
https://doi.org/10.1016/S0921-8181(01)00084-4 |
container_title |
Global and Planetary Change |
container_volume |
32 |
container_issue |
2-3 |
container_start_page |
89 |
op_container_end_page |
109 |
_version_ |
1772812069061525504 |