Problems with using radiocarbon to infer ocean ventilation rates for past and present climates
The oceanic C-14 distribution reflects mainly the circulation pattern and intensity, but is also sensitive to the exchange processes at the air-sea interface. In order to separate the relative contributions of both effects (that might have changed in the past), we incorporate in an ocean general cir...
Published in: | Earth and Planetary Science Letters |
---|---|
Main Authors: | , , |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier Science Bv
1999
|
Subjects: | |
Online Access: | http://hdl.handle.net/2078.1/44697 https://doi.org/10.1016/S0012-821X(98)00255-6 |
id |
ftunivlouvain:oai:dial.uclouvain.be:boreal:44697 |
---|---|
record_format |
openpolar |
spelling |
ftunivlouvain:oai:dial.uclouvain.be:boreal:44697 2024-05-19T07:30:39+00:00 Problems with using radiocarbon to infer ocean ventilation rates for past and present climates Campin, JM. Fichefet, Thierry Duplessy, JC. UCL UCL - SST/ELI/ELIC - Earth & Climate 1999 http://hdl.handle.net/2078.1/44697 https://doi.org/10.1016/S0012-821X(98)00255-6 eng eng Elsevier Science Bv boreal:44697 http://hdl.handle.net/2078.1/44697 doi:10.1016/S0012-821X(98)00255-6 urn:ISSN:0012-821X urn:EISSN:1385-013X info:eu-repo/semantics/restrictedAccess Earth and Planetary Science Letters, Vol. 165, no. 1, p. 17-24 (1999) ocean circulation models paleoceanography last glacial maximum C-14 air-sea interface info:eu-repo/semantics/article 1999 ftunivlouvain https://doi.org/10.1016/S0012-821X(98)00255-6 2024-04-24T01:48:21Z The oceanic C-14 distribution reflects mainly the circulation pattern and intensity, but is also sensitive to the exchange processes at the air-sea interface. In order to separate the relative contributions of both effects (that might have changed in the past), we incorporate in an ocean general circulation model two passive tracers, namely, the normalized radiocarbon ratio (Delta(14)C) and the actual age of water. We quantify, for both present and glacial conditions, the decoupling between the C-14 ventilation rate and the circulation intensity as the difference between the simulated C-14 age and actual age of water. The C-14 age of the model Antarctic Bottom Water (ABBW) appears systematically older than its actual age, the discrepancy being larger for glacial conditions because of the more extensive Antarctic sea-ice cover. Our results suggest that the AABW flow rate could have been stronger than today during the Last Glacial Maximum, contrary to what might be inferred from a naive interpretation of C-14 measurements in deep-sea sediment cores. (C) 1999 Elsevier Science B.V. All rights reserved. Article in Journal/Newspaper Antarc* Antarctic Sea ice DIAL@UCLouvain (Université catholique de Louvain) Earth and Planetary Science Letters 165 1 17 24 |
institution |
Open Polar |
collection |
DIAL@UCLouvain (Université catholique de Louvain) |
op_collection_id |
ftunivlouvain |
language |
English |
topic |
ocean circulation models paleoceanography last glacial maximum C-14 air-sea interface |
spellingShingle |
ocean circulation models paleoceanography last glacial maximum C-14 air-sea interface Campin, JM. Fichefet, Thierry Duplessy, JC. Problems with using radiocarbon to infer ocean ventilation rates for past and present climates |
topic_facet |
ocean circulation models paleoceanography last glacial maximum C-14 air-sea interface |
description |
The oceanic C-14 distribution reflects mainly the circulation pattern and intensity, but is also sensitive to the exchange processes at the air-sea interface. In order to separate the relative contributions of both effects (that might have changed in the past), we incorporate in an ocean general circulation model two passive tracers, namely, the normalized radiocarbon ratio (Delta(14)C) and the actual age of water. We quantify, for both present and glacial conditions, the decoupling between the C-14 ventilation rate and the circulation intensity as the difference between the simulated C-14 age and actual age of water. The C-14 age of the model Antarctic Bottom Water (ABBW) appears systematically older than its actual age, the discrepancy being larger for glacial conditions because of the more extensive Antarctic sea-ice cover. Our results suggest that the AABW flow rate could have been stronger than today during the Last Glacial Maximum, contrary to what might be inferred from a naive interpretation of C-14 measurements in deep-sea sediment cores. (C) 1999 Elsevier Science B.V. All rights reserved. |
author2 |
UCL UCL - SST/ELI/ELIC - Earth & Climate |
format |
Article in Journal/Newspaper |
author |
Campin, JM. Fichefet, Thierry Duplessy, JC. |
author_facet |
Campin, JM. Fichefet, Thierry Duplessy, JC. |
author_sort |
Campin, JM. |
title |
Problems with using radiocarbon to infer ocean ventilation rates for past and present climates |
title_short |
Problems with using radiocarbon to infer ocean ventilation rates for past and present climates |
title_full |
Problems with using radiocarbon to infer ocean ventilation rates for past and present climates |
title_fullStr |
Problems with using radiocarbon to infer ocean ventilation rates for past and present climates |
title_full_unstemmed |
Problems with using radiocarbon to infer ocean ventilation rates for past and present climates |
title_sort |
problems with using radiocarbon to infer ocean ventilation rates for past and present climates |
publisher |
Elsevier Science Bv |
publishDate |
1999 |
url |
http://hdl.handle.net/2078.1/44697 https://doi.org/10.1016/S0012-821X(98)00255-6 |
genre |
Antarc* Antarctic Sea ice |
genre_facet |
Antarc* Antarctic Sea ice |
op_source |
Earth and Planetary Science Letters, Vol. 165, no. 1, p. 17-24 (1999) |
op_relation |
boreal:44697 http://hdl.handle.net/2078.1/44697 doi:10.1016/S0012-821X(98)00255-6 urn:ISSN:0012-821X urn:EISSN:1385-013X |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/S0012-821X(98)00255-6 |
container_title |
Earth and Planetary Science Letters |
container_volume |
165 |
container_issue |
1 |
container_start_page |
17 |
op_container_end_page |
24 |
_version_ |
1799488249351110656 |