Carbon isotopes and Pa∕Th response to forced circulation changes: a model perspective
Understanding the ocean circulation changes associated with abrupt climate events is key to better assessing climate variability and understanding its different natural modes. Sedimentary Pa∕Th , benthic δ 13 C and Δ 14 C are common proxies used to reconstruct past circulation flow rate and ventilat...
Published in: | Climate of the Past |
---|---|
Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2020
|
Subjects: | |
Online Access: | https://doi.org/10.5194/cp-16-867-2020 https://doaj.org/article/1e9da8bf6acd49608d4a23608bcba868 |
id |
ftdoajarticles:oai:doaj.org/article:1e9da8bf6acd49608d4a23608bcba868 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:1e9da8bf6acd49608d4a23608bcba868 2023-05-15T17:24:24+02:00 Carbon isotopes and Pa∕Th response to forced circulation changes: a model perspective L. Missiaen N. Bouttes D. M. Roche J.-C. Dutay A. Quiquet C. Waelbroeck S. Pichat J.-Y. Peterschmitt 2020-05-01T00:00:00Z https://doi.org/10.5194/cp-16-867-2020 https://doaj.org/article/1e9da8bf6acd49608d4a23608bcba868 EN eng Copernicus Publications https://www.clim-past.net/16/867/2020/cp-16-867-2020.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-16-867-2020 1814-9324 1814-9332 https://doaj.org/article/1e9da8bf6acd49608d4a23608bcba868 Climate of the Past, Vol 16, Pp 867-883 (2020) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2020 ftdoajarticles https://doi.org/10.5194/cp-16-867-2020 2022-12-31T03:22:57Z Understanding the ocean circulation changes associated with abrupt climate events is key to better assessing climate variability and understanding its different natural modes. Sedimentary Pa∕Th , benthic δ 13 C and Δ 14 C are common proxies used to reconstruct past circulation flow rate and ventilation. To overcome the limitations of each proxy taken separately, a better approach is to produce multiproxy measurements on a single sediment core. Yet, different proxies can provide conflicting information about past ocean circulation. Thus, modelling them in a consistent physical framework has become necessary to assess the geographical pattern and the timing and sequence of the multiproxy response to abrupt circulation changes. We have implemented a representation of the 231 Pa and 230 Th tracers into the model of intermediate complexity iLOVECLIM, which already included δ 13 C and Δ 14 C . We have further evaluated the response of these three ocean circulation proxies to a classical abrupt circulation reduction obtained by freshwater addition in the Nordic Seas under preindustrial boundary conditions. The proxy response is shown to cluster in modes that resemble the modern Atlantic water masses. The clearest and most coherent response is obtained in the deep (> 2000 m) northwest Atlantic, where δ 13 C and Δ 14 C significantly decrease, while Pa∕Th increases. This is consistent with observational data across millennial-scale events of the last glacial. Interestingly, while in marine records, except in rare instances, the phase relationship between these proxies remains unclear due to large dating uncertainties, in the model the bottom water carbon isotope ( δ 13 C and Δ 14 C ) response lags behind the sedimentary Pa∕Th response by a few hundred years. Article in Journal/Newspaper Nordic Seas Northwest Atlantic Directory of Open Access Journals: DOAJ Articles Climate of the Past 16 3 867 883 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 L. Missiaen N. Bouttes D. M. Roche J.-C. Dutay A. Quiquet C. Waelbroeck S. Pichat J.-Y. Peterschmitt Carbon isotopes and Pa∕Th response to forced circulation changes: a model perspective |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
Understanding the ocean circulation changes associated with abrupt climate events is key to better assessing climate variability and understanding its different natural modes. Sedimentary Pa∕Th , benthic δ 13 C and Δ 14 C are common proxies used to reconstruct past circulation flow rate and ventilation. To overcome the limitations of each proxy taken separately, a better approach is to produce multiproxy measurements on a single sediment core. Yet, different proxies can provide conflicting information about past ocean circulation. Thus, modelling them in a consistent physical framework has become necessary to assess the geographical pattern and the timing and sequence of the multiproxy response to abrupt circulation changes. We have implemented a representation of the 231 Pa and 230 Th tracers into the model of intermediate complexity iLOVECLIM, which already included δ 13 C and Δ 14 C . We have further evaluated the response of these three ocean circulation proxies to a classical abrupt circulation reduction obtained by freshwater addition in the Nordic Seas under preindustrial boundary conditions. The proxy response is shown to cluster in modes that resemble the modern Atlantic water masses. The clearest and most coherent response is obtained in the deep (> 2000 m) northwest Atlantic, where δ 13 C and Δ 14 C significantly decrease, while Pa∕Th increases. This is consistent with observational data across millennial-scale events of the last glacial. Interestingly, while in marine records, except in rare instances, the phase relationship between these proxies remains unclear due to large dating uncertainties, in the model the bottom water carbon isotope ( δ 13 C and Δ 14 C ) response lags behind the sedimentary Pa∕Th response by a few hundred years. |
format |
Article in Journal/Newspaper |
author |
L. Missiaen N. Bouttes D. M. Roche J.-C. Dutay A. Quiquet C. Waelbroeck S. Pichat J.-Y. Peterschmitt |
author_facet |
L. Missiaen N. Bouttes D. M. Roche J.-C. Dutay A. Quiquet C. Waelbroeck S. Pichat J.-Y. Peterschmitt |
author_sort |
L. Missiaen |
title |
Carbon isotopes and Pa∕Th response to forced circulation changes: a model perspective |
title_short |
Carbon isotopes and Pa∕Th response to forced circulation changes: a model perspective |
title_full |
Carbon isotopes and Pa∕Th response to forced circulation changes: a model perspective |
title_fullStr |
Carbon isotopes and Pa∕Th response to forced circulation changes: a model perspective |
title_full_unstemmed |
Carbon isotopes and Pa∕Th response to forced circulation changes: a model perspective |
title_sort |
carbon isotopes and pa∕th response to forced circulation changes: a model perspective |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/cp-16-867-2020 https://doaj.org/article/1e9da8bf6acd49608d4a23608bcba868 |
genre |
Nordic Seas Northwest Atlantic |
genre_facet |
Nordic Seas Northwest Atlantic |
op_source |
Climate of the Past, Vol 16, Pp 867-883 (2020) |
op_relation |
https://www.clim-past.net/16/867/2020/cp-16-867-2020.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-16-867-2020 1814-9324 1814-9332 https://doaj.org/article/1e9da8bf6acd49608d4a23608bcba868 |
op_doi |
https://doi.org/10.5194/cp-16-867-2020 |
container_title |
Climate of the Past |
container_volume |
16 |
container_issue |
3 |
container_start_page |
867 |
op_container_end_page |
883 |
_version_ |
1766115373875200000 |