Southern Hemisphere orbital forcing and its effects on CO2 and tropical Pacific climate
The western Pacific warm pool (WPWP) is an important heat source for the atmospheric circulation and influences climate conditions worldwide. Understanding its sensitivity to past radiative perturbations may help better contextualize the magnitudes and patterns of current and projected tropical clim...
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ftarchimer:oai:archimer.ifremer.fr:38504 2023-05-15T18:17:40+02:00 Southern Hemisphere orbital forcing and its effects on CO2 and tropical Pacific climate Tachikawa, K. Timmermann, A. Vidal, Lucas Sonzogni, C. Timm, O. E. 2013 application/pdf https://archimer.ifremer.fr/doc/00274/38504/37010.pdf https://archimer.ifremer.fr/doc/00274/38504/37011.pdf https://doi.org/10.5194/cpd-9-1869-2013 https://archimer.ifremer.fr/doc/00274/38504/ eng eng Copernicus GmbH https://archimer.ifremer.fr/doc/00274/38504/37010.pdf https://archimer.ifremer.fr/doc/00274/38504/37011.pdf doi:10.5194/cpd-9-1869-2013 https://archimer.ifremer.fr/doc/00274/38504/ Author(s) 2013. This work is distributed under the Creative Commons Attribution 3.0 License. info:eu-repo/semantics/openAccess restricted use CC-BY Climate of the Past Discussions (1814-9359) (Copernicus GmbH), 2013 , Vol. 9 , N. 2 , P. 1869-1900 text Publication info:eu-repo/semantics/article 2013 ftarchimer https://doi.org/10.5194/cpd-9-1869-2013 2022-04-12T22:50:01Z The western Pacific warm pool (WPWP) is an important heat source for the atmospheric circulation and influences climate conditions worldwide. Understanding its sensitivity to past radiative perturbations may help better contextualize the magnitudes and patterns of current and projected tropical climate change. Here we present a new Mg/Ca-based sea surface temperature (SST) reconstruction over the past 400 kyr from the Bismarck Sea, off Papua New Guinea, along with results from a transient earth system model simulation. Our results document the primary influence of CO2 forcing on glacial/interglacial WPWP SSTs and secondary effects due to changes in wind-driven tropical boundary currents. In addition to the SST, deep ocean temperature reconstructions from this core are linked with Southern Ocean temperature and sea-ice variations on timescales of ~ 23 kyr. It is proposed that Southern Hemisphere insolation changes serve as pacemaker for sea-ice variations in the Southern Ocean, which in turn modulate windstress curl-driven upwelling of carbon-rich waters, hence controlling atmospheric CO2 and tropical WPWP temperatures. Article in Journal/Newspaper Sea ice Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Bismarck ENVELOPE(-64.000,-64.000,-64.833,-64.833) Curl ENVELOPE(-63.071,-63.071,-70.797,-70.797) Pacific Southern Ocean |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
The western Pacific warm pool (WPWP) is an important heat source for the atmospheric circulation and influences climate conditions worldwide. Understanding its sensitivity to past radiative perturbations may help better contextualize the magnitudes and patterns of current and projected tropical climate change. Here we present a new Mg/Ca-based sea surface temperature (SST) reconstruction over the past 400 kyr from the Bismarck Sea, off Papua New Guinea, along with results from a transient earth system model simulation. Our results document the primary influence of CO2 forcing on glacial/interglacial WPWP SSTs and secondary effects due to changes in wind-driven tropical boundary currents. In addition to the SST, deep ocean temperature reconstructions from this core are linked with Southern Ocean temperature and sea-ice variations on timescales of ~ 23 kyr. It is proposed that Southern Hemisphere insolation changes serve as pacemaker for sea-ice variations in the Southern Ocean, which in turn modulate windstress curl-driven upwelling of carbon-rich waters, hence controlling atmospheric CO2 and tropical WPWP temperatures. |
format |
Article in Journal/Newspaper |
author |
Tachikawa, K. Timmermann, A. Vidal, Lucas Sonzogni, C. Timm, O. E. |
spellingShingle |
Tachikawa, K. Timmermann, A. Vidal, Lucas Sonzogni, C. Timm, O. E. Southern Hemisphere orbital forcing and its effects on CO2 and tropical Pacific climate |
author_facet |
Tachikawa, K. Timmermann, A. Vidal, Lucas Sonzogni, C. Timm, O. E. |
author_sort |
Tachikawa, K. |
title |
Southern Hemisphere orbital forcing and its effects on CO2 and tropical Pacific climate |
title_short |
Southern Hemisphere orbital forcing and its effects on CO2 and tropical Pacific climate |
title_full |
Southern Hemisphere orbital forcing and its effects on CO2 and tropical Pacific climate |
title_fullStr |
Southern Hemisphere orbital forcing and its effects on CO2 and tropical Pacific climate |
title_full_unstemmed |
Southern Hemisphere orbital forcing and its effects on CO2 and tropical Pacific climate |
title_sort |
southern hemisphere orbital forcing and its effects on co2 and tropical pacific climate |
publisher |
Copernicus GmbH |
publishDate |
2013 |
url |
https://archimer.ifremer.fr/doc/00274/38504/37010.pdf https://archimer.ifremer.fr/doc/00274/38504/37011.pdf https://doi.org/10.5194/cpd-9-1869-2013 https://archimer.ifremer.fr/doc/00274/38504/ |
long_lat |
ENVELOPE(-64.000,-64.000,-64.833,-64.833) ENVELOPE(-63.071,-63.071,-70.797,-70.797) |
geographic |
Bismarck Curl Pacific Southern Ocean |
geographic_facet |
Bismarck Curl Pacific Southern Ocean |
genre |
Sea ice Southern Ocean |
genre_facet |
Sea ice Southern Ocean |
op_source |
Climate of the Past Discussions (1814-9359) (Copernicus GmbH), 2013 , Vol. 9 , N. 2 , P. 1869-1900 |
op_relation |
https://archimer.ifremer.fr/doc/00274/38504/37010.pdf https://archimer.ifremer.fr/doc/00274/38504/37011.pdf doi:10.5194/cpd-9-1869-2013 https://archimer.ifremer.fr/doc/00274/38504/ |
op_rights |
Author(s) 2013. This work is distributed under the Creative Commons Attribution 3.0 License. info:eu-repo/semantics/openAccess restricted use |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/cpd-9-1869-2013 |
_version_ |
1766192464729735168 |