Reconstruction of Caribbean Sea surface temperature and salinity fluctuations in response to the Pliocene closure of the Central American Gateway and radiative forcing, using δ44/40Ca, δ18O and Mg/Ca ratios
The δ18O values of planktonic foraminifera increased in the Caribbean by about 0.5‰ relative to the equatorial East Pacific values between 4.6 and 4.2 Ma as a consequence of the closure of the Central American Gateway (CAG). This increase in δ18O can be interpreted either as an increase in Caribbean...
Published in: | Earth and Planetary Science Letters |
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Elsevier
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Online Access: | https://oceanrep.geomar.de/id/eprint/7219/ https://oceanrep.geomar.de/id/eprint/7219/1/1-s2.0-S0012821X04005308-main.pdf https://doi.org/10.1016/j.epsl.2004.09.004 |
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ftoceanrep:oai:oceanrep.geomar.de:7219 2023-05-15T18:01:09+02:00 Reconstruction of Caribbean Sea surface temperature and salinity fluctuations in response to the Pliocene closure of the Central American Gateway and radiative forcing, using δ44/40Ca, δ18O and Mg/Ca ratios Gussone, Nikolaus Eisenhauer, Anton Haug, G. Heuser, A. Müller, A. Tiedemann, Ralf 2004 text https://oceanrep.geomar.de/id/eprint/7219/ https://oceanrep.geomar.de/id/eprint/7219/1/1-s2.0-S0012821X04005308-main.pdf https://doi.org/10.1016/j.epsl.2004.09.004 en eng Elsevier https://oceanrep.geomar.de/id/eprint/7219/1/1-s2.0-S0012821X04005308-main.pdf Gussone, N., Eisenhauer, A. , Haug, G., Heuser, A., Müller, A. and Tiedemann, R. (2004) Reconstruction of Caribbean Sea surface temperature and salinity fluctuations in response to the Pliocene closure of the Central American Gateway and radiative forcing, using δ44/40Ca, δ18O and Mg/Ca ratios. Earth and Planetary Science Letters, 227 (3-4). pp. 201-214. DOI 10.1016/j.epsl.2004.09.004 <https://doi.org/10.1016/j.epsl.2004.09.004>. doi:10.1016/j.epsl.2004.09.004 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2004 ftoceanrep https://doi.org/10.1016/j.epsl.2004.09.004 2023-04-07T14:54:21Z The δ18O values of planktonic foraminifera increased in the Caribbean by about 0.5‰ relative to the equatorial East Pacific values between 4.6 and 4.2 Ma as a consequence of the closure of the Central American Gateway (CAG). This increase in δ18O can be interpreted either as an increase in Caribbean sea surface (mixed layer) salinity (SSS) or as a decrease in sea surface temperatures (SST). This problem represents an ideal situation to apply the recently developed paleotemperature proxy δ44/40Ca together with Mg/Ca and δ18O on the planktic foraminifer Globigerinoides sacculifer from ODP Site 999. Although differences in absolute temperature calibration of δ44/40Ca and Mg/Ca exist, the general pattern is similar indicating a SST decrease of about 2–3 °C between 4.4 and 4.3 Ma followed by an increase in the same order of magnitude between 4.3 and 4.0 Ma. Correcting the δ18O record for this temperature change and assuming that changes in global ice volume are negligible, the salinity-induced planktonic δ18O signal decreased by about 0.4‰ between 4.4 and 4.3 Ma and increased by about 0.9‰ between 4.3 and 4.0 Ma in the Caribbean. The observed temperature and salinity trends are interpreted to reflect the restricted exchange of surface water between the Caribbean and the Pacific in response to the shoaling of the Panamanian Seaway, possibly accompanied by a southward shift of the Intertropical Convergence Zone (ITCZ) between 4.4 and 4.3 Ma. Differences in Mg/Ca- and δ44/40Ca-derived temperatures can be reconciled by corrections for secular variations of the marine Mg/Casw and δ44/40Ca, a salinity effect on the Mg/Ca ratio and a constant temperature offset of ∼2.5 °C between both SST proxy calibrations. Article in Journal/Newspaper Planktonic foraminifera OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Pacific Earth and Planetary Science Letters 227 3-4 201 214 |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
The δ18O values of planktonic foraminifera increased in the Caribbean by about 0.5‰ relative to the equatorial East Pacific values between 4.6 and 4.2 Ma as a consequence of the closure of the Central American Gateway (CAG). This increase in δ18O can be interpreted either as an increase in Caribbean sea surface (mixed layer) salinity (SSS) or as a decrease in sea surface temperatures (SST). This problem represents an ideal situation to apply the recently developed paleotemperature proxy δ44/40Ca together with Mg/Ca and δ18O on the planktic foraminifer Globigerinoides sacculifer from ODP Site 999. Although differences in absolute temperature calibration of δ44/40Ca and Mg/Ca exist, the general pattern is similar indicating a SST decrease of about 2–3 °C between 4.4 and 4.3 Ma followed by an increase in the same order of magnitude between 4.3 and 4.0 Ma. Correcting the δ18O record for this temperature change and assuming that changes in global ice volume are negligible, the salinity-induced planktonic δ18O signal decreased by about 0.4‰ between 4.4 and 4.3 Ma and increased by about 0.9‰ between 4.3 and 4.0 Ma in the Caribbean. The observed temperature and salinity trends are interpreted to reflect the restricted exchange of surface water between the Caribbean and the Pacific in response to the shoaling of the Panamanian Seaway, possibly accompanied by a southward shift of the Intertropical Convergence Zone (ITCZ) between 4.4 and 4.3 Ma. Differences in Mg/Ca- and δ44/40Ca-derived temperatures can be reconciled by corrections for secular variations of the marine Mg/Casw and δ44/40Ca, a salinity effect on the Mg/Ca ratio and a constant temperature offset of ∼2.5 °C between both SST proxy calibrations. |
format |
Article in Journal/Newspaper |
author |
Gussone, Nikolaus Eisenhauer, Anton Haug, G. Heuser, A. Müller, A. Tiedemann, Ralf |
spellingShingle |
Gussone, Nikolaus Eisenhauer, Anton Haug, G. Heuser, A. Müller, A. Tiedemann, Ralf Reconstruction of Caribbean Sea surface temperature and salinity fluctuations in response to the Pliocene closure of the Central American Gateway and radiative forcing, using δ44/40Ca, δ18O and Mg/Ca ratios |
author_facet |
Gussone, Nikolaus Eisenhauer, Anton Haug, G. Heuser, A. Müller, A. Tiedemann, Ralf |
author_sort |
Gussone, Nikolaus |
title |
Reconstruction of Caribbean Sea surface temperature and salinity fluctuations in response to the Pliocene closure of the Central American Gateway and radiative forcing, using δ44/40Ca, δ18O and Mg/Ca ratios |
title_short |
Reconstruction of Caribbean Sea surface temperature and salinity fluctuations in response to the Pliocene closure of the Central American Gateway and radiative forcing, using δ44/40Ca, δ18O and Mg/Ca ratios |
title_full |
Reconstruction of Caribbean Sea surface temperature and salinity fluctuations in response to the Pliocene closure of the Central American Gateway and radiative forcing, using δ44/40Ca, δ18O and Mg/Ca ratios |
title_fullStr |
Reconstruction of Caribbean Sea surface temperature and salinity fluctuations in response to the Pliocene closure of the Central American Gateway and radiative forcing, using δ44/40Ca, δ18O and Mg/Ca ratios |
title_full_unstemmed |
Reconstruction of Caribbean Sea surface temperature and salinity fluctuations in response to the Pliocene closure of the Central American Gateway and radiative forcing, using δ44/40Ca, δ18O and Mg/Ca ratios |
title_sort |
reconstruction of caribbean sea surface temperature and salinity fluctuations in response to the pliocene closure of the central american gateway and radiative forcing, using δ44/40ca, δ18o and mg/ca ratios |
publisher |
Elsevier |
publishDate |
2004 |
url |
https://oceanrep.geomar.de/id/eprint/7219/ https://oceanrep.geomar.de/id/eprint/7219/1/1-s2.0-S0012821X04005308-main.pdf https://doi.org/10.1016/j.epsl.2004.09.004 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
https://oceanrep.geomar.de/id/eprint/7219/1/1-s2.0-S0012821X04005308-main.pdf Gussone, N., Eisenhauer, A. , Haug, G., Heuser, A., Müller, A. and Tiedemann, R. (2004) Reconstruction of Caribbean Sea surface temperature and salinity fluctuations in response to the Pliocene closure of the Central American Gateway and radiative forcing, using δ44/40Ca, δ18O and Mg/Ca ratios. Earth and Planetary Science Letters, 227 (3-4). pp. 201-214. DOI 10.1016/j.epsl.2004.09.004 <https://doi.org/10.1016/j.epsl.2004.09.004>. doi:10.1016/j.epsl.2004.09.004 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.epsl.2004.09.004 |
container_title |
Earth and Planetary Science Letters |
container_volume |
227 |
container_issue |
3-4 |
container_start_page |
201 |
op_container_end_page |
214 |
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1766170501967773696 |