δ 18 O seasonality of planktonic foraminifera from Southern Ocean sediment traps: Latitudinal gradients and implications for paleoclimate reconstructions
The oxygen isotopic record obtained from Globigerina bulloides, Globorotalia inflata, and Neogloboquadrina pachyderma (s.) was analysed for 5 sediment traps moored in the Southern Ocean and Southwest Pacific. The traps extend from Subtropical to the Polar Frontal environments, providing the first an...
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2005
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Online Access: | https://doi.org/10.1016/j.marmicro.2005.02.008 http://ecite.utas.edu.au/39444 |
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ftunivtasecite:oai:ecite.utas.edu.au:39444 2023-05-15T17:15:01+02:00 δ 18 O seasonality of planktonic foraminifera from Southern Ocean sediment traps: Latitudinal gradients and implications for paleoclimate reconstructions King, AL Howard, W 2005 https://doi.org/10.1016/j.marmicro.2005.02.008 http://ecite.utas.edu.au/39444 en eng Elsevier Science BV http://dx.doi.org/10.1016/j.marmicro.2005.02.008 King, AL and Howard, W, δ 18 O seasonality of planktonic foraminifera from Southern Ocean sediment traps: Latitudinal gradients and implications for paleoclimate reconstructions, Marine Micropaleontology, 56, (1-2) pp. 1-24. ISSN 0377-8398 (2005) [Refereed Article] http://ecite.utas.edu.au/39444 Earth Sciences Oceanography Chemical Oceanography Refereed Article PeerReviewed 2005 ftunivtasecite https://doi.org/10.1016/j.marmicro.2005.02.008 2019-12-13T21:16:53Z The oxygen isotopic record obtained from Globigerina bulloides, Globorotalia inflata, and Neogloboquadrina pachyderma (s.) was analysed for 5 sediment traps moored in the Southern Ocean and Southwest Pacific. The traps extend from Subtropical to the Polar Frontal environments, providing the first analysis of seasonal foraminiferal 18O records from these latitudes. Comparison between the foraminiferal records and various equations for predicted 18O of calcite reveals that the predicted 18O is best captured by the equations of Epstein et al. (1953) [Epstein, S., Buchsbaum, R., Lowenstam, H.A., Urey, H.C., 1953. Revised carbonate-water isotopic temperature scale. Geological Society of America Bulletin 64, 1315-1326.] and Kim and O'Neil (1997) [Kim, S.-T., O'Neil, J.R., 1997. Equilibrium and non-equilibrium oxygen isotope effects in synthetic carbonates. Geochimica et Cosmochimica Acta 61, 3461-3475.]. The Epstein equation shows a constant offset from the 18O of G. bulloides and N. pachyderma (s.) across the full range of latitudes. The seasonal range in 18O values for these two species implies a near-surface habitat across all sites, while G. inflata most likely dwells at 50 m depth. A significant finding in this study was that offsets from predicted 18O for G. bulloides do not correlate to changes in the carbonate ion concentration. This suggests that [CO3 2-] in and of itself may not capture the full range of carbonate chemistry conditions in the marine system. This sediment trap deployment also reveals distinct seasonal flux patterns for each species. Comparison between flux-weighted isotopic values calculated from the sediment traps and the isotopic composition of nearby surface sediments indicates that the sedimentary records retain this seasonal imprint. At the 51S site, G. bulloides has a spring flux peak while N. pachyderma (s.) is dominated by summer production. The imprint of these differing seasonal production patterns on the flux-weighted 18O values results in more depleted 18O for N. pachyderma (s.) than for G. bulloides. Interpretations of N. pachyderma (s.) isotopic composition as a record of subsurface conditions may therefore need to be refined, with implications for interpretation of depleted glacial 13C for this species (Sigman & Boyle, 2000) [Sigman, D.M., Boyle, E.A., 2000. Glacial/interglacial variations in atmospheric carbon dioxide. Nature 407, 859-869.]. 2005 Elsevier B.V. All rights reserved. Article in Journal/Newspaper Neogloboquadrina pachyderma Planktonic foraminifera Southern Ocean eCite UTAS (University of Tasmania) Pacific Southern Ocean Urey ENVELOPE(134.983,134.983,68.300,68.300) Marine Micropaleontology 56 1-2 1 24 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Chemical Oceanography |
spellingShingle |
Earth Sciences Oceanography Chemical Oceanography King, AL Howard, W δ 18 O seasonality of planktonic foraminifera from Southern Ocean sediment traps: Latitudinal gradients and implications for paleoclimate reconstructions |
topic_facet |
Earth Sciences Oceanography Chemical Oceanography |
description |
The oxygen isotopic record obtained from Globigerina bulloides, Globorotalia inflata, and Neogloboquadrina pachyderma (s.) was analysed for 5 sediment traps moored in the Southern Ocean and Southwest Pacific. The traps extend from Subtropical to the Polar Frontal environments, providing the first analysis of seasonal foraminiferal 18O records from these latitudes. Comparison between the foraminiferal records and various equations for predicted 18O of calcite reveals that the predicted 18O is best captured by the equations of Epstein et al. (1953) [Epstein, S., Buchsbaum, R., Lowenstam, H.A., Urey, H.C., 1953. Revised carbonate-water isotopic temperature scale. Geological Society of America Bulletin 64, 1315-1326.] and Kim and O'Neil (1997) [Kim, S.-T., O'Neil, J.R., 1997. Equilibrium and non-equilibrium oxygen isotope effects in synthetic carbonates. Geochimica et Cosmochimica Acta 61, 3461-3475.]. The Epstein equation shows a constant offset from the 18O of G. bulloides and N. pachyderma (s.) across the full range of latitudes. The seasonal range in 18O values for these two species implies a near-surface habitat across all sites, while G. inflata most likely dwells at 50 m depth. A significant finding in this study was that offsets from predicted 18O for G. bulloides do not correlate to changes in the carbonate ion concentration. This suggests that [CO3 2-] in and of itself may not capture the full range of carbonate chemistry conditions in the marine system. This sediment trap deployment also reveals distinct seasonal flux patterns for each species. Comparison between flux-weighted isotopic values calculated from the sediment traps and the isotopic composition of nearby surface sediments indicates that the sedimentary records retain this seasonal imprint. At the 51S site, G. bulloides has a spring flux peak while N. pachyderma (s.) is dominated by summer production. The imprint of these differing seasonal production patterns on the flux-weighted 18O values results in more depleted 18O for N. pachyderma (s.) than for G. bulloides. Interpretations of N. pachyderma (s.) isotopic composition as a record of subsurface conditions may therefore need to be refined, with implications for interpretation of depleted glacial 13C for this species (Sigman & Boyle, 2000) [Sigman, D.M., Boyle, E.A., 2000. Glacial/interglacial variations in atmospheric carbon dioxide. Nature 407, 859-869.]. 2005 Elsevier B.V. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
King, AL Howard, W |
author_facet |
King, AL Howard, W |
author_sort |
King, AL |
title |
δ 18 O seasonality of planktonic foraminifera from Southern Ocean sediment traps: Latitudinal gradients and implications for paleoclimate reconstructions |
title_short |
δ 18 O seasonality of planktonic foraminifera from Southern Ocean sediment traps: Latitudinal gradients and implications for paleoclimate reconstructions |
title_full |
δ 18 O seasonality of planktonic foraminifera from Southern Ocean sediment traps: Latitudinal gradients and implications for paleoclimate reconstructions |
title_fullStr |
δ 18 O seasonality of planktonic foraminifera from Southern Ocean sediment traps: Latitudinal gradients and implications for paleoclimate reconstructions |
title_full_unstemmed |
δ 18 O seasonality of planktonic foraminifera from Southern Ocean sediment traps: Latitudinal gradients and implications for paleoclimate reconstructions |
title_sort |
δ 18 o seasonality of planktonic foraminifera from southern ocean sediment traps: latitudinal gradients and implications for paleoclimate reconstructions |
publisher |
Elsevier Science BV |
publishDate |
2005 |
url |
https://doi.org/10.1016/j.marmicro.2005.02.008 http://ecite.utas.edu.au/39444 |
long_lat |
ENVELOPE(134.983,134.983,68.300,68.300) |
geographic |
Pacific Southern Ocean Urey |
geographic_facet |
Pacific Southern Ocean Urey |
genre |
Neogloboquadrina pachyderma Planktonic foraminifera Southern Ocean |
genre_facet |
Neogloboquadrina pachyderma Planktonic foraminifera Southern Ocean |
op_relation |
http://dx.doi.org/10.1016/j.marmicro.2005.02.008 King, AL and Howard, W, δ 18 O seasonality of planktonic foraminifera from Southern Ocean sediment traps: Latitudinal gradients and implications for paleoclimate reconstructions, Marine Micropaleontology, 56, (1-2) pp. 1-24. ISSN 0377-8398 (2005) [Refereed Article] http://ecite.utas.edu.au/39444 |
op_doi |
https://doi.org/10.1016/j.marmicro.2005.02.008 |
container_title |
Marine Micropaleontology |
container_volume |
56 |
container_issue |
1-2 |
container_start_page |
1 |
op_container_end_page |
24 |
_version_ |
1766073158012502016 |