Revised age model of DSDP Site 95-612
Alkenone-based Cenozoic records of the partial pressure of atmospheric carbon dioxide (pCO2) are founded on the carbon isotope fractionation that occurred during marine photosynthesis (epsilon [p37:2]). However, the magnitude of epsilon [p37:2] is also influenced by phytoplankton cell size - a consi...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.714600 2024-09-15T18:24:01+00:00 Revised age model of DSDP Site 95-612 Henderiks, Jorijntje Pagani, Mark LATITUDE: 38.820200 * LONGITUDE: -72.773800 * DATE/TIME START: 1983-08-26T00:00:00 * DATE/TIME END: 1983-08-26T00:00:00 * MINIMUM DEPTH, sediment/rock: 138.50 m * MAXIMUM DEPTH, sediment/rock: 547.91 m 2008 text/tab-separated-values, 30 data points https://doi.pangaea.de/10.1594/PANGAEA.714600 https://doi.org/10.1594/PANGAEA.714600 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.714600 https://doi.org/10.1594/PANGAEA.714600 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Henderiks, Jorijntje; Pagani, Mark (2008): Coccolithophore cell size and the Paleogene decline in atmospheric CO2. Earth and Planetary Science Letters, 269(3-4), 576-584, https://doi.org/10.1016/j.epsl.2008.03.016 95-612 Age model GPTS (geomagnetic polarity timescale) Cande and Kent (1995) Ageprofile Datum Description Deep Sea Drilling Project DEPTH sediment/rock DRILL Drilling/drill rig DSDP Glomar Challenger Leg95 North Atlantic/SLOPE Reference/source dataset 2008 ftpangaea https://doi.org/10.1594/PANGAEA.71460010.1016/j.epsl.2008.03.016 2024-07-24T02:31:30Z Alkenone-based Cenozoic records of the partial pressure of atmospheric carbon dioxide (pCO2) are founded on the carbon isotope fractionation that occurred during marine photosynthesis (epsilon [p37:2]). However, the magnitude of epsilon [p37:2] is also influenced by phytoplankton cell size - a consideration lacking in previous alkenone-based CO2 estimates. In this study, we reconstruct cell size trends in ancient alkenone-producing coccolithophores (the reticulofenestrids) to test the influence that cell size variability played in determining epsilon [p37:2] trends and pCO2 estimates during the middle Eocene to early Miocene. At the investigated deep-sea sites, the reticulofenestrids experienced high diversity and largest mean cell sizes during the late Eocene, followed by a long-term decrease in maximum cell size since the earliest Oligocene. Decreasing haptophyte cell sizes do not account for the long-term increase in the stable carbon isotopic composition of alkenones and associated decrease in epsilon [p37:2] values during the Paleogene, supporting the conclusion that the secular pattern of epsilon [p37:2] values is primarily controlled by decreasing CO2 concentration since the earliest Oligocene. Further, given the physiology of modern alkenone producers, and considering the timings of coccolithophorid cell size change, extinctions, and changes in reconstructed pCO2 and temperature, we speculate that the selection of smaller reticulofenestrid cells during the Oligocene primarily reflects an adaptive response to increased [CO2(aq)] limitation. Dataset North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-72.773800,-72.773800,38.820200,38.820200) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
95-612 Age model GPTS (geomagnetic polarity timescale) Cande and Kent (1995) Ageprofile Datum Description Deep Sea Drilling Project DEPTH sediment/rock DRILL Drilling/drill rig DSDP Glomar Challenger Leg95 North Atlantic/SLOPE Reference/source |
spellingShingle |
95-612 Age model GPTS (geomagnetic polarity timescale) Cande and Kent (1995) Ageprofile Datum Description Deep Sea Drilling Project DEPTH sediment/rock DRILL Drilling/drill rig DSDP Glomar Challenger Leg95 North Atlantic/SLOPE Reference/source Henderiks, Jorijntje Pagani, Mark Revised age model of DSDP Site 95-612 |
topic_facet |
95-612 Age model GPTS (geomagnetic polarity timescale) Cande and Kent (1995) Ageprofile Datum Description Deep Sea Drilling Project DEPTH sediment/rock DRILL Drilling/drill rig DSDP Glomar Challenger Leg95 North Atlantic/SLOPE Reference/source |
description |
Alkenone-based Cenozoic records of the partial pressure of atmospheric carbon dioxide (pCO2) are founded on the carbon isotope fractionation that occurred during marine photosynthesis (epsilon [p37:2]). However, the magnitude of epsilon [p37:2] is also influenced by phytoplankton cell size - a consideration lacking in previous alkenone-based CO2 estimates. In this study, we reconstruct cell size trends in ancient alkenone-producing coccolithophores (the reticulofenestrids) to test the influence that cell size variability played in determining epsilon [p37:2] trends and pCO2 estimates during the middle Eocene to early Miocene. At the investigated deep-sea sites, the reticulofenestrids experienced high diversity and largest mean cell sizes during the late Eocene, followed by a long-term decrease in maximum cell size since the earliest Oligocene. Decreasing haptophyte cell sizes do not account for the long-term increase in the stable carbon isotopic composition of alkenones and associated decrease in epsilon [p37:2] values during the Paleogene, supporting the conclusion that the secular pattern of epsilon [p37:2] values is primarily controlled by decreasing CO2 concentration since the earliest Oligocene. Further, given the physiology of modern alkenone producers, and considering the timings of coccolithophorid cell size change, extinctions, and changes in reconstructed pCO2 and temperature, we speculate that the selection of smaller reticulofenestrid cells during the Oligocene primarily reflects an adaptive response to increased [CO2(aq)] limitation. |
format |
Dataset |
author |
Henderiks, Jorijntje Pagani, Mark |
author_facet |
Henderiks, Jorijntje Pagani, Mark |
author_sort |
Henderiks, Jorijntje |
title |
Revised age model of DSDP Site 95-612 |
title_short |
Revised age model of DSDP Site 95-612 |
title_full |
Revised age model of DSDP Site 95-612 |
title_fullStr |
Revised age model of DSDP Site 95-612 |
title_full_unstemmed |
Revised age model of DSDP Site 95-612 |
title_sort |
revised age model of dsdp site 95-612 |
publisher |
PANGAEA |
publishDate |
2008 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.714600 https://doi.org/10.1594/PANGAEA.714600 |
op_coverage |
LATITUDE: 38.820200 * LONGITUDE: -72.773800 * DATE/TIME START: 1983-08-26T00:00:00 * DATE/TIME END: 1983-08-26T00:00:00 * MINIMUM DEPTH, sediment/rock: 138.50 m * MAXIMUM DEPTH, sediment/rock: 547.91 m |
long_lat |
ENVELOPE(-72.773800,-72.773800,38.820200,38.820200) |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Supplement to: Henderiks, Jorijntje; Pagani, Mark (2008): Coccolithophore cell size and the Paleogene decline in atmospheric CO2. Earth and Planetary Science Letters, 269(3-4), 576-584, https://doi.org/10.1016/j.epsl.2008.03.016 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.714600 https://doi.org/10.1594/PANGAEA.714600 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.71460010.1016/j.epsl.2008.03.016 |
_version_ |
1810464319374098432 |