Henderiks, Jorijntje; Pagani, Mark (2008): Revised age model of DSDP Site 95-612 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.714600, Supplement to: Henderiks, J; Pagani, M (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
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Abstract:
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.
Project(s):
Deep Sea Drilling Project (DSDP)
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
Event(s):
95-612 * Latitude: 38.820200 * Longitude: -72.773800 * Date/Time: 1983-08-26T00:00:00 * Elevation: -1386.0 m * Penetration: 675.3 m * Recovery: 579.7 m * Location: North Atlantic/SLOPE * Campaign: Leg95 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 72 cores; 674.7 m cored; 0 m drilled; 85.9 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | Ageprofile Datum Description | Ageprof dat des | Henderiks, Jorijntje | FAD = first appearance datum, LAD = last appearance datum | ||
| 3 | Age model | Age model | ka | Henderiks, Jorijntje | Age model, GPTS (geomagnetic polarity timescale), Cande and Kent (1995) | |
| 4 | Reference/source | Reference | Henderiks, Jorijntje |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
30 data points