Not logged in
PANGAEA.
Data Publisher for Earth & Environmental Science

Tripati, Aradhna K; Backman, Jan; Elderfield, Henry; Ferretti, Patrizia (2005): Carbon cycle change in the Eocene [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.738240, Supplement to: Tripati, AK et al. (2005): Eocene bipolar glaciation associated with global carbon cycle changes. Nature, 436, 341-346, https://doi.org/10.1038/nature03874

Always quote citation above when using data! You can download the citation in several formats below.

RIS CitationBibTeX CitationShow MapGoogle Earth

Abstract:
The transition from the extreme global warmth of the early Eocene 'greenhouse' climate ~55 million years ago to the present glaciated state is one of the most prominent changes in Earth's climatic evolution. It is widely accepted that large ice sheets first appeared on Antarctica ~34 million years ago, coincident with decreasing atmospheric carbon dioxide concentrations and a deepening of the calcite compensation depth in the world's oceans, and that glaciation in the Northern Hemisphere began much later, between 10 and 6 million years ago. Here we present records of sediment and foraminiferal geochemistry covering the greenhouse-icehouse climate transition. We report evidence for synchronous deepening and subsequent oscillations in the calcite compensation depth in the tropical Pacific and South Atlantic oceans from ~42 million years ago, with a permanent deepening 34 million years ago. The most prominent variations in the calcite compensation depth coincide with changes in seawater oxygen isotope ratios of up to 1.5 per mil, suggesting a lowering of global sea level through significant storage of ice in both hemispheres by at least 100 to 125 metres. Variations in benthic carbon isotope ratios of up to ~1.4 per mil occurred at the same time, indicating large changes in carbon cycling. We suggest that the greenhouse-icehouse transition was closely coupled to the evolution of atmospheric carbon dioxide, and that negative carbon cycle feedbacks may have prevented the permanent establishment of large ice sheets earlier than 34 million years ago.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 8.453870 * Median Longitude: -138.026256 * South-bound Latitude: 7.800230 * West-bound Longitude: -142.015650 * North-bound Latitude: 8.889630 * East-bound Longitude: -135.366660
Date/Time Start: 2001-11-14T00:00:00 * Date/Time End: 2001-11-23T00:00:00
Event(s):
199-1218 * Latitude: 8.889630 * Longitude: -135.366660 * Date/Time: 2001-11-14T00:00:00 * Elevation: -4827.2 m * Penetration: 797.1 m * Recovery: 723.7 m * Location: North Pacific Ocean * Campaign: Leg199 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 80 cores; 735.1 m cored; 62 m drilled; 98.5% recovery
199-1219 * Latitude: 7.800230 * Longitude: -142.015650 * Date/Time: 2001-11-23T00:00:00 * Elevation: -5063.4 m * Penetration: 408.8 m * Recovery: 379 m * Location: North Pacific Ocean * Campaign: Leg199 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 42 cores; 387.8 m cored; 0 m drilled; 97.7% recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
8 datasets

Download Data

Download ZIP file containing all datasets as tab-delimited text — use the following character encoding:

Datasets listed in this publication series

  1. Tripati, AK; Backman, J; Elderfield, H et al. (2005): Reconstructed depth of the 0% carbonate isopleth for the Equatorial Pacific. https://doi.org/10.1594/PANGAEA.315953
  2. Tripati, AK; Backman, J; Elderfield, H et al. (2005): Reconstructed depth of the 0% carbonate isopleth for the South Atlantic. https://doi.org/10.1594/PANGAEA.315954
  3. Tripati, AK; Backman, J; Elderfield, H et al. (2005): Bulk carbonate isotope analysis for ODP Site 199-1218. https://doi.org/10.1594/PANGAEA.316051
  4. Tripati, AK; Backman, J; Elderfield, H et al. (2005): Carbonate content for ODP Site 199-1218. https://doi.org/10.1594/PANGAEA.316120
  5. Tripati, AK; Backman, J; Elderfield, H et al. (2005): Reconstructed bottom water temperature and seawater oxygen isotope values for ODP Site 199-1218. https://doi.org/10.1594/PANGAEA.316055
  6. Tripati, AK; Backman, J; Elderfield, H et al. (2005): Bulk carbonate isotope analysis for ODP Site 199-1219. https://doi.org/10.1594/PANGAEA.316053
  7. Tripati, AK; Backman, J; Elderfield, H et al. (2005): Carbonate content for ODP Site 199-1219. https://doi.org/10.1594/PANGAEA.316121
  8. Tripati, AK; Backman, J; Elderfield, H et al. (2005): Reconstructed Equatorial Pacific carbonate compensation depth. https://doi.org/10.1594/PANGAEA.315963