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Eocene Greenhouse-Icehouse Transition Carbon Cycle Data Entry ID: NOAA_NCDC_PALEO_2005-056 |
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Summary
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Abstract:
Data set consists of carbonate and stable isotope data across the Eocene "Greenhouse-Icehouse" climate transition, from tropical Pacific ODP cores 1218 and 1219, and calculated Calcite Compensation Depth and 0% isopleth depth. 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 Sicehouse 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. |
Related URL
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Link:
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Description: Access to carbonate and stable isotope data. Link: VIEW RELATED INFORMATION Description: Additional information and links. |
Geographic Coverage
| N: 8.88 | S: 8.88 | E: -135.37 | W: -135.37 |
| Max Depth: 4826 M |
| N: 7.8 | S: 7.8 | E: -142.01 | W: -142.01 |
| Max Depth: 5063 M |
Data Set Citation
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Dataset Originator/Creator:
Aradhna Tripati, J. Backman, H. Elderfield, and P. Ferretti
Dataset Title: Eocene Greenhouse-Icehouse Transition Carbon Cycle Data Dataset Series Name: IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2005-056 Dataset Release Date: August 2005 Dataset Release Place: Boulder, CO Dataset Publisher: IGBP PAGES/World Data Center for Paleoclimatology Issue Identification: 2005-056 Other Citation Details: NOAA/NCDC Paleoclimatology Program Online Resource: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/trip... |
Paleo_Temporal_Coverage
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Paleo Start Date:
55 Ma
Paleo Stop Date: 0 Ma Chrono Unit: |
Location Keywords
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OCEAN
> PACIFIC OCEAN
> CENTRAL PACIFIC OCEAN
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Science Keywords
| CRYOSPHERE >GLACIERS/ICE SHEETS >GLACIERS [Definition] |
| CRYOSPHERE >GLACIERS/ICE SHEETS >ICE SHEETS [Definition] |
| TERRESTRIAL HYDROSPHERE >GLACIERS/ICE SHEETS >GLACIERS [Definition] |
| TERRESTRIAL HYDROSPHERE >GLACIERS/ICE SHEETS >ICE SHEETS [Definition] |
| OCEANS >BATHYMETRY/SEAFLOOR TOPOGRAPHY >WATER DEPTH [Definition] |
| OCEANS >OCEAN CHEMISTRY >BIOGEOCHEMICAL CYCLES [Definition] |
| OCEANS >OCEAN CHEMISTRY >CARBONATE [Definition] |
| OCEANS >OCEAN CHEMISTRY >STABLE ISOTOPES [Definition] |
| OCEANS >OCEAN TEMPERATURE >WATER TEMPERATURE [Definition] |
| PALEOCLIMATE >OCEAN/LAKE RECORDS >ISOTOPES [Definition] |
| PALEOCLIMATE >OCEAN/LAKE RECORDS >MICROFOSSILS [Definition] |
| PALEOCLIMATE >OCEAN/LAKE RECORDS >RADIOCARBON [Definition] |
| OCEANS >MARINE SEDIMENTS >SEDIMENT CHEMISTRY [Definition] |
| OCEANS >OCEAN CHEMISTRY >MARINE GEOCHEMISTRY [Definition] |
| SOLID EARTH >GEOCHEMISTRY >MARINE GEOCHEMICAL PROCESSES [Definition] |
| PALEOCLIMATE >PALEOCLIMATE RECONSTRUCTIONS [Definition] |
| BIOLOGICAL CLASSIFICATION >PROTISTS >AMOEBOIDS >FORAMINIFERS [Definition] |
ISO Topic Category
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CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
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Project
| PAGES >Past Global Changes, IGBP [Information] |
Keywords
| carbon cycle |
| glaciation |
| global warming |
| sediment geochemistry |
| foraminferal geochemistry |
| Eocene |
| carbonate reconstruction |
| stable isotope reconstruction |
Data Set Progress
| COMPLETE |
Originating Center
| NCDC |
Data Center
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World Data Center for Paleoclimatology, Boulder
[Information]
Data Center URL: http://www.ncdc.noaa.gov/paleo/
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Distribution
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Distribution_Media:
online ftp
Distribution_Format: text, excel spreadseet Fees: none |
Personnel
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ARADHNA
TRIPATI Role: INVESTIGATOR Contact Address: Department of Earth Sciences University of Cambridge Downing Street City: Cambridge Postal Code: CB2 3EQ Country: United Kingdom |
Publications/References
Tripati, A., J. Backman, H. Elderfield, and P. Ferretti. 2005. Eocene bipolar
glaciation associated with global carbon cycle changes. Nature, Vol. 436, 21
July 2005. doi:10.1038/nature03874.
glaciation associated with global carbon cycle changes. Nature, Vol. 436, 21
July 2005. doi:10.1038/nature03874.
Creation and Review Dates
DIF Creation Date:
2005-11-17
Last DIF Revision Date:
2005-12-06
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