Carbon cycle change in the Eocene
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...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.738240 2024-09-15T17:43:32+00:00 Carbon cycle change in the Eocene Tripati, Aradhna K Backman, Jan Elderfield, Henry Ferretti, Patrizia 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 2005 application/zip, 8 datasets https://doi.pangaea.de/10.1594/PANGAEA.738240 https://doi.org/10.1594/PANGAEA.738240 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.738240 https://doi.org/10.1594/PANGAEA.738240 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Tripati, Aradhna K; Backman, Jan; Elderfield, Henry; Ferretti, Patrizia (2005): Eocene bipolar glaciation associated with global carbon cycle changes. Nature, 436, 341-346, https://doi.org/10.1038/nature03874 199-1218 199-1219 COMPCORE Composite Core Joides Resolution Leg199 North Pacific Ocean Ocean Drilling Program ODP dataset publication series 2005 ftpangaea https://doi.org/10.1594/PANGAEA.73824010.1038/nature03874 2024-07-24T02:31:20Z 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. Other/Unknown Material Antarc* Antarctica PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-142.015650,-135.366660,8.889630,7.800230) |
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Open Polar |
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PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
199-1218 199-1219 COMPCORE Composite Core Joides Resolution Leg199 North Pacific Ocean Ocean Drilling Program ODP |
spellingShingle |
199-1218 199-1219 COMPCORE Composite Core Joides Resolution Leg199 North Pacific Ocean Ocean Drilling Program ODP Tripati, Aradhna K Backman, Jan Elderfield, Henry Ferretti, Patrizia Carbon cycle change in the Eocene |
topic_facet |
199-1218 199-1219 COMPCORE Composite Core Joides Resolution Leg199 North Pacific Ocean Ocean Drilling Program ODP |
description |
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. |
format |
Other/Unknown Material |
author |
Tripati, Aradhna K Backman, Jan Elderfield, Henry Ferretti, Patrizia |
author_facet |
Tripati, Aradhna K Backman, Jan Elderfield, Henry Ferretti, Patrizia |
author_sort |
Tripati, Aradhna K |
title |
Carbon cycle change in the Eocene |
title_short |
Carbon cycle change in the Eocene |
title_full |
Carbon cycle change in the Eocene |
title_fullStr |
Carbon cycle change in the Eocene |
title_full_unstemmed |
Carbon cycle change in the Eocene |
title_sort |
carbon cycle change in the eocene |
publisher |
PANGAEA |
publishDate |
2005 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.738240 https://doi.org/10.1594/PANGAEA.738240 |
op_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 |
long_lat |
ENVELOPE(-142.015650,-135.366660,8.889630,7.800230) |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Supplement to: Tripati, Aradhna K; Backman, Jan; Elderfield, Henry; Ferretti, Patrizia (2005): Eocene bipolar glaciation associated with global carbon cycle changes. Nature, 436, 341-346, https://doi.org/10.1038/nature03874 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.738240 https://doi.org/10.1594/PANGAEA.738240 |
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.73824010.1038/nature03874 |
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1810490553357303808 |