Enhanced Terrestrial Carbon Export From East Antarctica During the Early Eocene
Terrestrial organic carbon (TerrOC) acts as an important CO2 sink when transported via rivers to the ocean and sequestered in coastal marine sediments. This mechanism might help to modulate atmospheric CO2 levels over short- and long- timescales (103–106 years), but its importance during past warm c...
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2022
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ftunivutrecht:oai:dspace.library.uu.nl:1874/420451 2023-11-12T04:04:13+01:00 Enhanced Terrestrial Carbon Export From East Antarctica During the Early Eocene Inglis, Gordon N. Toney, Jaime L. Zhu, Jiang Poulsen, Christopher J. Röhl, Ursula Jamieson, Stewart S.R. Pross, Jörg Cramwinckel, Margot J. Krishnan, Srinath Pagani, Mark Bijl, Peter K. Bendle, James Marine palynology and palaeoceanography Marine Palynology 2022-02 application/pdf https://dspace.library.uu.nl/handle/1874/420451 en eng 2572-4517 https://dspace.library.uu.nl/handle/1874/420451 info:eu-repo/semantics/OpenAccess biomarkers cenozoic DeepMIP greenhouse leaf wax lipids Oceanography Atmospheric Science Palaeontology Article 2022 ftunivutrecht 2023-11-01T23:28:28Z Terrestrial organic carbon (TerrOC) acts as an important CO2 sink when transported via rivers to the ocean and sequestered in coastal marine sediments. This mechanism might help to modulate atmospheric CO2 levels over short- and long- timescales (103–106 years), but its importance during past warm climates remains unknown. Here we use terrestrial biomarkers preserved in coastal marine sediment samples from Wilkes Land, East Antarctica (∼67°S) to quantify TerrOC burial during the early Eocene (∼54.4–51.5 Ma). Terrestrial biomarker distributions indicate the delivery of plant-, soil-, and peat-derived organic carbon (OC) into the marine realm. Mass accumulation rates of plant- (long-chain n-alkane) and soil-derived (hopane) biomarkers dramatically increase between the earliest Eocene (∼54 Ma) and the early Eocene Climatic Optimum (EECO; ∼53 Ma). This coincides with increased OC mass accumulation rates and indicates enhanced TerrOC burial during the EECO. Leaf wax δ2H values indicate that the EECO was characterized by wetter conditions relative to the earliest Eocene, suggesting that hydroclimate exerts a first-order control on TerrOC export. Our results indicate that TerrOC burial in coastal marine sediments could have acted as an important negative feedback mechanism during the early Eocene, but also during other warm climate intervals. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Wilkes Land Utrecht University Repository East Antarctica Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
biomarkers cenozoic DeepMIP greenhouse leaf wax lipids Oceanography Atmospheric Science Palaeontology |
spellingShingle |
biomarkers cenozoic DeepMIP greenhouse leaf wax lipids Oceanography Atmospheric Science Palaeontology Inglis, Gordon N. Toney, Jaime L. Zhu, Jiang Poulsen, Christopher J. Röhl, Ursula Jamieson, Stewart S.R. Pross, Jörg Cramwinckel, Margot J. Krishnan, Srinath Pagani, Mark Bijl, Peter K. Bendle, James Enhanced Terrestrial Carbon Export From East Antarctica During the Early Eocene |
topic_facet |
biomarkers cenozoic DeepMIP greenhouse leaf wax lipids Oceanography Atmospheric Science Palaeontology |
description |
Terrestrial organic carbon (TerrOC) acts as an important CO2 sink when transported via rivers to the ocean and sequestered in coastal marine sediments. This mechanism might help to modulate atmospheric CO2 levels over short- and long- timescales (103–106 years), but its importance during past warm climates remains unknown. Here we use terrestrial biomarkers preserved in coastal marine sediment samples from Wilkes Land, East Antarctica (∼67°S) to quantify TerrOC burial during the early Eocene (∼54.4–51.5 Ma). Terrestrial biomarker distributions indicate the delivery of plant-, soil-, and peat-derived organic carbon (OC) into the marine realm. Mass accumulation rates of plant- (long-chain n-alkane) and soil-derived (hopane) biomarkers dramatically increase between the earliest Eocene (∼54 Ma) and the early Eocene Climatic Optimum (EECO; ∼53 Ma). This coincides with increased OC mass accumulation rates and indicates enhanced TerrOC burial during the EECO. Leaf wax δ2H values indicate that the EECO was characterized by wetter conditions relative to the earliest Eocene, suggesting that hydroclimate exerts a first-order control on TerrOC export. Our results indicate that TerrOC burial in coastal marine sediments could have acted as an important negative feedback mechanism during the early Eocene, but also during other warm climate intervals. |
author2 |
Marine palynology and palaeoceanography Marine Palynology |
format |
Article in Journal/Newspaper |
author |
Inglis, Gordon N. Toney, Jaime L. Zhu, Jiang Poulsen, Christopher J. Röhl, Ursula Jamieson, Stewart S.R. Pross, Jörg Cramwinckel, Margot J. Krishnan, Srinath Pagani, Mark Bijl, Peter K. Bendle, James |
author_facet |
Inglis, Gordon N. Toney, Jaime L. Zhu, Jiang Poulsen, Christopher J. Röhl, Ursula Jamieson, Stewart S.R. Pross, Jörg Cramwinckel, Margot J. Krishnan, Srinath Pagani, Mark Bijl, Peter K. Bendle, James |
author_sort |
Inglis, Gordon N. |
title |
Enhanced Terrestrial Carbon Export From East Antarctica During the Early Eocene |
title_short |
Enhanced Terrestrial Carbon Export From East Antarctica During the Early Eocene |
title_full |
Enhanced Terrestrial Carbon Export From East Antarctica During the Early Eocene |
title_fullStr |
Enhanced Terrestrial Carbon Export From East Antarctica During the Early Eocene |
title_full_unstemmed |
Enhanced Terrestrial Carbon Export From East Antarctica During the Early Eocene |
title_sort |
enhanced terrestrial carbon export from east antarctica during the early eocene |
publishDate |
2022 |
url |
https://dspace.library.uu.nl/handle/1874/420451 |
long_lat |
ENVELOPE(120.000,120.000,-69.000,-69.000) |
geographic |
East Antarctica Wilkes Land |
geographic_facet |
East Antarctica Wilkes Land |
genre |
Antarc* Antarctica East Antarctica Wilkes Land |
genre_facet |
Antarc* Antarctica East Antarctica Wilkes Land |
op_relation |
2572-4517 https://dspace.library.uu.nl/handle/1874/420451 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782341093650595840 |