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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Main Authors: 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
Other Authors: Marine palynology and palaeoceanography, Marine Palynology
Format: Article in Journal/Newspaper
Language:English
Published: 2022
Subjects:
Online Access:https://dspace.library.uu.nl/handle/1874/420451
id ftunivutrecht:oai:dspace.library.uu.nl:1874/420451
record_format openpolar
spelling 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
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