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 (10(3)-10(6) years), but its importance during past wa...
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ftncar:oai:drupal-site.org:articles_25226 2024-04-14T08:04:37+00:00 Enhanced terrestrial carbon export from East Antarctica during the early Eocene Inglis, Gordon N. (author) Toney, Jaime L. (author) Zhu, Jiang (author) Poulsen, Christopher J. (author) Röhl, Ursula (author) Jamieson, Stewart S. R. (author) Pross, Jörg (author) Cramwinckel, Margot J. (author) Krishnan, Srinath (author) Pagani, Mark (author) Bijl, Peter K. (author) Bendle, James (author) 2022-02 https://doi.org/10.1029/2021PA004348 en eng Paleoceanography and Paleoclimatology--Paleoceanog and Paleoclimatol--2572-4517--2572-4525 Enhanced terrestrial carbon export from East Antarctica during the early Eocene--10.1594/PANGAEA.939793 articles:25226 doi:10.1029/2021PA004348 ark:/85065/d7rv0s94 Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. article Text 2022 ftncar https://doi.org/10.1029/2021PA004348 2024-03-21T18:00:26Z 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 (10(3)-10(6) 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 (similar to 67 degrees S) to quantify TerrOC burial during the early Eocene (similar to 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 (similar to 54 Ma) and the early Eocene Climatic Optimum (EECO; similar to 53 Ma). This coincides with increased OC mass accumulation rates and indicates enhanced TerrOC burial during the EECO. Leaf wax delta H-2 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. 1852977 Article in Journal/Newspaper Antarc* Antarctica East Antarctica Wilkes Land OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) East Antarctica Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) Paleoceanography and Paleoclimatology 37 2 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
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 (10(3)-10(6) 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 (similar to 67 degrees S) to quantify TerrOC burial during the early Eocene (similar to 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 (similar to 54 Ma) and the early Eocene Climatic Optimum (EECO; similar to 53 Ma). This coincides with increased OC mass accumulation rates and indicates enhanced TerrOC burial during the EECO. Leaf wax delta H-2 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. 1852977 |
author2 |
Inglis, Gordon N. (author) Toney, Jaime L. (author) Zhu, Jiang (author) Poulsen, Christopher J. (author) Röhl, Ursula (author) Jamieson, Stewart S. R. (author) Pross, Jörg (author) Cramwinckel, Margot J. (author) Krishnan, Srinath (author) Pagani, Mark (author) Bijl, Peter K. (author) Bendle, James (author) |
format |
Article in Journal/Newspaper |
title |
Enhanced terrestrial carbon export from East Antarctica during the early Eocene |
spellingShingle |
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://doi.org/10.1029/2021PA004348 |
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 |
Paleoceanography and Paleoclimatology--Paleoceanog and Paleoclimatol--2572-4517--2572-4525 Enhanced terrestrial carbon export from East Antarctica during the early Eocene--10.1594/PANGAEA.939793 articles:25226 doi:10.1029/2021PA004348 ark:/85065/d7rv0s94 |
op_rights |
Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. |
op_doi |
https://doi.org/10.1029/2021PA004348 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
37 |
container_issue |
2 |
_version_ |
1796301267240222720 |