edu.ucar.opensky::articles:25226 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-24T22:52:47.616180 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7rv0s94 https://doi.org/10.1594/PANGAEA.939793 https Related Dataset #1 Enhanced terrestrial carbon export from East Antarctica during the early Eocene Enhanced terrestrial carbon export from East Antarctica during the early Eocene 2022-02-01T00:00:00Z publication https://n2t.org/ark:/85065/d7rv0s94 https://doi.org/10.1029/2021PA004348 Inglis, G. N. author Toney, J. L. author Zhu, Jiang author Poulsen, C. J. author Röhl, U. author Jamieson, S. S. R. author Pross, J. author Cramwinckel, M. J. author Krishnan, S. author Pagani, M. author Bijl, P. K. author Bendle, J. author UCAR/NCAR - Library publisher 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. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. None eng geoscientificInformation