Barite Accumulation rates across Paleocene-Eocene Thermal Maximum (PETM), supplement to: Ma, Zhongwu; Gray, E; Thomas, Ellen; Murphy, Brandon; Zachos, James C; Paytan, Adina (2014): Carbon sequestration during the Palaeocene–Eocene Thermal Maximum by an efficient biological pump. Nature Geoscience, 7(5), 382-388


Barite accumulation rates (BAR) have been measured from 12 DSDP/ODP site globally (DSDP site 525, 549 and ODP site 690, 738, 1051, 1209, 1215, 1220, 1221, 1263,1265 and 1266A) to reconstruct the export production across Paleocene Eocene Thermal Maximum (PETM) around 55.9 million year ago. Our results suggesting a general increase in export productivity. We propose that changes in marine ecosystems, resulting from high atmospheric partial pressure of CO2 and ocean acidification, led to enhanced carbon export from the photic zone to depth, thereby increasing the efficiency of the biological pump. We estimate that an annual carbon export flux out of the euphotic zone and into the deep ocean waters could have amounted to about 15 Gt during the PETM. About 0.4% of this carbon is expected to have entered the refractory dissolved organic pool, where it could be sequestered from the atmosphere for tens of thousands of years. Our estimates are consistent with the amount of carbon redistribution expected for the recovery from the PETM.

Metadata Access
Creator Murphy, Brandon;Paytan, Adina;Zachos, James C;Ma, Zhongwu;Gray, E;Thomas, Ellen
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2014
Rights Creative Commons Attribution 3.0 Unported (CC-BY)
Language English
Resource Type Supplementary Dataset
Format text/tab-separated-values
Discipline Earth System Research
Spatial Coverage (65S-49N,148W-159E)
Temporal Point 1980-06-10T11:59:59Z