Surface ocean warming and acidification driven by rapid carbon release precedes Paleocene-Eocene Thermal Maximum
Science Advances
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Abstract
The Paleocene-Eocene Thermal Maximum (PETM) is recognized by a major negative carbon isotope (δ13C) excursion (CIE) signifying an injection of isotopically light carbon into exogenic reservoirs, the mass, source, and tempo of which continue to be debated. Evidence of a transient precursor carbon release(s) has been identified in a few localities, although it remains equivocal whether there is a global signal. Here, we present foraminiferal δ13C records from a marine continental margin section, which reveal a 1.0 to 1.5‰ negative pre-onset excursion (POE), and concomitant rise in sea surface temperature of at least 2°C and a decline in ocean pH. The recovery of both δ13C and pH before the CIE onset and apparent absence of a POE in deep-sea records suggests a rapid (< ocean mixing time scales) carbon release, followed by recovery driven by deep-sea mixing. Carbon released during the POE is therefore likely more similar to ongoing anthropogenic emissions in mass and rate than the main CIE.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Surface ocean warming and acidification driven by rapid carbon release precedes Paleocene-Eocene Thermal Maximum |
| Series title | Science Advances |
| DOI | 10.1126/sciadv.abg1025 |
| Volume | 8 |
| Issue | 11 |
| Year Published | 2022 |
| Language | English |
| Publisher | Science |
| Contributing office(s) | Florence Bascom Geoscience Center |
| Description | eabg1025, 13 p. |
| Google Analytic Metrics | Metrics page |