Rapid acidification of the ocean during the Paleocene-Eocene thermal maximum.

Zachos, J. C. and Rohl, U. and Schellenberg, S. A. and Hodell, D. A. and Sluijs, A. and Kelly, D. C. and Thomas, E. and Nicolo, M. and Raffi, I. and Lourens, L. J. and McCarren, H. and Kroon, D. (2005) Rapid acidification of the ocean during the Paleocene-Eocene thermal maximum. Science, 308 (5728). pp. 1611-1615. ISSN 0036-8075 DOI 10.1126/science.1109004

[img] PDF
Hodell.pdf
Restricted to Registered users only

Download (262kB)

Abstract

The Paleocene-Eocene thermal maximum (PETM) has been attributed to the rapid release of È2000 109 metric tons of carbon in the form of methane. In theory, oxidation and ocean absorption of this carbon should have lowered deep-sea pH, thereby triggering a rapid (G10,000-year) shoaling of the calcite compensation depth (CCD), followed by gradual recovery. Here we present geochemical data from five new South Atlantic deep-sea sections that constrain the timing and extent of massive sea-floor carbonate dissolution coincident with the PETM. The sections, from between 2.7 and 4.8 kilometers water depth, are marked by a prominent clay layer, the character of which indicates that the CCD shoaled rapidly (G10,000 years) by more than 2 kilometers and recovered gradually (9100,000 years). These findings indicate that a large mass of carbon (d2000 109 metric tons of carbon) dissolved in the ocean at the Paleocene-Eocene boundary and that permanent sequestration of this carbon occurred through silicate weathering feedback.

Item Type: Article
Uncontrolled Keywords: NIL AREP;
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title: Science
Volume: 308
Page Range: pp. 1611-1615
Identification Number: 10.1126/science.1109004
Depositing User: Sarah Humbert
Date Deposited: 12 Aug 2010 10:59
Last Modified: 23 Jul 2013 10:00
URI: http://eprints.esc.cam.ac.uk/id/eprint/1889

Actions (login required)

View Item View Item

About cookies