A transient rise in tropical sea surface temperature during the Paleocene-Eocene Thermal Maximum
Articolo
Data di Pubblicazione:
2003
Citazione:
A transient rise in tropical sea surface temperature during the Paleocene-Eocene Thermal Maximum / J.C. Zachos, M.W. Wara, S. Bohaty, M.L. Delaney, M.R. Petrizzo, A. Brill, T.J. Bralower, I. Premoli-Silva. - In: SCIENCE. - ISSN 0036-8075. - 302:5650(2003), pp. 1551-1554. [10.1126/science.1090110]
Abstract:
The Paleocene-Eocene Thermal Maximum (PETM) has been attributed to a rapid rise in greenhouse gas levels. If so, warming should have occurred at all latitudes, although amplified toward the poles. Existing records reveal an increase in high-latitude sea surface temperatures (SSTs) (8° to 10°C) and in bottom water temperatures (4° to 5°C). To date, however, the character of the tropical SST response during this event remains unconstrained. Here we address this deficiency by using paired oxygen isotope and minor element (magnesium/calcium) ratios of planktonic foraminifera from a tropical Pacific core to estimate changes in SST. Using mixed-layer foraminifera, we found that the combined proxies imply a 4° to 5°C rise in Pacific SST during the PETM. These results would necessitate a rise in atmospheric pCO 2 to levels three to four times as high as those estimated for the late Pateocene.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
oceanic methane hydrate; planktonic-foraminifera; latest paleocene; atmospheric CO2
Elenco autori:
J.C. Zachos, M.W. Wara, S. Bohaty, M.L. Delaney, M.R. Petrizzo, A. Brill, T.J. Bralower, I. Premoli-Silva
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