Paleocene–Eocene thermal maximum

Uncommon card · No. 186080

The Paleocene–Eocene thermal maximum (PETM), alternatively Eocene thermal maximum 1 (ETM1) and formerly known as the Initial Eocene or Late Paleocene thermal maximum, was a geologically brief time interval characterized by a 5–8 °C (9–14 °F) global average temperature rise and massive input of carbon into the ocean and atmosphere. The event began, now formally codified, at the precise time boundary between the Paleocene and Eocene geological epochs. The PETM lasted about 200,000 years, and occurred about 56 million years ago. The PETM arguably represents the best past analogue by which to understand how global warming and the carbon cycle operate in a greenhouse world. The time interval is marked by a prominent negative excursion in carbon stable isotope (δ13C) records from around the globe; more specifically, a large decrease in the 13C/12C ratio of marine and terrestrial carbonates and organic carbon has been found and correlated across hundreds of locations. The magnitude and timing...

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