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- W2118419715 endingPage "5675" @default.
- W2118419715 startingPage "5665" @default.
- W2118419715 abstract "The correspondence between atmospheric CO2 concentrations and globally averaged surface temperatures in the recent past suggests that this coupling may be of great antiquity. Here, I compare 490 published proxy records of CO2 spanning the Ordovician to Neogene with records of global cool events to evaluate the strength of CO2-temperature coupling over the Phanerozoic (last 542 my). For periods with sufficient CO2 coverage, all cool events are associated with CO2 levels below 1000 ppm. A CO2 threshold of below ∼500 ppm is suggested for the initiation of widespread, continental glaciations, although this threshold was likely higher during the Paleozoic due to a lower solar luminosity at that time. Also, based on data from the Jurassic and Cretaceous, a CO2 threshold of below ∼1000 ppm is proposed for the initiation of cool non-glacial conditions. A pervasive, tight correlation between CO2 and temperature is found both at coarse (10 my timescales) and fine resolutions up to the temporal limits of the data set (million-year timescales), indicating that CO2, operating in combination with many other factors such as solar luminosity and paleogeography, has imparted strong control over global temperatures for much of the Phanerozoic." @default.
- W2118419715 created "2016-06-24" @default.
- W2118419715 creator A5058164073 @default.
- W2118419715 date "2006-12-01" @default.
- W2118419715 modified "2023-09-30" @default.
- W2118419715 title "CO2-forced climate thresholds during the Phanerozoic" @default.
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