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Clumped isotope evidence for Early Jurassic extreme polar warmth and high climate sensitivity
Climate of the Past
Abstract. Periods of high atmospheric CO2 levels during the Cretaceous–early Paleogene (∼ 140 to 34 Myr ago) were marked by very high polar temperatures and reduced latitudinal gradients relative to the Holocene. These features represent a challenge for most climate models, implying either higher-than-predicted climate sensitivity to atmospheric CO2 or systematic biases or misinterpretations in proxy data. Here, we present a reconstruction of marine temperatures at polar (> 80∘) and middle (∼doi:10.5194/cp-18-435-2022 fatcat:md5kvkrfknf25ozfxxbwpm2hum