Causes of ice age intensification across the Mid-Pleistocene Transition - Archive ouverte HAL
Article Dans Une Revue Proceedings of the National Academy of Sciences of the United States of America Année : 2017

Causes of ice age intensification across the Mid-Pleistocene Transition

Résumé

Significance Conflicting sets of hypotheses highlight either the role of ice sheets or atmospheric carbon dioxide (CO 2 ) in causing the increase in duration and severity of ice age cycles ∼1 Mya during the Mid-Pleistocene Transition (MPT). We document early MPT CO 2 cycles that were smaller than during recent ice age cycles. Using model simulations, we attribute this to post-MPT increase in glacial-stage dustiness and its effect on Southern Ocean productivity. Detailed analysis reveals the importance of CO 2 climate forcing as a powerful positive feedback that magnified MPT climate change originally triggered by a change in ice sheet dynamics. These findings offer insights into the close coupling of climate, oceans, and ice sheets within the Earth System.

Dates et versions

hal-04698938 , version 1 (16-09-2024)

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Citer

Thomas B Chalk, Mathis Hain, Gavin Foster, Eelco Rohling, Philip Sexton, et al.. Causes of ice age intensification across the Mid-Pleistocene Transition. Proceedings of the National Academy of Sciences of the United States of America, 2017, 114 (50), pp.13114-13119. ⟨10.1073/pnas.1702143114⟩. ⟨hal-04698938⟩
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