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. 2019 Sep 18;5(9):eaax1874. doi: 10.1126/sciadv.aax1874

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Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.

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Fig. 6 — Changes in low-cloud cover (in %) versus the GMST (in °C) in the Eocene atmosphere-only simulations using CAM4 with individual CAM5 physical parameterizations switched on sequentially (Materials and Methods). The physical parameterizations of radiation transfer (rad), cloud microphysics (micro), turbulence and shallow convection (uw), and cloud macrophysics (macro) are tested. For comparison, values of low-cloud cover have been realigned by subtracting the corresponding value in the 1× simulation. For reference, standard atmosphere-only simulations using CAM5 (red filled circles) and CAM4 (orange filled circles) are also shown.