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Climate of the Past An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/cp-2020-144
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-2020-144
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  20 Nov 2020

20 Nov 2020

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This preprint is currently under review for the journal CP.

Impact of dust in PMIP-CMIP6 mid-Holocene simulations with the IPSL model

Pascale Braconnot1, Samuel Albani1,2, Yves Balkanski1, Anne Cozic1, Masa Kageyama1, Adriana Sima3, Olivier Marti1, and Jean-Yves Peterschmitt1 Pascale Braconnot et al.
  • 1LSCE-IPSL, unité mixte CEA-CNRS-UVSQ, Université Paris-Saclay, Orme des Merisiers, bât. 714, 91191 Gif-sur Yvette Cedex, France
  • 2Department of Environmental and Earth Sciences, University of Milano-Bicocca, Milano, Italy
  • 3LMD-IPSL, 4 place Jussieu, Université Paris-Sorbonne, 75 005 Paris Cedex 05

Abstract. We investigate the impact of reduced dust during mid-Holocene using simulations with the IPSL model. We consider simulations where dust is either prescribed from an IPSL PI simulation or from CESM simulations (Albani et al., 2015). In addition, we also consider an extreme mid Holocene case where dust is suppressed. We focus on the estimation of the dust radiative effects and the relative responses of the African and Indian monsoon, showing how local dust forcing or orography affect atmospheric temperature profiles, humidity and precipitation. Compared to previous simulations with the IPSL model the results show only minor improvements for the mid Holocene simulation over large regions despite the fact that the IPSLCM6-LR version of the IPSL model is in better agreement with modern observations. The effect of dust has little impact on the model-data comparisons. Our analyses confirm the peculiar role of dust radiative effect over bright surfaces such as African deserts compared to other regions due to the change of sign of the dust radiative effect at the top-of-atmosphere for high surface albedo. We also highlight a strong dependence on the dust pattern. In particular the relative dust forcing between West Africa and the middle east impacts the relative climate response between India and Africa and between Africa, the western tropical Atlantic and the Atlantic meridional circulation. Dust patterns should thus receive a wider attention to fully understand the changes in the dust cycle and forcing during mid Holocene.

Pascale Braconnot et al.

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Short summary
We investigate how the mid Holocene dust reduction affects Earth's energetics from a suite of climate simulations. Our analyses confirm the peculiar role of dust radiative effect over bright surfaces such as African deserts. We highlight a strong dependence on the dust pattern. The relative dust forcing between West Africa and the middle east impacts the relative response of Indian and African monsoons and between the western tropical Atlantic and the Atlantic meridional circulation.
We investigate how the mid Holocene dust reduction affects Earth's energetics from a suite of...
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