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Climate of the Past An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/cp-2019-102
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-2019-102
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 19 Aug 2019

Submitted as: research article | 19 Aug 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Climate of the Past (CP).

PlioMIP2 simulation with NorESM-L and NorESM1-F

Xiangyu Li1,2, Chuncheng Guo2, Zhongshi Zhang3,2,4, Odd Helge Otterå2, and Ran Zhang1 Xiangyu Li et al.
  • 1Climate Change Research Center, Chinese Academy of Sciences, Beijing 100029, China
  • 2NORCE Norwegian Research Centre, Bjerknes Centre for Climate Research, Bergen, Norway
  • 3Department of Atmospheric Science, School of Environmental Studies, China University of Geosciences, Wuhan, China
  • 4Nansen-Zhu International Research Centre, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China

Abstract. As a continuation of the Pliocene Model Intercomparison Project (PlioMIP), PlioMIP Phase 2 (PlioMIP2) coordinates a wide selection of different climate model experiments aimed at further improving our understanding of the climate and environments during the late Pliocene with updated boundary conditions. Here we report on PlioMIP2 simulations carried out by the two versions of the Norwegian Earth System Model (NorESM), NorESM-L and NorESM1-F, with updated boundary conditions derived from the Pliocene Research, Interpretation and Synoptic Mapping version 4 (PRISM4). The two NorESM versions both produce warmer and wetter Pliocene climate. Relative to the pre-industrial period, the simulated Pliocene global mean surface air temperature is 2.1 ℃ higher with NorESM-L and 1.7 ℃ higher with NorESM1-F, respectively, and the corresponding global mean sea surface temperature enhances by 1.5 ℃ and 1.2 ℃. The simulated precipitation for the Pliocene increases by 0.14 mm day−1 globally in both model versions, with large responses in the tropics and especially in monsoon regions. In the simulated warmer and wetter Pliocene world, Atlantic meridional overturning circulation (AMOC) become deeper and stronger, with the maximum AMOC levels increasing by ~ 9 % (with NorESM-L) and ~ 15 % (with NorESM1-F), while the meridional overturning circulation slightly strengthens in the Pacific and Indian Oceans. Although the two models produce similar Pliocene climates, they also generate some differences, in particular for the Southern Ocean, which should be investigated through the PlioMIP2 in the future. As compared to PlioMIP1, the simulated Pliocene warming with NorESM-L is weaker in PlioMIP2, but otherwise show very similar responses.

Xiangyu Li et al.
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Short summary
Here we report the PlioMIP2 simulations by two versions of the Norwegian Earth System Model (NorESM), NorESM-L and NorESM1-F, with updated boundary conditions derived from PRISM4. The two NorESM versions both produce warmer and wetter Pliocene climate with deeper and stronger Atlantic meridional overturning circulation. Compared to PlioMIP1, the Pliocene warming simulated in PlioMIP2 is less with NorESM-L, which is likely attributable to the closure of seaways at the northern high latitudes.
Here we report the PlioMIP2 simulations by two versions of the Norwegian Earth System Model...
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