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Volume 11, issue 4 | Copyright
Geosci. Model Dev., 11, 1607-1626, 2018
https://doi.org/10.5194/gmd-11-1607-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Model experiment description paper 24 Apr 2018

Model experiment description paper | 24 Apr 2018

Boundary conditions for the Middle Miocene Climate Transition (MMCT v1.0)

Amanda Frigola1, Matthias Prange1,2, and Michael Schulz1,2 Amanda Frigola et al.
  • 1MARUM Center for Marine Environmental Sciences, University of Bremen, 28359 Bremen, Germany
  • 2Faculty of Geosciences, University of Bremen, 28359 Bremen, Germany

Abstract. The Middle Miocene Climate Transition was characterized by major Antarctic ice sheet expansion and global cooling during the interval  ∼ 15–13Ma. Here we present two sets of boundary conditions for global general circulation models characterizing the periods before (Middle Miocene Climatic Optimum; MMCO) and after (Middle Miocene Glaciation; MMG) the transition. These boundary conditions include Middle Miocene global topography, bathymetry, and vegetation. Additionally, Antarctic ice volume and geometry, sea level, and atmospheric CO2 concentration estimates for the MMCO and the MMG are reviewed. The MMCO and MMG boundary conditions have been successfully applied to the Community Climate System Model version 3 (CCSM3) to provide evidence of their suitability for global climate modeling. The boundary-condition files are available for use as input in a wide variety of global climate models and constitute a valuable tool for modeling studies with a focus on the Middle Miocene.

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The application of climate models to study the Middle Miocene Climate Transition, characterized by major Antarctic ice-sheet expansion and global cooling at the interval 15–13 million years ago, is currently hampered by the lack of boundary conditions. To fill this gap, we compiled two internally consistent sets of boundary conditions, including global topography, bathymetry, vegetation and ice volume, for the periods before and after the transition.
The application of climate models to study the Middle Miocene Climate Transition, characterized...
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