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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/gmd-2017-171
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Model experiment description paper
18 Sep 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).
Boundary conditions for the Middle Miocene Climate Transition (MMCT v1.0)
Amanda Frigola1, Matthias Prange1,2, and Michael Schulz1,2 1MARUM Center for Marine Environmental Sciences, University of Bremen, Bremen, 28359, Germany
2Faculty of Geosciences, University of Bremen, Bremen, 28359, Germany
Abstract. The Middle Miocene Climate Transition was characterized by major Antarctic ice-sheet expansion and global cooling during the interval ~ 15–13 Ma. 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 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.

Citation: Frigola, A., Prange, M., and Schulz, M.: Boundary conditions for the Middle Miocene Climate Transition (MMCT v1.0), Geosci. Model Dev. Discuss., https://doi.org/10.5194/gmd-2017-171, in review, 2017.
Amanda Frigola et al.
Amanda Frigola et al.
Amanda Frigola et al.

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Short summary
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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