Journal cover Journal topic
Climate of the Past An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/cp-2017-21
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
24 Feb 2017
Review status
A revision of this discussion paper was accepted for the journal Climate of the Past (CP) and is expected to appear here in due course.
Regional and global climate for the mid-Pliocene using CCSM4 and PlioMIP2 boundary conditions
Deepak Chandan and W. Richard Peltier Department of Physics, University of Toronto, 60 St. George Street, Toronto, Ontario, M5S1A7
Abstract. The Pliocene Model Intercomparison Project, Phase 2 (PlioMIP2) is an international collaboration to simulate the climate of the mid-Pliocene interglacial, marine isotope stage KM5c (3.205 Mya), using a wide selection of climate models with the objective of understanding the nature of the warming that is known to have occurred during the broader mid-Pliocene warm period. PlioMIP2 builds upon the successes of PlioMIP by shifting focus onto a specific interglacial and by using a revised set of geographic and orbital boundary conditions. In this paper, we present the details of the mid-Pliocene simulations that we have performed with the Community Climate System Model version 4 (CCSM4), and the enhanced variant of the PlioMIP2 boundary conditions, and discuss the simulated climatology through comparisons to our control simulations, and to proxy reconstructions of the climate of the mid-Pliocene. With the new boundary conditions, the CCSM4 model simulates a mid-Pliocene which is more than twice as warm as that with the boundary conditions used for PlioMIP Phase 1. The warming is more enhanced near the high-latitudes which is where most of the changes to the boundary conditions have been made. The elevated warming in the high-latitudes leads to a better match of the simulated climatology to proxy based reconstructions than what was possible with the previous version of the boundary conditions.

Citation: Chandan, D. and Peltier, W. R.: Regional and global climate for the mid-Pliocene using CCSM4 and PlioMIP2 boundary conditions, Clim. Past Discuss., https://doi.org/10.5194/cp-2017-21, in review, 2017.
Deepak Chandan and W. Richard Peltier
Deepak Chandan and W. Richard Peltier
Deepak Chandan and W. Richard Peltier

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Short summary
This paper discusses the climate of the mid-Pliocene warm period (~ 3.3–3 Mya) that is obtained using coupled-climate simulations at CMIP5 resolution with the CCSM4 model and with the boundary conditions (BCs) that have been prescribed for the PlioMIP2 program. It is found that climate simulations performed with these BCs do a much better job at capturing the patterns of warming that have been inferred from proxy data than what was possible with the BCs for the original PlioMIP program.
This paper discusses the climate of the mid-Pliocene warm period (~ 3.3–3 Mya) that is obtained...
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