Session: Warm Climates (Mid-Holocene, Last interglacial, Deep-time, Pliocene)
Author: Stephen Hunter / S.Hunter@leeds.ac.uk / University of Leeds
Co-author: Julia Tindall, University of Leeds;
Alan Haywood, University of Leeds;
Aisling Dolan, University of Leeds;
We present an overview of the UK’s HadCM3 climate modelling contribution to the Pliocene Model Intercomparison Project Phase 2 (PlioMIP2) as part of PMIP4. We outline the process of setting up HadCM3 with the enhanced PRISM4 boundary conditions and discuss in detail the assumptions and choices made. In particular we focus on 1) efforts to maintain modelling consistency with previous PlioMIP HadCM3 modelling, 2) efforts to minimise potential sources of residual model drift, and 3) understanding the limitations of the model when simulating palaeogeographic changes. We then proceed to outline the process of HadCM3 and vegetation model spin-up and quantify the equilibrium state. We then present data from the final climatological mean state of the two core experiments - the Pre-industrial control (E280) and Pliocene control (Eoi400) - and compare PlioMIP2 against PlioMIP HadCM3.