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Data-model Comparison for the mid-Pliocene Warm Period

Here we consider possible reasons for this data-model discord at high latitudes. These include uncertainties in model boundary conditions (such as CO 2 and orbital forcing), and whether there are local site-specific conditions which need to be accounted for. We also show that the seasonal cycle in mPWP temperatures at these high latitude sites has no modern analogue. This could lead to inaccuracies when comparing model derived mean annual temperatures with quantitative climatic estimates from palaeobotanical data using Nearest Living Relative methods.