EGU21-4802
https://doi.org/10.5194/egusphere-egu21-4802
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Data-model Comparison for the mid-Pliocene Warm Period

Julia Tindall1, Alan Haywood1, Ulrich Salzmann2, and Aisling Dolan1
Julia Tindall et al.
  • 1School of Earth and Environment,, University of Leeds, Leeds, UK.
  • 2Department of Geography and Environmental Sciences, Northumbria University, Newcastle, UK.

Modelling results from PlioMIP2 (the Pliocene Model Intercomparison Project Phase 2) focussing on MIS KM5c; ~3.205Ma, suggest that global mean surface air temperature was 1.7 – 5.2 °C higher than the preindustrial.  This warming was amplified at the poles and over land.  The results are in reasonable agreement with paleodata over the ocean.   

Over the land the situation is more complicated.  Model and data are in very good agreement at lower latitudes, however at high latitudes an initial data-model comparison shows much warmer mPWP temperatures from data than from models.   

Here we consider possible reasons for this data-model discord at high latitudes.  These include uncertainties in model boundary conditions (such as CO2 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.

How to cite: Tindall, J., Haywood, A., Salzmann, U., and Dolan, A.: Data-model Comparison for the mid-Pliocene Warm Period, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-4802, https://doi.org/10.5194/egusphere-egu21-4802, 2021.

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