Sensitivity of Pliocene climate simulations in MRI-CGCM2.3 to respective boundary conditions

TitleSensitivity of Pliocene climate simulations in MRI-CGCM2.3 to respective boundary conditions
Publication TypeJournal Article
Year of Publication2016
AuthorsKamae Y., Yoshida K., Ueda H.
JournalClimate of the Past
Date Published2016/08
Type of ArticleArticle
ISBN Number1814-9324
Accession NumberWOS:000383134600001
Keywordsamplification; Arctic; greenland ice-sheet; Meridional overturning circulation; mid-pliocene; model intercomparison project; north-atlantic; ocean; paleoenvironmental reconstruction; pliomip experimental-design; simple biosphere model; warm period

Accumulations of global proxy data are essential steps for improving reliability of climate model simulations for the Pliocene warming climate. In the Pliocene Model Intercomparison Project phase 2 (PlioMIP2), a part project of the Paleoclimate Modelling Intercomparison Project phase 4, boundary forcing data have been updated from the PlioMIP phase 1 due to recent advances in understanding of oceanic, terrestrial and cryospheric aspects of the Pliocene palaeoenvironment. In this study, sensitivities of Pliocene climate simulations to the newly archived boundary conditions are evaluated by a set of simulations using an atmosphere-ocean coupled general circulation model, MRI-CGCM2.3. The simulated Pliocene climate is warmer than pre-industrial conditions for 2.4 degrees C in global mean, corresponding to 0.6 degrees C warmer than the PlioMIP1 simulation by the identical climate model. Revised orography, lakes, and shrunk ice sheets compared with the PlioMIP1 lead to local and remote influences including snow and sea ice albedo feedback, and pole-ward heat transport due to the atmosphere and ocean that result in additional warming over middle and high latitudes. The amplified higher-latitude warming is supported qualitatively by the proxy evidences, but is still underestimated quantitatively. Physical processes responsible for the global and regional climate changes should be further addressed in future studies under systematic intermodel and data-model comparison frameworks.

Short TitleClim. Past.
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