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Clim. Past Discuss., 9, 329-350, 2013
www.clim-past-discuss.net/9/329/2013/ doi:10.5194/cpd-9-329-2013 © Author(s) 2013. This work is distributed under the Creative Commons Attribution 3.0 License. |
A Last Glacial Maximum World-Ocean simulation at eddy-permitting resolution – Part 2: Confronting the paleo-proxy data
1Department of Meteorology/Oceanography, Stockholm University, 106 91 Stockholm, Sweden
2Department of Mechanics, KTH (Royal Institute of Technology), 106 91 Stockholm, Sweden
Abstract. Previous investigations concerning the design of an eddy-permitting LGM oceanic simulation are here extended with focus on whether this type of simulation is capable of improving the numerical results with regard to the available paleo-proxy reconstructions. Consequently, an eddy-permitting and two coarse-grid simulations of the same LGM period are confronted with a dataset from the Multiproxy Approach for the Reconstruction of the Glacial Ocean Sea Surface Temperatures (MARGO SSTs) and a number of sea-ice reconstructions. From a statistical analysis it was found that the eddy-permitting simulation does not significantly improve the SST representation with regard to the paleo-reconstructions. The western boundary currents are better resolved in the high-resolution experiment than in the coarse simulations, but, although these more detailed SST structures yield a locally improved consistency between modelled predictions and proxies, they do not contribute significantly to the global statistical score. As in the majority of the PMIP2 simulations, the modelled sea-ice conditions are still inconsistent with the paleo-reconstructions, probably due to the choice of the model equilibrium.
Citation: Ballarotta, M., Döös, K., Lundberg, P., Brodeau, L., and Brandefelt, J.: A Last Glacial Maximum World-Ocean simulation at eddy-permitting resolution – Part 2: Confronting the paleo-proxy data, Clim. Past Discuss., 9, 329-350, doi:10.5194/cpd-9-329-2013, 2013.