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.
Review Status
This discussion paper has been under review for the journal Climate of the Past (CP). Please refer to the corresponding final paper in CP.
A Last Glacial Maximum World-Ocean simulation at eddy-permitting resolution – Part 2: Confronting the paleo-proxy data
M. Ballarotta1, K. Döös1, P. Lundberg1, L. Brodeau1, and J. Brandefelt2
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.
 
Search CPD
Discussion Paper
PDF XML
Citation
Share