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The Southern Ocean and its climate in CCSM4

Wilbert Weijer, Bernadette Sloyan, Mathew Maltrud, Nicole Jeffery, Matthew Hecht, Corinne Hartin, Erik van Sebille, Ilana Wainer and Laura Landrum
In Journal of Climate, 2012, volume 25, pages 2652-2675, doi:10.1175/JCLI-D-11-00302.1.

Abstract

The new Community Climate System Model, version 4 (CCSM4) provides a powerful tool to understand and predict the Earth’s climate system. We explore several aspects of the Southern Ocean in the CCSM4 including the surface climatology and interannual variability, simulation of key climate water masses (Antarctic Bottom Water, Subantarctic Mode Water and Antarctic Intermediate Water), the transport and structure of the Antarctic Circumpolar Current, and interbasin exchange via the Agulhas and Tasman leakages and at the Brazil–Malvinas confluence. We find that the CCSM4 has varying degrees of accuracy in the simulation of the climate of the Southern Ocean when compared to observations. This study has identified aspects of the model that warrant further analysis that will result in a more comprehensive understanding of ocean-atmosphere-ice dynamics and interactions that control the Earth's climate and its variability.