We gratefully acknowledge the financial support of the South African Water Research Commission, the National Research Foundation, and the University of Cape Town. We thank the Laboratoire d'Océanographie Dynamique et de Climatologie (LODYC–Paris 6) for use of products from the OPA 8 version of the OGC model. We also thank Akiko Hayashi and Victor Zlotnicki from Caltech/JPL for providing the Topex/Poseidon products. NCEP reanalysis data are provided by the NOAA–CIRES Climate Diagnostics Center, Boulder, Colorado (available online at http://www.cdc.noaa.gov/).
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