We thank the Global Climate Modeling group at the Max Planck Institute for Meteorology, Hamburg, Germany, especially Dr. E. Roeckner and Ms. Monika Esch, for providing access to data from their simulations. The corresponding author particularly thanks Dr. Jia-Yuh Yu for useful comments. This work was supported under National Science Council Grant 93-2111-M-001-001, the National Science Foundation Grant ATM-0082529, and the National Oceanic and Atmospheric Administration Grant NA05OAR431134.
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