This paper emerged through a “trial and error” process, over 10 years. One of us (JSG) wishes to thank the other coauthors (and Dr. Linda Waterman and Ms. Yan-Li Zhang, coauthors of earlier, unsuccessful efforts) for their patience. We also wish to thank Professor Qinyu Liu, for making the visits of Zhang and Hu to Tasmania possible; and Drs. Stephen Griffies and Trevor McDougall, for help in identifying the model problems. This study was supported by a program from the National Natural Science Foundation of China (NSFC) under Grant 40576006.
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