This work is supported by the 973 project (2012CB956000) of China, by NSFC Grants 40888001 and 41176019, by CAS Grant KZCX2-YW-JS204, and by Qingdao Municipal Grant 10-3-3-38jh. Z. Wang is supported by NSFC Grant 41206019 and by an open grant of the State Key Laboratory of Tropical Oceanography of SCSIO/CAS, and open grant of LASG of IAP/CAS. Discussions with Henk A. Dijkstra and with William K. Dewar are helpful for the improvement of the manuscripts.
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