基金The National Basic Research Program of China （973 Program） under contract No.2012CB417305,China Ocean Mineral Resources R ＆ D Association ＂Twelfth Five-Year＂ Major Program under contract Nos DY125-11-R-01 and DY125-11-R-05,the Natural Science Foundation of Zhejiang Province under contract No. LY12D06006,the scientific research fund of the Second Institute of Oceanography under contract No. JG1203 We would like to thank the science party of the third leg of the Chinese DY115-21 cruise and the crew ofR/V Dayanglfor their hard work during the East Pacific Ocean expedition. We also thank Zhu Jian of Woods Hole Oceanographic Institution and Wang Tingting of Tongji University, for their assistance. We are grateful to Ed. Baker of the National Oceanic and Atmospheric Administration Pacific Ocean Environment Laboratory,who provided the MAPRs for the survey, and Wang Yuan of the Second Institute of Oceanography for providing the current data.