The following information is missing from the Funding section: State Oceanic Administration grant number 201105021 and China National Offshore Oil Corporation grants CNOOC-KJ 125 FZDXM 00 TJ 001--2014 and CNOOC-KJ 125 FZDXM 00 ZJ 001--2014.

The complete, correct Funding statement is: This work was supported by China MOST 973 grant 2013CB955700 (<http://www.973.gov.cn/English/Index.aspx>), NSFC grants 91028001, 91328209, and 91428308 (<http://www.nsfc.gov.cn/publish/portal1>), SOA grants 201105021 and GASI-03-01-02-05 (<http://www.soa.gov.cn/index.html>), and CNOOC grants CNOOC-KJ 125 FZDXM 00 TJ 001--2014 and CNOOC-KJ 125 FZDXM 00 ZJ 001--2014 (<http://www.cnooc.com.cn/>). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
