Appendix S1. The relevant hydrographic and biogeochemical datasets together with full descriptions of the analytical methods for measuring dissolved H2 and N2 fixation are in the Supporting Information.


Figure S1. 14-day composite of satellite derived SSHA 100 km north of the Hawaiian Islands in the Pacific Ocean between 7 and 21 September 2011 (data from Moderate Resolution Imaging Spectroradiometer). A summary of the cruise transect is indicated by the solid black line and the labeled white circles represent the sampling stations discussed in the text. Station ALOHA, the long-term sampling station for the Hawaii Ocean Time-series (HOT) programme, located at 22°45′N, 158°W is also highlighted.


Figure S2. Representative water column profiles for the two sections of the cruise track, (A-B) Stn 3 and (C-D) Stn 13.

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