From April–June 2015, scientists on the NOAA ship Ronald H. Brown are collecting observations of Pacific Ocean water properties and currents from Tahiti to Alaska. This expedition is part of the US GO-SHIP Repeat Hydrography Program, an international effort to measure and observe the changing global ocean every decade. This particular cruise fortuitously crossed the equator during a developing El Niño and shortly after a transition to the warm phase of the Pacific Decadal Oscillation, allowing study of how these climate variations affect ocean conditions such as biological production and heat transport.
Read more about the US GO-SHIP program, leg 1 and leg 2 cruise blogs, the PMEL Carbon Program Repeat Hydrography page, the Large-Scale Ocean Physics page, and the Ocean Tracer group.