Though based at Scripps's Nimitz Marine Facility in San Diego Harbor, both vessels were in Seattle because they had just finished a joint NASA-led field campaign dubbed EXPORTS (EXport Processes in the Ocean from Remote Sensing).
Sally Ride headed to sea to recover and deploy a series of moorings for the Ocean Observatories Initiative's Coastal Endurance Array off the Washington and Oregon coasts. The blue-and-yellow surface buoys stacked on the aft deck will suspend a variety of instruments in the water column and connect to the ocean-bottom network.
Roger Revelle sailed north to start a two-month U.S. GEOTRACES GP15 cruise to sample the marine biogeochemical cycles of trace elements and their isotopes from Alaska to Tahiti.
Follow Sally Ride on Twitter at twitter.com/RVSallyRide.
Follow Roger Revelle on Twitter at twitter.com/RVRogerRevelle.
Related Image Gallery: Photo of the Week 2018