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A trans-Pacific section along latitude 24.5°N is planned for 1985, with the field program tentatively scheduled for April 17 to June 27. The purpose of the expedition is to measure the transport of heat by ocean currents, to determine the net transport of water masses and estimate the meridional general circulation of the North Pacific, and to improve the mapping of tracer distributions in the deep North Pacific.

Approximately 200 surface-to-bottom CTD/rosette stations will be occupied across the width of the ocean, with maximum station spacing of 80 km over abyssal plains, closing to 30–50 km over rough topography and boundaries. Water samples will be collected and analyzed on board for salinity, oxygen, and nutrients.