Suburban spaceman

Artist's concept of the Aquarius/SAC-D spacecraft, a collaboration between NASA and Argentina's space agency, with participation from Brazil, Canada, France and Italy. 

Aquarius, the NASA-built primary instrument on the spacecraft, will take NASA's first space-based measurements of ocean surface salinity, a key missing variable in satellite observations of Earth that links ocean circulation, the global balance of freshwater and climate.

Image credit: NASA

NASA's Aquarius instrument has successfully completed its commissioning phase and is now "tasting" the saltiness of Earth's ocean surface, making measurements from its perch in near-polar orbit.

"This marks the end of the long odyssey to design, build and launch this mission, and the start of a new journey of scientific exploration," said Aquarius Principal Investigator Gary Lagerloef of Earth and Space Research, Seattle.

"Scientists from around the world are ready and waiting to study this important new satellite measurement for ocean and climate research."


Aquarius will make NASA's first space observations of the salinity, or concentration of salt, at the ocean surface, a key variable in satellite studies of Earth.

Variations in salinity influence the ocean's deep circulation, outline the path freshwater takes around our planet and help drive Earth's climate.

The Aquarius science team will spend the coming months analyzing and calibrating the measurements and releasing preliminary data.

With the Aquarius instrument commissioning now complete, the SAC-D Instruments Flight Operations Teams, together with the SAC-D Mission Flight Operations Team in Argentina, are now engaged in commissioning the other seven SAC-D instruments.

Once all the observatory instruments are commissioned, a maneuver will be conducted to place Aquarius/SAC-D in its final orbit, 408 miles (657 kilometers) above Earth.