NASA's Aquarius Makes First Ocean Salt Measurements

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 & Space Research, Seattle. "Scientists from around the world are ready and waiting to study this important new satellite measurement for ocean and climate research."
 
The Aquarius/SAC-D (Satélite de Aplicaciones Científicas) observatory, a collaboration between NASA and Argentina's space agency, Comisión Nacional de Actividades Espaciales (CONAE), launched from California's Vandenberg Air Force Base on June 10 aboard a United Launch Alliance Delta II rocket and was placed in its proper initial orbit. Ground controllers at the SAC-D Mission Operations Center in Teófilo Tabanera Space Center in Cordoba, Argentina, then began a complete in-orbit checkout of all SAC-D spacecraft systems.
 
With all observatory systems confirmed to be healthy, SAC-D spacecraft commissioning activities were completed on July 24. The spacecraft's propulsion system then underwent a series of tests, and preliminary orbit adjustments were performed in preparation for turning on the observatory's eight science instruments.
 
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.
 
On Aug. 14, the Aquarius Instrument Flight Operations Team, together with the SAC-D Mission Flight Operations Team, began powering up the Aquarius instrument, and successfully completed deployment of the Aquarius antenna on Aug. 17. The team then began sequentially powering on the instrument's subsystems. On Aug. 20, the Aquarius radiometer, which collects the brightness temperature data from which salinity measurements are derived, was powered on for the first time in space and transmitted its first science data back to Earth, which were analyzed and found to be as expected. On Aug. 21, the team began powering on Aquarius' radar scatterometer, which corrects for the effects of ocean roughness on the radiometer readings. Commissioning of Aquarius was completed and regular data collection began on Aug. 24.
 
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.

 

Download Center

  • Monitoring and Reporting on Air Emissions for Regulators and the Real World

    When it comes to managing compliance and regulatory issues surrounding air emissions, there are no easy jobs. With interviews from practitioners from American Electric Power, Red Cedar Gathering, Trinity Consultants, and Cority, this eBook provides practical advice to advance your air emissions monitoring and reporting programs.

  • What Every EHS Professional Should Know About ESG

    Join experts from Arcadis and Cority on April 27th to learn the most common ESG reporting frameworks and how technology can help you improve reporting efficiency, identify areas for improvement, and create defensible audit trails.

  • Green Quadrant EHS Software 2021

    Read the new report by independent analyst firm, Verdantix, to get an unbiased comparison of the 22 most prominent EHS software vendors in the industry.

  • RFP Template for Waste Management Software

    Learn the essential questions to ask when evaluating waste management software solutions with this free, ready-to-use RFP template

  • 5 Keys to Best-in-Class Chemical Management

    Running a safe chemical program is challenging and complex: from knowing what's on-site to proper handling and disposal - all while navigating regulatory changes. Learn the best ways to mitigate chemical risk, get the most value out of your data, and gain buy-in for a chemical management solution.

Featured Webinar