Please Click Here GNSS RO Draft Requirements.

Please Click Here for RFI and Initial Mission Concept information.

The Climate Absolute Radiance and Refractivity Observatory (CLARREO) mission is being developed by NASA and partner organizations to monitor the pulse of the atmosphere to better understand climate change. CLARREO was identified as a mission of national importance in the National Research Council’s (NRC) report, entitled, “Earth Science and Applications from Space: National Imperatives for the Next Decade and Beyond” . This report, known widely as the Decadal Survey, addresses key scientific questions and societal objectives on which to focus Earth and environmental observations for the future.

CLARREO is a climate-focused mission that will become a key element of the climate observing system. The foundation for CLARREO is the ability to produce irrefutable climate records through the use of exacting onboard traceability of the instrument accuracy. Spectral reflected solar and emitted infrared radiances and Global Positioning System (GPS) Radio Occultation refractivities measured by CLARREO will be used to detect climate trends and to test, validate, and improve climate prediction models. The CLARREO mission will provide accurate, credible, and tested climate records that lay the groundwork for informed decisions on mitigation and adaptation policies that address the effects of climate change on society.