SAGE III on ISS is the fourth generation of a series of NASA Earth-observing instruments, known as the Stratospheric Aerosol and Gas Experiment.
The first SAGE III instrument was launched on the Russian Meteor (satellite) spacecraft. The recently revised SAGE III will be mounted to the International Space Station
where it will use the unique vantage point of ISS to make long-term measurements of ozone, aerosols, water vapor, and other gases in Earth's atmosphere.
The SAGE III instrument is used to study ozone, a gas found in the upper atmosphere that acts as Earth’s sunscreen, and aerosols, or tiny particles in the atmosphere.
These measurements are vital inputs to the global scientific community for improved understanding of climate, climate change and human-induced ozone trends.
SAGE III will be mounted to the ISS at the ELC 4 platform, where it will operate alongside experiments from all over the world in the space-based laboratory. The
orbital path of ISS will help maximize the scientific value of SAGE III observations as it provides global, long-term measurements of key components of Earth′s
atmosphere.