Test flights for the Stratospheric Aerosol processes, Budget and Radiative Effects (SABRE) mission started this week in Houston, TX.  The SABRE mission will study the chemistry and composition of the upper troposphere and lower stratosphere up to altitudes of 60,000 ft. The instrumentation on-board will capture real-time measurements of trace gases such as ozone and chlorine compounds, as well as the composition, microphysics, and radiative properties of aerosols. SABRE measurements will ultimately enable more accurate quantification of the direct and indirect climate impacts from variations in stratospheric aerosols and gases in the present-day atmosphere and provide a foundation for estimating changes in aerosol radiative forcing under future climate scenarios.