Stratospheric monitoring

Once stratospheric observational systems are deployed in preparation for SAI operations, the data they generate must be continuously analyzed and interpreted to understand what is happening in the stratosphere and whether it matches predictions. Monitoring involves tracking key metrics such as aerosol optical depth, particle size distribution, and spatiotemporal variability to assess whether aerosols are behaving as models forecast. It also includes assessing the broader stratospheric response, including stratospheric temperature, water vapor, ozone, and chemical species that affect ozone depletion. This real-time analysis is essential for detecting deviations from expected behavior early enough to adjust deployment strategy if necessary.

Without sustained effort to analyze incoming observational data and communicate findings, even the most sophisticated measurement systems become disconnected from decision-making. Continuous monitoring and interpretation of stratospheric effects ensures that observed data informs adaptive management of SAI deployment throughout its operational lifetime.

This activity involves regular analysis and interpretation of stratospheric aerosol observations collected during and after SAI deployment. The work includes evaluating variability and trends in aerosol optical depth (AOD) and related stratospheric properties, comparing observations to model predictions, and assessing whether the stratospheric response is consistent with deployment assumptions. This is a continuous research effort requiring a team of scientists to regularly analyze incoming observational data, conduct quality control, perform statistical trend analysis, and synthesize findings into actionable information for decision makers.

The scope focuses on analysis and interpretation of data rather than instrument development or maintenance. Like the parallel climate impacts monitoring activity, this is an ongoing effort with no fixed end date, extending throughout deployment and beyond, requiring sustained analytical capacity. Critically, a minimum of 3 years of baseline stratospheric observations must be collected before an aerosol evolution and transport experiment.