PNNL

Abstract

The Geoengineering Model Intercomparison Project (GeoMIP) was designed to determine robust climate system responses to solar geoengineering. GeoMIP currently consists of four standardized computer experiments involving insolation reduction or stratospheric sulfate aerosols, and three more experiments involving marinecloud brightening are planned. This project has improved confidence in the expected climate effects of geoengineering in several key areas, such as the effects of geoengineering on spatial patterns of temperature and the spatial distribution of extreme precipitation events. However, GeoMIP has also highlighted several important research gaps, such as the expected effects on terrestrial net primary productivity and the importance of the CO2 physiological effect in determining hydrologic cycle response to geoengineering. Future efforts will endeavor to address these gaps, as well as encourage cooperation with the chemistry modeling communities, the impact assessment communities, and other groups interested in model output.