AEROCOM (Aerosol Comparisons between Observations and Models) is an open international initiative of scientists interested in the advancement of the understanding of the global aerosol and its impact on climate. AEROCOM aims to document and understand the differences between global aerosol models. It has produced several influential papers describing model intercomparisons and evaluations against observations.
AEROS (Aerosol Model Robustness and Sensitivity Analysis) was the forerunner of GASSP, funded by NERC from 2010-2013. AEROS developed techniques of model emulation and sensitivity analysis to quantify aerosol model uncertainty.
ACTRIS (Aerosols, Clouds, and Trace gases Research InfraStructure Network) is a European Project aiming at integrating European ground-based stations equipped with advanced atmospheric probing instrumentation for aerosols, clouds, and short-lived gas-phase species.
MACC-II (Monitoring Atmospheric Composition and Climate) provides data records on atmospheric composition for recent years, data for monitoring present conditions and forecasts of the distribution of key constituents for a few days ahead. MACC-II combines state-of-the-art atmospheric modelling with Earth observation data to provide information services covering European air quality, global atmospheric composition, climate forcing, the ozone layer and UV and solar energy, and emissions and surface fluxes.
IAGOS (In-service Aircraft for a Global Observing System) aims at establishing a sustainable distributed research infrastructure for the global observation of atmospheric composition. It is setting up a network of commercial aircraft that will carry out observations on a scale and in numbers that would be impossible to achieve using research aircraft and for which other measurement methods (e.g. satellites) have technical limitations.