EUCAARI was a EU 6th Framework Programme Integrated Project on aerosol, cloud, climate and air quality interactions
Atmospheric aerosols affect global radiation, cloud formation, and human health. Trace gases and atmospheric aerosols are tightly connected with each other via physical, chemical, meteorological and biological processes occurring in the atmosphere and at the atmosphere-biosphere interface. Human actions, such as emission policy, forest management and land use changes, as well as various natural feedback mechanisms involving the biosphere and atmosphere, have substantial impacts on the complicated couplings between atmospheric aerosols, trace gases, air quality and climate .
Atmospheric aerosol particles affect the quality of our life in many different ways. They influence the Earth's radiation balance directly by scattering and absorbing solar radiation, and indirectly by acting as cloud condensation nuclei (CCN). Aerosol particles deteriorate both human health and visibility in urban areas. Aerosol particles modify the intensity and distribution of radiation that reaches the earth surface, having direct influences on the terrestrial carbon sink. Better understanding and quantifying of the above aerosol effects in the atmosphere requires detailed information on how different sources (including those related to the biosphere) and atmospheric transformation processes modify the properties of atmospheric particles and the concentrations of trace gases, including complex feedbacks between atmosphere, oceans and biosphere