Table 2a. Mobile Platforms Involved in the ICARTT Study Program, Agency Emphasis Aircraft Douglas DC8 INTEX NA, NASA regional distribution of chemically active compounds over North America and their sources (emphasis on free troposphere); outflow from North America Lockheed WP-3D NEAQS/ITCT, NOAA emissions and chemical processing downwind from urban areas and industrial point sources in the northeastern United States (emphasis on boundary layer); outflow from North America Grumman Gulfstream I DOE emissions and chemical processing downwind from urban areas and industrial point sources (emphasis on boundary layer) Douglas DC-3 NEAQS/ITCT, NOAA emissions and chemical processing downwind from urban areas and industrial point sources (emphasis on boundary layer) FAAM BAE 146-301 ITOP, NERC observations of chemical processing occurring in air masses transported from North America to Europe Dassault Falcon ITOP, DLR measurements in pollution plumes transported from North America including forest fire plumes originating from Canada and Alaska and quasi Lagrangian studies; measurements of emissions from shipping in the English Channel; satellite validation and measurement comparisons BAe Jet Stream J-31 INTEX NA, NASA aerosol, water vapor, cloud, and ocean surface radiative properties and effects; satellite validation; regional-scale understanding of anthropogenic aerosol and radiative impacts Twin Otter CIRPAS, NSF the relationship between cloud properties and the properties of the aerosols that are influencing the cloud formation Convair 580 MSC the relationship between cloud properties and the properties of the aerosols that are influencing the cloud formation Ship Ronald H. Brown NEAQS/ITCT, NOAA chemical composition and aerosol physical and optical properties in the marine boundary layer; emission from ships; long-path radiation-aerosol measurements