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Studies of Emissions and Atmospheric Composition, Clouds and Climate Coupling by Regional Surveys(SEAC4RS)

1. To determine how pollutant emissions are redistributed via deep convection throughout the troposphere.
2. To determine the evolution of gases and aerosols in deep convective outflow and the implications for UT/LS chemistry.
3. To identify the influences and feedbacks of aerosol particles from anthropogenic pollution and biomass burning on meteorology and climate through changes in the atmospheric heat budget (i.e., semi-direct effect) or through microphysical changes in clouds (i.e., indirect effects).
4. To serve as a calibration/validation test bed for future satellite instruments and missions.
Attention will also be given to the influence of biomass burning and pollution, their temporal evolution, and ultimately impacts on meteorological processes which in turn feed back into regional air quality. With respect to meteorological feedbacks, the opportunity to examine the impact of polluting aerosols on cloud properties and ultimately dynamics will be of particular interest.
To accomplish the goals of SEAC4RS, two aircraft are required. The NASA DC-8 will provide observations from near the surface to 12 km, and the NASA ER-2 will provide high altitude observations reaching into the lower stratosphere as well as important remote sensing observations connecting satellites with observations from lower flying aircraft and surface sites.