Context of aerosol chemistry over the Southeast United States

Wednesday, 17 December 2014: 8:00 AM
Daniel M Murphy, Earth System Research Laboratory, CSD, Boulder, CO, United States
Aerosols over the Southeast United States consist mostly of organics and sulfate with important contributions from nitrate, dust, and elemental carbon. Ground-based networks such as IMPROVE show seasonal patterns and trends in these species. A summer maximum caused by sulfate has decreased in recent years. Black carbon has declined but the decrease in sulfate has had a larger radiative effect. Satellite data such as MISR augment show the spatial pattern of this summer decrease. The large trend in sulfate but not ammonium has led to a dramatic change in aerosol neutralization. This has consequences for the formation of nitrates and organosulfates.