Atmospheric aerosols impact the Earth energy balance directly by scattering solar radiation back to space and indirectly by changing the albedo, frequency, and lifetime of clouds. Carbon soot (or black carbon) produced from incomplete combustion of fossil fuels and biomass burning represents a major component of primary aerosols. Because of high absorption cross-sections over a broad range of the electromagnetic spectra, black carbon contributes significantly to climate change by direct radiative forcing and is the second most important component causing global warming after carbon dioxide. In this talk, results will be presented on measurements of aerosol properties during the 2009 SHARP/SOOT Campaign. An innovative arrangement of equipment was deployed to provide a comprehensive analysis of ambient particle properties, including tandem differential mobility analyzer and aerosol particle mass analyzer (TDMA-APM) and a Condensation Particle Counter (CPC) to determine the particle size, mass, surface area, volume, and effective density of the ambient particles. Concurrently, using a cavity ring-down spectrometer and nephelometer, our team measured the light extinction, scattering, absorption, and other optical properties. Focus will be given on the measurements of black carbon concentrations, with the expectation of obtaining a greater understanding of their aging process in the atmosphere.