HR: 13:40h
AN: A22E-01 INVITED     [PDF]
TI: Results of ACE 1, ACE 2, AEROSOLS99, INDOEX, TARFOX, and NEAQS: What Have We Learned? Where Do We Go From Here?
AU: * Quinn, P K
EM: patricia.k.quinn@noaa.gov
AF: NOAA PMEL, 7600 Sand Point Way NE, Seattle, WA 98115
AU: Bates, T S
EM: tim.bates@noaa.gov
AF: NOAA PMEL, 7600 Sand Point Way NE, Seattle, WA 98115
AB: Since 1995, a series of international field experiments has focused on the measurement of aerosol properties in marine regions downwind of continental emissions. A goal of these experiments has been the characterization of regional aerosol properties and their controlling processes in order to improve estimates of aerosol direct and indirect radiative forcing. The first Aerosol Characterization Experiment (ACE 1) purposefully steered clear of any continental plumes in order to characterize the "background" aerosol upon which anthropogenic perturbations could be imposed. ACE 2 focused on the European plume, INDOEX (Indian Ocean Experiment) on the plume emanating from the Indian subcontinent, ACE Asia on the Asian plume, and TARFOX (Tropospheric Aerosol Radiative Forcing Observational Experiment) and NEAQS (New England Air Quality Study) on the eastern U.S. plume. In addition, measurements of dust and biomass burning aerosols from Africa were made the Atlantic Aerosols99 cruise. With the exception of TARFOX, all experiments included the shipboard sampling of aerosol chemical, physical, and optical properties. The shipboard sampling was done with standardized protocols to minimize sampling biases and to make the data from the different regions directly comparable. Regional aerosol properties from the North American, European, African, Asian, and Indian plumes will be compared and the major findings from these experiments will be presented. Properties that will be compared include the relative contribution of the dominant chemical components to aerosol mass and light extinction, the absolute concentrations of the chemical components, light scattering and absorption by the aerosol, single scattering albedo, and aerosol optical depth. Since TARFOX was an aircraft study we include only data collected at altitudes less than 300 m. In addition to using standardized sampling protocols on the ship, over-determined data sets were collected so that a measured aerosol property such as aerosol mass or light extinction could be compared to mass or extinction calculated from an independent set of measurements. Hence, internal consistency in the data sets could be checked, sources of uncertainty could be identified and quantified in the measurement and model methods, and our understanding of regional aerosol properties could be objectively assessed. Based on these closure studies, successes of the experiments will be discussed as well as some of the areas where improvements are needed in measurement and modeling capabilities.
UR: http://saga.pmel.noaa.gov
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0365 Troposphere--composition and chemistry
DE: 0368 Troposphere--constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting