HR: 1340h
AN: A33A-0868    [Abstracts]
TI: Summer aerosol particle mixing in different climate and source regions of the United Arab Emirates (UAE)
AU: * Semeniuk, T A
EM: Trudi.Semeniuk@asu.edu
AF: Department of Geological Sciences and Chemistry/Biochemistry, Arizona State University, Tempe, AZ 85281 United States
AU: Bruintjes, R T
A33A-0868 AF: National Center for Atmospheric Research, 3450 Mitchell Lane, Boulder, CO 80301 United States
AU: Salazar, V
A33A-0868 AF: National Center for Atmospheric Research, 3450 Mitchell Lane, Boulder, CO 80301 United States
AU: Breed, D W
A33A-0868 AF: National Center for Atmospheric Research, 3450 Mitchell Lane, Boulder, CO 80301 United States
AU: Jensen, T L
A33A-0868 AF: National Center for Atmospheric Research, 3450 Mitchell Lane, Boulder, CO 80301 United States
AU: Buseck, P R
A33A-0868 AF: Department of Geological Sciences and Chemistry/Biochemistry, Arizona State University, Tempe, AZ 85281 United States
AB: The high aerosol loadings over the UAE reflect local to regional natural and anthropogenic pollution sources. To understand the impact of the high levels of pollution on both local and global climate systems, aerosol characterization flights in summer 2002 were used to sample major source areas, and to provide information on the interaction of aerosol particles within different geographic regions of the UAE. Atmospheric information and aerosol samples were collected from the marine/oil-industry region, NW coastal industries and cities, Oman Mountain Range, and NE coastal region. Aerosol samples were collected with multi-stage impactors and were analysed later using transmission electron microscopy. All samples are dominated by mineral grains or mineral aggregates in the coarse-mode fraction, and ammonium sulfate droplets in the fine-mode fraction. Differences in the types of mineral grains (different regional desert sources), inorganic salt and soot fractions, and types of internally mixed particles occur between regions. Oil-related industry sites have an abundance of coated and internally mixed particles, including sulfate-coated mineral grains, and mineral aggregates with chloride and sulfate. Cities have slightly elevated soot fractions, and typically have metal oxides. The NE coastal area is characterized by high soot fractions (local shipping) and mixed volatile droplets (regional Asian pollution). Particle populations within the convection zone over the Oman Mountain Range comprise an external mixture of particles from NW and NE sources, with many deliquesced particles. Both land-sea breezes in the NW regions and convection systems in the mountains mix aerosol particles from different local and regional sources, resulting in the formation of abundant internally mixed particles. The interaction between desert dust and anthropogenic pollution, and in particular the formation of mineral aggregates with chloride and sulfate, enhances the coarse-mode fraction and droplet fraction in industrial and mountainous regions.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005