Journal article
Three‐dimensional simulations of inorganic aerosol distributions in east Asia during spring 2001
Journal of Geophysical Research: Atmospheres, Vol.109(D19), pp.D19S23-n/a
10/16/2004
DOI: 10.1029/2003JD004201
Abstract
In this paper, aerosol composition and size distributions in east Asia are simulated using a comprehensive chemical transport model. Three‐dimensional aerosol simulations for the TRACE‐P and ACE‐Asia periods are performed and used to help interpret actual observations. The regional chemical transport model, STEM‐2K3, which includes the on‐line gas‐aerosol thermodynamic module SCAPE II, and explicitly considers chemical aging of dust, is used in the analysis. The model is found to represent many of the important observed features. The Asian outflow during March and April of 2001 is heavily polluted with high aerosol loadings. Under conditions of low dust loading, SO2 condensation and gas phase ammonia distribution determine the nitrate size and gas‐aerosol distributions along air mass trajectories, a situation that is analyzed in detail for two TRACE‐P flights. Dust is predicted to alter the partitioning of the semivolatile components between the gas and aerosol phases as well as the size distributions of the secondary aerosol constituents. Calcium in the dust affects the gas‐aerosol equilibrium by shifting the equilibrium balance to an anion‐limited status, which benefits the uptake of sulfate and nitrate, but reduces the amount of aerosol ammonium. Surface reactions on dust provide an additional mechanism to produce aerosol nitrate and sulfate. The size distribution of dust is shown to be a critical factor in determining the size distribution of secondary aerosols. As much of the dust mass is found in the supermicron mode (70–90%), appreciable amounts of sulfate and nitrate are found in the supermicron particles. For sulfate the observations and the analysis indicate that 10–30% of sulfate is in the supermicron fraction during dust events; in the case of nitrate, more than 80% is found in the supermicron fraction.
Details
- Title: Subtitle
- Three‐dimensional simulations of inorganic aerosol distributions in east Asia during spring 2001
- Creators
- Youhua Tang - University of IowaGregory R Carmichael - University of IowaJohn H Seinfeld - California Institute of TechnologyDonald Dabdub - University of CaliforniaRodney J Weber - Georgia Institute of TechnologyBarry Huebert - University of HawaiiAntony D Clarke - University of HawaiiSergio A Guazzotti - University of CaliforniaDavid A Sodeman - University of CaliforniaKimberly A Prather - University of CaliforniaItsushi Uno - Kyushu UniversityJung‐Hun Woo - University of IowaJames J Yienger - University of IowaDavid G Streets - Argonne National LaboratoryPatricia K Quinn - NOAAJames E Johnson - NOAAChul‐Han Song - Gwangju Institute of Science and Technology (GIST)Vicki H Grassian - University of IowaAdrian Sandu - Virginia Polytechnic Institute and State UniversityRobert W Talbot - University of New HampshireJack E Dibb - University of New Hampshire
- Resource Type
- Journal article
- Publication Details
- Journal of Geophysical Research: Atmospheres, Vol.109(D19), pp.D19S23-n/a
- DOI
- 10.1029/2003JD004201
- ISSN
- 0148-0227
- eISSN
- 2156-2202
- Number of pages
- 32
- Language
- English
- Date published
- 10/16/2004
- Academic Unit
- Civil and Environmental Engineering; Occupational and Environmental Health; Nursing; Chemistry; Chemical and Biochemical Engineering
- Record Identifier
- 9984003437402771
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