Three-dimensional simulations of inorganic aerosol distributions in east Asia during spring 2001

Youhua Tang, Gregory R. Carmichael, John H. Seinfeld, Donald Dabdub, Rodney J. Weber, Barry Huebert, Antony D. Clarke, Sergio A. Guazzotti, David A. Sodeman, Kimberly A. Prather, Itsushi Uno, Jung Hun Woo, James J. Yienger, David G. Streets, Patricia K. Quinn, James E. Johnson, Chul Han Song, Vicki H. Grassian, Adrian Sandu, Robert W. TalbotJack E. Dibb

研究成果: Contribution to journalArticle査読

81 被引用数 (Scopus)


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 fractions.

ページ(範囲)D19S23 1-32
ジャーナルJournal of Geophysical Research D: Atmospheres
出版ステータス出版済み - 10 16 2004

All Science Journal Classification (ASJC) codes

  • 地球物理学
  • 海洋学
  • 林業
  • 水圏科学
  • 生態学
  • 水の科学と技術
  • 土壌科学
  • 地球化学および岩石学
  • 地表過程
  • 大気科学
  • 宇宙惑星科学
  • 地球惑星科学(その他)
  • 古生物学


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