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Long-term simulations of NO 2 , O 3 , and NO 3 - in East Asia

Long-term simulations of NO 2 , O 3 , and NO 3 - in East Asia. Junling An ADORC, Japan. RAQM model. Updated /modified Advection scheme: modif. & simplif. to the Bott (1992) approach Dry dep.: modified Wesely’s scheme (Walmsley & Wesely, 1996)

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Long-term simulations of NO 2 , O 3 , and NO 3 - in East Asia

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  1. Long-term simulations of NO2, O3, and NO3- in East Asia Junling An ADORC, Japan

  2. RAQM model • Updated /modified • Advection scheme: modif. & simplif. to the Bott (1992) approach • Dry dep.: modified Wesely’s scheme (Walmsley & Wesely, 1996) • Gas Chemistry: condensed CBIV (He & Huang, 1992; An et al., 1999ab)

  3. Application of the RAQM model • Sulfur transport in East Asia (Huang et al., 1995) • Strong Kosa events during springs (Huang et al.,1998; Wang et al.,2000a) • Neutralization of acid rain by Kosa (Ueda et al.,2000) • High-ozone events occurred in northern Taiwan (Wang et al.,2000b) • Regional air quality over the Mainland of China (An et al.,2001)

  4. Model domain & monitor. sites 5 -- China 10 -- Japan 2 -- South Korea 2 -- Malasia 2 -- Mongolia 1 -- Philippines 1 -- Russia 3 -- Thailand 2 -- Vietnam

  5. Input data • Meteor. Fields: 4 times per day from NCEP • Precipitation: GPCC (Global Precipitation Climatology Center) • Emissions: SO2, NOx, NH3, & VOC (Klimont et al., 2001) • Land use: DeFries & Townshend (1994) • Topography: Data Center of IAP

  6. Precipitation in July of 1999

  7. Precipitation in Dec. of 1999

  8. Emissions of NO2 (Gg grid-1 a-1)

  9. Emissions of VOC (Gg grid-1 a-1)

  10. Topography (m)

  11. Land use

  12. Comparison: Happo - 9 & Oki - 10 in July Sob10

  13. Comparison: Happo - 9 & Oki - 10 in July Sob10

  14. Comparison: NO3- in July

  15. Comparison: NO3- in December

  16. NO3- distributions in July

  17. NO3- distributions in December

  18. Conclusions • Well simulated in July & December: NO2 & O3 (daily); NO3- (monthly) • Liquid chemistry: may not substantially influence NO3- conc. on a regional scale and long-term simulations • Natural emissions: significant for some sites with more forests

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