long-term simulations of no 2 , o 3 , and no 3 - in east asia
DESCRIPTION
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) - PowerPoint PPT PresentationTRANSCRIPT
Long-term simulations of NO2, O3, and NO3
- 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 (W
almsley & Wesely, 1996)
– Gas Chemistry: condensed CBIV (He & Huang, 1992; An et al., 1999ab)
Application of the RAQM model
– Sulfur transport in East Asia (Huang et al., 1995)
– Strong Kosa events during springs (Huan
g et al.,1998; Wang et al.,2000a)
– Neutralization of acid rain by Kosa (Ueda et al.,2000)
– High-ozone events occurred in northern Taiwan (Wan
g et al.,2000b)
– Regional air quality over the Mainland of China (A
n et al.,2001)
Model domain & monitor. sites
5 -- China10 -- Japan 2 -- South Korea 2 -- Malasia 2 -- Mongolia 1 -- Philippines 1 -- Russia 3 -- Thailand 2 -- Vietnam
Input data
Meteor. Fields: 4 times per day from NCEP Precipitation: GPCC
(Global Precipitation Climatology Center) Emissions: SO2, NOx, NH3, & VOC (Klimo
nt et al., 2001) Land use: DeFries & Townshend (1994) Topography: Data Center of IAP
Precipitation in July of 1999
Precipitation in Dec. of 1999
Emissions of NO2 (Gg grid-1 a-1)
Emissions of VOC (Gg grid-1 a-1)
Topography (m)
Land use
Comparison: Happo - 9 & Oki - 10 in July
00. 5
11. 5
22. 5
33. 5
44. 5
51 4 7 10 13 16 19 22 25 28 31
Days
NO2
(ppb
) Sob09Sob 1 0Sca09Sca10
Sob10
Comparison: Happo - 9 & Oki - 10 in July
0
10
20
30
40
50
60
70
801 4 7 10 13 16 19 22 25 28 31
Days
O 3 (
ppb) Sob09
Sob 1 0Sca09Sca10
Sob10
Comparison: NO3- in July
0
5
10
15
20
25
30
35
40NO
3-
(10-6
mol
/l)
1 5 7 9 11 14 16 18 22 25
Moni tori ng si tes of EANET
Obs.Si m.
Comparison: NO3- in December
0
20
40
60
80
100
120NO
3-
(10-6
mol
/l)
6 7 8 9 10 13 14 15 19 27 28
Moni tori ng si tes of EANET
Obs.Si m.
NO3- distributions in July
NO3- distributions in December
Conclusions
Well simulated in July & December: NO
2 & 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