HR: 16:00h
AN: A34A-01 INVITED     [Abstracts]
TI: Modeling Study of Seasonal And Interannual Variation of Trans-Boundary Air Pollution In East Asia
AU: * UNO, I
EM: iuno@riam.kyushu-u.ac.jp
AF: Itsushi UNO, Kyushu University, Kasuga, 816-8580 Japan
AB: The transport and transformation of air pollutants and aerosols over East Asia for years between 1998 and 2004 was simulated using CMAQ version 4.4 driven by meteorological fields obtained from the Regional Atmospheric Modeling System (RAMS). The horizontal model domain for the CMAQ simulation is 6240 _~ 5440 km2 centered at (25N, 115E) with 80 km grid resolution. The anthropogenic emissions were obtained from an emission inventory with a 0.5 deg resolution developed by FRCGC (Frontier Research Center for Global Change) for the year 2000 base case. Based on this long-term simulation, we analyzed the observation data to get the typical seasonal and inter-annual variation of pollutant. At first, the 3-hour averaged time variation of simulated and observed O3 concentrations at each monitoring site were intensively compared and showed that CMAQ multi-year application retrieves the observed major seasonal variation. Secondly, we showed the latitudinal concentration gradients (from 25N ? 45N along the Japan islands) and its seasonal variation. We also tried to analyze the typical outflow flux of trans-boundary pollutants. Thirdly, we showed the inter-annual variation of pollutants level based on the 7 years observation and simulation. One of the important points was the magnitude of inter-annual variations of O3 with fixed emission intensity (year 2000 base) showed the large variation and its range of variation was almost comparable with that of observation. This fact indicates the inter-annual variation of regional meteorology/climate plays an important role to understanding the inter-annual increase of concentration level.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0368 Troposphere: constituent transport and chemistry
DE: 0550 Model verification and validation
DE: 3355 Regional modeling
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005