The spatial distdbution and deposition of PM2.5 in coastal areas of eastern China in 2010 were simulated using the CMAQ model. The results show that the simulated data were consistent with the observed data, and the m...The spatial distdbution and deposition of PM2.5 in coastal areas of eastern China in 2010 were simulated using the CMAQ model. The results show that the simulated data were consistent with the observed data, and the model could simulate the regional distribution of PM2.5 concentration. There were obvious seasonal variations in PM2.5 concentration in eastern China, and the spatial distribution of PM2.5 concentration which increased from the edge to the center of a city coincided well with that of the sources. In North China, the high-value center of PM2.5 concentration reached above 120 μg/m3. Wet deposition was the main way to remove PM2.5 , and wet deposition flux of PM2.5 was at least five times more than that of the dry deposition flux. Deposition flux of PM2.5 was the largest in summer, while it was the smallest in winter. The high-value center of deposition flux of PM2.5 in eastern China exceeded 30 mg/（ m2 · d）. Wet deposition of PM2s in each province or region accounted for more than 91% of total deposition of PM2.5. Total deposition of PM2.5 in all simulated regions amounted to 4.67 ×10^6 /a, and total deposition of PM2.5 in Beijing, Tianjin and Hebei was up to 1.65 ×10^6 t/a.展开更多
Based on the monitored data of references, EANET and the CMAQ （4.7.1） model scenado simulations, the annual average concentration of SO2 in China in the recent 10 years and the contribution of China＇s SO2 emissions...Based on the monitored data of references, EANET and the CMAQ （4.7.1） model scenado simulations, the annual average concentration of SO2 in China in the recent 10 years and the contribution of China＇s SO2 emissions to SO2 concentration and sulfur deposition at various sites in Japan downwind were analyzed. The results showed that from 2001 to 2009 annual average concentration of SO2 was 0 -150 μg/m^3 and showed a decreasing trend on the whole in China. The correlation coefficient of annual average concentration of SO2 at different sites in Japan and China＇s SO2 emissions was lower than that of annual average concentration and emission of SO2 in China＇s cities on the whole, showing that SO2 discharged in China had small impact on SO2 concentration in Japan. The contribution rate of China＇s SO2 emissions to annual average concentration of SO2 at various sites in Japan in 2010 was 7.5% -44.0%, averaging 22.6% ; the annual average volume concentration of SO2 at different sites in Japan caused by China＇s SO2 emissions was 0 -0.5 × 10^-9. The contribution rate of China＇s SO2 emissions to sulfur deposition at various sites in Japan in 2010 varied from 8.0% to 41.0%, averaging 22.1%.展开更多
基金Supported by the National Natural Science Foundation of China(41373131)National Key Technology R&D Program(2014BA C23B03)
文摘The spatial distdbution and deposition of PM2.5 in coastal areas of eastern China in 2010 were simulated using the CMAQ model. The results show that the simulated data were consistent with the observed data, and the model could simulate the regional distribution of PM2.5 concentration. There were obvious seasonal variations in PM2.5 concentration in eastern China, and the spatial distribution of PM2.5 concentration which increased from the edge to the center of a city coincided well with that of the sources. In North China, the high-value center of PM2.5 concentration reached above 120 μg/m3. Wet deposition was the main way to remove PM2.5 , and wet deposition flux of PM2.5 was at least five times more than that of the dry deposition flux. Deposition flux of PM2.5 was the largest in summer, while it was the smallest in winter. The high-value center of deposition flux of PM2.5 in eastern China exceeded 30 mg/（ m2 · d）. Wet deposition of PM2s in each province or region accounted for more than 91% of total deposition of PM2.5. Total deposition of PM2.5 in all simulated regions amounted to 4.67 ×10^6 /a, and total deposition of PM2.5 in Beijing, Tianjin and Hebei was up to 1.65 ×10^6 t/a.
基金Supported by the National Natural Science Foundation of China(41373131)National Key Technology R&D Program(2014BAC23B03)Major Tender Project of Social Science Foundation of Human Province,China(14DA12)
文摘Based on the monitored data of references, EANET and the CMAQ （4.7.1） model scenado simulations, the annual average concentration of SO2 in China in the recent 10 years and the contribution of China＇s SO2 emissions to SO2 concentration and sulfur deposition at various sites in Japan downwind were analyzed. The results showed that from 2001 to 2009 annual average concentration of SO2 was 0 -150 μg/m^3 and showed a decreasing trend on the whole in China. The correlation coefficient of annual average concentration of SO2 at different sites in Japan and China＇s SO2 emissions was lower than that of annual average concentration and emission of SO2 in China＇s cities on the whole, showing that SO2 discharged in China had small impact on SO2 concentration in Japan. The contribution rate of China＇s SO2 emissions to annual average concentration of SO2 at various sites in Japan in 2010 was 7.5% -44.0%, averaging 22.6% ; the annual average volume concentration of SO2 at different sites in Japan caused by China＇s SO2 emissions was 0 -0.5 × 10^-9. The contribution rate of China＇s SO2 emissions to sulfur deposition at various sites in Japan in 2010 varied from 8.0% to 41.0%, averaging 22.1%.
