东亚边界层臭氧时空分布的数值模拟研究

利用嵌套网格空气质量预报模式系统(NAQPMS)对2010年东亚地区边界层臭氧(O3)的时空分布进行了数值模拟,并评估了东亚边界层光化学反应的活性.结果表明,NAQPMS模式与观测结果较为一致,站点观测与模拟的日均值(月均值)相关系数达到0.56~0.91,模式能合理再现东亚地区地面O3的时空分布特征.东亚地区冬季边界层O3低值区出现在中国东部;春季O3浓度增加,西北太平洋沿岸地区O3浓度达60μL/m3左右;夏季东亚中纬度35°N附近大陆地区O3由于强烈的光化学反应呈现出一浓度高值带,浓度达60μL/m3以上;秋季东亚大部分地区O3浓度维持在40~45μL/m3左右.夏季中国京津冀和长江三角洲部分地区光化学净生成率已超过30×10-9/d.

Modeling analysis of boundary layer ozone distributions over East Asia

The nested air quality prediction model system (NAQPMS) was applied to investigate the temporal and spatial variations of boundary layer ozone over China in 2010, and the photochemical activity in the boundary layer was assessed. The model performed well with the observed daily (monthly) mixing ratio of ozone, and the correlation coefficients ranging from 0.56 to 0.91. Boundary O3 distribution over East Asia showed a significant seasonal variability with the meteorological and photochemical condition. In winter, the seasonal averaged O3 concentrations over East Asia were among 20~50μL/m3with low O3 concentrations cover the East China. The major outflow transport pathway for O3 to the western Pacific in spring was at 25~40°N, where the ozone mixing ratios in the lower troposphere might reach up to 60μL/m3. In summer, high ozone (about 60μL/m3) appeared in the East China around 35°N, where pollutant emissions were strong and ozone net production was high. In autumn, the distribution of O3 was similar to that in spring, but O3 concentrations were around 40~45μL/m3 lower than those in spring. The net photochemical production of ozone in the North China and the Yangtze River Delta has exceeded 30×10-9/d in summertime.