人为源和生物源排放对臭氧的贡献 ——以春夏季东亚地区为例

利用因子分离法区分NOx与人为、生物源VOCs(AVOCs、BVOCs)分别对东亚地区近地面O3浓度的纯贡献与协同贡献,基于区域空气质量模式(RAQM)讨论了2000年春、夏季排放源的总贡献以及协同贡献的空间分布.结果表明,光化学反应在日最大O3浓度的形成中占很大比例,我国北方大部分地区源的贡献夏季最大,南方受东亚季风影响,夏季最小.AVOCs与NOx、BVOCs与NOx的协同效应加强了光化学反应中O3的形成.AVOCs与NOx的协同贡献季节性变化特征显著,我国南方大部分地区夏季最小.BVOCs与NOx的协同贡献在我国南北方差异很大,春季高值区主要分布在南方大部分地区,北方峰值出现在夏季.说明臭氧调控对策的制定除源排放大小外还须考虑地域差异和季节变化.

Total and synergistic impacts of anthropogenic and biogenic emissions on ozone-examples in East Asia in spring and summer

The factor separation technique was used as a tool to quantify the pure and synergistic contributions from emissions of anthropogenic nitrogen oxides (NOx), anthropogenic and biogenic volatile organic compounds (AVOCs, BVOCs) to the surface ozone concentrations of 2000 based on the regional air quality model (RAQM). photochemistry played an important role in the formation of daily maximum ozone. The emission impacts show significantly seasonal and regional difference. In most areas of Northern China, the largest contribution occurred in summer, while in the south of China (below 30°N) it was influenced by the Asian monsoon system and was smallest in summer. The interaction between AVOCs and NOx, BVOCs and NOx enhanced ozone concentrations. The synergistic contribution between AVOCs and NOx displayed a distinct seasonal cycle and had a summer minimum in most areas of Southern China. The interaction between BVOCs and NOx showed much difference in north and south China. In spring the higher value appeared in the south, while the interaction had a summer maximum in the north. This suggests that difference in locations and seasons should be considered besides emissions of NOx and VOCs in O3 reductions.