北京地区对流层低层臭氧及硫酸盐气溶胶的时空分布

基于OMI/Aura卫星资料，分析了北京地区2007~2016年近10a对流层O₃浓度（0~3km）、硫酸盐气溶胶光学厚度（0~2km）、SO₂（边界层以内）柱浓度时空演变特征.结果表明，近10a来北京地区O₃浓度总体呈现上升趋势，最低值在2007年，浓度为33.65 μg/m³；硫酸盐气溶胶污染总体变化呈现先下降后增长的趋势，2007年硫酸盐气溶胶污染最为严重，2011年污染最轻，对应的AOD值为0.252，但在2014年以后，硫酸盐气溶胶污染又出现增长趋势；SO₂浓度在2007~2016年总体呈现下降的变化趋势，且下降趋势明显，最高值为2007年，最低值出现在2016年，最低值比最高值降低了60.42%，但在2011年污染出现反弹.北京O₃季节变化明显，夏季高、春秋次之、冬季低；硫酸盐气溶胶污染季节特征与O₃相同；SO₂污染主要集中在冬季，采暖期污染程度高于非采暖期.

The temporal and spatial distribution characteristics of the lower tropospheric ozone and sulfate aerosols in Beijing

Based on the OMI/Aura satellite data from 2007 to 2016, the temporal and spatial distribution characteristics of ozone (O₃) concentrations (0~3km), sulfate aerosol optical depth (SAOD) (0~2km) and sulfur dioxide (SO₂) (within the boundary layer) column concentrations in Beijing were analyzed. The results showed an upward trend in the past 10years with the minimum ozone concentration in 2007 (33.65μg/m³). The values of SAOD decreased from 2007 to 2011 and increased from 2011 to 2016, with a maximum and minimum annual average in 2017 (0.357) and 2011 (0.252), respectively. The concentrations of SO₂ decreased from 2007 to 2016 and decreased after 2011. The lowest annual average concentration of SO₂ was in 2016, which was 60.42% lower than the highest annual average concentration in 2007. The concentrations of O₃ was highest in summer, followed by spring and autumn, and lowest in winter. The seasonal characteristics of SAOD were the same as O₃. SO₂ occurred most frequently in winter, resulting in the more severe pollution in heating period than in non-heating period.