2000—2019年东北三省气溶胶光学厚度的时空分布特征

利用MODIS高时空分辨率(日; 1 km×1 km)气溶胶光学厚度新产品MCD19A2, 研究东北三省2000—2019年气溶胶光学厚度(AOD)的时空分布特征。结果显示, 东北三省近20年来AOD变化不大, 均值为0.23。2003年, 春旱、扬沙和农田秸秆燃烧导致AOD最高(0.38)。AOD从南往北呈递减趋势, 总体上辽宁省>吉林省>黑龙江省。AOD高值区集中在辽中南城市群等人口密集的工业发达地区, 低值区分布在大兴安岭、小兴安岭和长白山脉等山区。AOD具有季节分布特征, 春夏季高, 秋冬季低。研究结果可为气溶胶对大气辐射收支平衡影响的研究以及模拟颗粒物浓度提供基础。

Spatial-temporal Distribution of Aerosol Optical Depthover Northeastern China During 2000?2019

Using MCD19A2, a new product of MODIS with high temporal and spatial resolution(daily; 1 km × 1 km), spatial-temporal distribution of aerosol optical depth (AOD) over northeastern China during 2000?2019 were studied and analyzed. The results showed that the average AOD of the northeastern China in recent 20 years is 0.23, and have changed little. 2003 is the year with the highest AOD (0.38), which is mainly affected by spring drought, sand blowing, straw burning and other factors. In terms of spatial distribution, there is a decreasing trend from south to north. Liaoning province is higher than Jilin province and Jilin province is higher than Heilongjiang Province. AOD high-value areas are concentrated in the urban agglomeration of south-central region of Liaoning Province and other areas with dense population and developed industry. Low-value area is distributed in the greater Hinggan Mountains, lesser Hinggan Mountains, Changbai Mountains and other mountainous areas. Seasonal distribution of AOD; Higher in spring and summer, lower in autumn and winter. The results can be used to study the effects of aerosols on the atmospheric radiation balance or to simulate the concentration of particulate matter.