Zhao Shi-Wei, Gao Xiao-Qing
Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions, Chinese Academy of Sciences, Lanzhou 730000, China.
Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China.
Huan Jing Ke Xue. 2017 Jul 8;38(7):2637-2646. doi: 10.13227/j.hjkx.201611164.
This work compared the collection 6 MODIS aerosol optical depth products with sun photometer data from AERONET, and evaluated the applicability of C6 merged data in the northwest of China. The spatio-temporal variation characteristics and influencing factors of AOD over northwest of China were analyzed by MODIS/AQUA C6 MYD08-M3 products from 2006 to 2015, and the results showed that Southern Xinjiang and Guanzhong region of Shanxi province had relatively high AOD, whereas the south of Qinghai and Gansu province had low values; Junggar Basin was the incremental area of AOD for the first 5 years and second 5 years, whereas converse result existed in Qaidam Basin and Hetao area. Temporally, the yearly mean AOD ranged from 0.18 to 0.22, and the declined trend occurred in 2011, and the annual decrease rate was about 0.32%; Because of different intensity and frequency of dust weather, the south of Xinjiang showed a significant interannual variation characteristic; East of the northwest displayed an obviously declining trend from 2011 to 2015, and the yearly mean decrease was about 1.1%. The AOD in north of Xinjiang and Qinghai-Tibet remained stable. The seasonal changes of AOD among different areas over the northwest had the same trend, all gradually declined from spring to autumn, and increased in winter.
本研究将6个MODIS气溶胶光学厚度产品与AERONET太阳光度计数据进行了对比，并评估了C6合并数据在中国西北地区的适用性。利用2006—2015年MODIS/AQUA C6 MYD08-M3产品分析了中国西北地区气溶胶光学厚度（AOD）的时空变化特征及影响因素，结果表明：新疆南部和陕西关中地区AOD相对较高，青海和甘肃南部较低；准噶尔盆地在前5年和后5年是AOD增加区域，而柴达木盆地和河套地区则相反。从时间上看，年平均AOD在0.18至0.22之间，2011年呈下降趋势，年下降率约为0.32%；由于沙尘天气强度和频次不同，新疆南部呈现出明显的年际变化特征；西北地区东部在2011—2015年呈明显下降趋势，年平均下降约1.1%。新疆北部和青藏高原地区的AOD保持稳定。中国西北地区不同区域AOD的季节变化趋势一致，均从春季到秋季逐渐下降，冬季增加。
