Zhang Zhe, Ding Jian-Li, Wang Jin-Jie, Chen Xiang-Yue, Liu Xing-Tao, Atican Osman
Geography Postdoctoral Research Station, Xinjiang University, Urumqi 830046, China.
Key Laboratory of Smart City and Environment Modelling of Higher Education Institute, College of Resources and Environment Science, Xinjiang University, Urumqi 830046, China.
Huan Jing Ke Xue. 2021 May 8;42(5):2202-2212. doi: 10.13227/j.hjkx.202009083.
In order to explore the temporal and spatial distribution characteristics of atmospheric aerosol optical depth (AOD) in the urban agglomeration on the northern slope of the Tianshan Mountains, the temporal and spatial distribution characteristics and trends of changes in the AOD in the study area from 2000 to 2019 were analyzed by MODIS aerosol products(MCD19-A2). For 2016-2019, when the AOD was relatively stable, the parameters such as the AOD and Ångström wavelength index () were analyzed using multi-band sun photometer ground-based remote sensing technology. The results showed that ① the spatial distribution of AOD in the study area was consistent with the topography, and high values were mainly distributed in the low altitude area. The spatial distribution of AOD in the four seasons showed a strong seasonal change from spring (0.15±0.03) > autumn (0.14±0.03) > summer (0.14±0.02). ② In terms of time, the annual average AOD value of the study area was 0.12 from 2000 to 2019 with an annual growth rate of 1.03%, thereby showing an overall increasing trend. The annual variation in the monthly mean value of AOD was bimodal; the first and second peaks were in May and November. The main reason for the increase in AOD was the release and transmission of dust from natural sources and heating. ③ Under the influence of dust weather, the AOD changed sharply in spring, and the size and change range of aerosol particles were larger than those in summer. The high value of AOD in the study area was mainly affected by coarse mode particles. The moisture absorption growth of fine mode particles caused a fluctuation in the AOD, but it was not the cause of the high value of AOD.
为探究天山北坡城市群大气气溶胶光学厚度（AOD）的时空分布特征，利用中分辨率成像光谱仪（MODIS）气溶胶产品（MCD19 - A2）分析了2000—2019年研究区域AOD的时空分布特征及变化趋势。对于2016—2019年AOD相对稳定期间，利用多波段太阳光度计地基遥感技术分析了AOD和Ångström波长指数（ ）等参数。结果表明：①研究区域AOD的空间分布与地形一致，高值主要分布在低海拔区域。四季AOD的空间分布呈现出较强的季节变化，春季（0.15±0.03）>秋季（0.14±0.03）>夏季（0.14±0.02）。②从时间上看，2000—2019年研究区域年平均AOD值为0.12，年增长率为1.03%，呈整体上升趋势。AOD月均值的年变化呈双峰型；第一和第二峰值分别出现在5月和11月。AOD增加的主要原因是自然源沙尘的释放与传输以及供暖。③在沙尘天气影响下，春季AOD变化剧烈，气溶胶颗粒的粒径和变化范围均大于夏季。研究区域AOD高值主要受粗模态颗粒影响。细模态颗粒的吸湿增长导致AOD出现波动，但并非AOD高值的成因。
