Faculty of Geomatics, Lanzhou Jiaotong University, Lanzhou, 730070, China.
Gansu Provincial Engineering Laboratory for National Geographic State Monitoring, Lanzhou, 730070, China.
Environ Sci Pollut Res Int. 2020 Jul;27(21):26579-26593. doi: 10.1007/s11356-020-09000-y. Epub 2020 May 5.
The rapid pace of economic growth and urbanization in China affects both large and small cities of the country, causing an increase of pollutant concentrations in the air. The South Gobi is one of the main deserts and semidesert regions of the country; therefore, the study of air pollution near the potential source of natural aerosols is of great importance. Data obtained in the period from 1 January 2016 to 31 December 2019 was used to analyze spatial-temporal characteristics of atmospheric pollutants (PM, PM, SO, NO, and CO) in eight cities. Total mean concentrations of PM and PM were 36.1 ± 21.1 μg/m and 98.6 ± 108.7 μg/m. The occurrence rates of concentrations exceeding the Chinese National Ambient Air Quality Standard (CNAAQS) grade 1 and grade 2 were 40.1% and 5.4% for PM and 82.9% and 11.64% for PM in the region. Total concentrations of SO, NO, and CO did not exceed the CNAAQS standard and were 20.8 ± 23.6 μg/m, 22.6 ± 11.9 μg/m, and 0.72 ± 0.39 mg/m, respectively. The PM to PM ratio increased from 0.35 in spring to 0.46 in winter suggesting the predominance of coarse aerosol fractions in the atmosphere. Based on data on aerosol optical depth (AOD) and Ångström exponent (AE) ratio obtained from Moderate Resolution Imaging Spectroradiometer (MODIS), the predominant aerosol types in the region are Clean Сontinental and Mixed. Maximum concentrations of pollutants and the highest AOD values in the region air are observed in spring and winter. Results set forth in this article will be an important basis for further regional studies on air quality and distribution of sources.
中国经济增长和城市化的快速发展影响着该国的大小城市，导致空气中污染物浓度增加。南戈壁是该国主要的沙漠和半沙漠地区之一；因此，研究潜在自然气溶胶源附近的空气污染具有重要意义。本研究使用 2016 年 1 月 1 日至 2019 年 12 月 31 日期间的数据，分析了八个城市大气污染物（PM、PM、SO、NO 和 CO）的时空特征。PM 和 PM 的总平均浓度分别为 36.1±21.1μg/m 和 98.6±108.7μg/m。PM 和 PM 浓度超过中国国家环境空气质量标准（CNAAQS）一级和二级标准的发生率分别为 40.1%和 5.4%和 82.9%和 11.64%。SO、NO 和 CO 的总浓度未超过 CNAAQS 标准，分别为 20.8±23.6μg/m、22.6±11.9μg/m 和 0.72±0.39mg/m。PM/PM 比值从春季的 0.35 增加到冬季的 0.46，表明大气中粗气溶胶分数占主导地位。基于中分辨率成像光谱仪（MODIS）获得的气溶胶光学深度（AOD）和 Ångström 指数（AE）比值的数据，该地区主要的气溶胶类型为清洁大陆和混合。污染物浓度和 AOD 值的最大值出现在春季和冬季。本文的研究结果将为进一步开展空气质量和污染源分布的区域研究提供重要依据。
