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| Studying on spatial and temporal distribution of absorbent aerosols and its influencing factors in Ningxia |
| ZHANG Guo-qiang1, JU Tian-zhen1, WANG Qin-hua2, LI Feng-shuai1, ZHANG Yong-jia1, MA chao1 |
1. College of Geography and Environmental Sciences, Northwest Normal University, Lanzhou 730070, China;
2. Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730070, China |
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Abstract Based on the daily OMI Level-2data products from 2008 to 2017, the spatial and temporal distribution characteristics of the Ultraviolet Aerosol Index (UVAI) in Ningxia Hui Autonomous Region were studied, and the correlation analysis and redundancy analysis of its environmental factors were performed. The results showed that the spatial pattern of UVAIwas gradually decreased from the northwest to the southeast of Ningxia Hui Autonomous Region in past decade, and the high UVAI regions were distributed throughout Zhongwei City, and most of Wuzhong City, Yinchuan City, and Shizuishan City. The monthly variation ofUVAI presented a "V" shape in each year. The characteristics of the four seasons were winter > autumn > spring > summer. In 2013, UVAI abruptly changed from a low value to a high, andit reached the highest in 2017. Theil-Sen Median trend analysis and Mann-Kendall test results showed that seasonal variation was no significant decrease in spring, no significant increase in summer, however, it showed a significantor extremely significant increase in autumn and winter. Otherwise, the study analyzed the trends and found that the concentration of absorptive aerosols was increasing year by year in Ningxia Hui Autonomous Region, and UVAI increased in different degrees in the five cities. The stability of the UVAI variation gradually decreased from Zhongwei City to the north and south with a significant difference in height,the coefficient of variation ranged from 0.293 to 0.442. Among the influencing factors, temperature hadthe greatest impact on the survival time of high aerosol air masses, the energy consumption structure, the total industrial value, and the secondary industry (industrial, construction industry) had a important impact on the generation of aerosols, followed by the impact of precipitation. The average wind speed and maximum wind speed showed a significant negative correlation with the residence time of the upper aerosol air mass in Ningxia Hui Autonomous Region.
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Received: 21 November 2019
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