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| Absorption aerosol in Gansu Province based on satellite remote sensing |
| LI Feng-shuai, JU Tian-zhen, MA Chao, XIAN Long |
| Geographical and Environmental Department, Northwest Normal University, Lanzhou 730070, China |
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Abstract Based on the OMAERUV data daily product, the spatial and temporal distribution of the ultraviolet aerosol index (UVAI) in Gansu Province from 2008 to 2017 was analyzed, and the related factors were discussed. The results showed that the spatial pattern of UVAI nearly 10 years in the province gradually decreased from northwest to southeast region. The high value area of UVAI distributed in Jiuquan City and its neighboring areas, which was the center of absorbent aerosol pollution. The stability of UVAI in Gansu Province gradually decreased from northeast to southwest region. The monthly average value of UVAI showed an obvious regularity, and the monthly change of UVAI showed a "V" pattern every year; the UVAI level of four seasons was:winter > spring > autumn > summer, the seasons were basically synchronized, the UVAI of the four seasons had risen gradually during past ten years, and the sources of the absorbed aerosol dominated in four seasons were different. The analysis of air quality level Based on UVAI of PM2.5 indicated that the air quality in Gansu Province was mainly good; From the analysis of correlation between meteorological factors and UVAI, precipitation, temperature showed a significant positive correlation to UVAI, and the wind direction also had an important impact on its spatial distribution; the areas where the main distribution of vegetation coverage and UVAI was positively correlated distributed in the northwestern of Gansu Province and the center of Wuwei City, the areas where the main distribution of vegetation coverage and UVAI was negatively correlated distributed in Tianshui and Longnan in the south of Gansu Province, which had a higher vegetation coverage.From the point of the correlation between human activity factors and UVAI, regional GDP, industrial output value and UVAI had a significant positive correlation, especially the secondary industry and UVAI had the highest relevance; UVAI had a strong positive correlation with car ownership, total energy consumption and population density, which indicated that automobile exhaust, industrial emissions and construction dust were important source of absorbing aerosol. Based on the spatial and temporal distribution characteristics of UVAI and the analysis of natural and human activities in Gansu Province, some suggestions of reducing the intensity of human activities were proposed.
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Received: 18 March 2019
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