Spatio-temporal Heterogeneity and Driving Factors of AOD in the Yellow River Basin

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Spatio-temporal Heterogeneity and Driving Factors of AOD in the Yellow River Basin

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[1]LI Jian,QUAN Zhiwen,ZHOU Shugui,et al.Spatio-temporal Heterogeneity and Driving Factors of AOD in the Yellow River Basin[J].Journal of Zhengzhou University (Engineering Science),2024,45(03):29-37.[doi:10. 13705 / j. issn. 1671-6833. 2024. 03. 014]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 45 Number of periods: 2024 03 Page number: 29-37 Column: Public date: 2024-04-20

Title:: Spatio-temporal Heterogeneity and Driving Factors of AOD in the Yellow River Basin

Author(s):: LI Jian ¹; QUAN Zhiwen ²; ZHOU Shugui ¹; MA Yurong ²; 3; 1. School of Geo-Science & Technology, Zhengzhou University, Zhengzhou 450001, China; 2. School of Water Conservancy and Transportation, Zhengzhou University, Zhengzhou 450001, China; 3. Library, Zhengzhou University, Zhengzhou 450001, China

Keywords:: MODIS; AOD; spatio-temporal pattern; influencing factors; the Yellow River Basin

CLC:: X513

DOI:: 10. 13705 / j. issn. 1671-6833. 2024. 03. 014

Abstract:: Studies on the long-term aerosol optical depth ( AOD) based on the large-scale Yellow River basin was limited, and most of them only focused on meteorological conditions. In this study, the MODIS aerosol optical depth ( AOD) products was collected, and then the temporal and spatial pattern of AOD and comprehensively quantified the impact of geographical environment, natural weather and social economy on AOD in the Yellow River Basin were analyzed based on the geographically weighted regression (GWR) . The results showed that the AOD exhibited a downward trend in the Yellow River Basin. The AOD value decreased from 0. 38 in 2001 to 0. 22 in 2022. Moreover, the distribution of AOD also showed obvious seasonal differences that AOD values in spring and summer were higher than in autumn and winter. This wight be the result of a combination of factors such as temperature, atmospheric diffusion conditions, and vegetation cover. From the perspective of spatial distribution, the AOD in the study area gradually increased from west to east. This trend was opposite to the distribution of DEM in the Yellow River Basin, indicating a close correlation between terrain and aerosols. The analysis of influencing factors based on GWR model showed that, for the entire Yellow River Basin, terrain and vegetation had the greatest impact on AOD in the Yellow River Basin, followed by socio-economic factors and natural meteorology. Prominent cities in the Yellow River Basin were also analyzed in the study, and the results showed that the inter-annual variation of AOD in different cities in the study area was quite different. The AOD values of Xining, Yinchuan and Baotou in the upper reaches of the Yellow River Basin showed a low level, with the highest value appearing in winter and the lowest value appearing in summer, while the AOD values of cities in the middle and lower reaches were the highest in summer and the lowest in winter.

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Last Update: 2024-04-29