Controlled and driving mechanism of the SPM variation of shallow Brackish Lakes in arid regions

Changjiang LIU, Fei ZHANG, Chi Yung JIM, Verner Carl JOHNSON, Mou Leong TAN, Jingchao SHI, Xingwen LIN

Research output: Contribution to journalArticlespeer-review

4 Citations (Scopus)

Abstract

Suspended particulate matter (SPM) in the brackish Ebinur Lake of arid northwest China profoundly affect its water quality and watershed habitat quality. However, the actual driving mechanisms of the Lake's SPM changes remain unclear. Therefore, the purpose of this study is to explore the controlling factors driving the variability of SPM in the Ebinur Lake. This study constructed month-by-month SPM maps of Ebinur Lake based on time-series remote-sensing imageries and SPM inversion model. Thirty-four factors that might influence SPM changes were extracted, and the Partial Least Squares Structural Equation Modeling (PLS-SEM), suitable for complex relationships and factor interactions, was applied to identify the relative influence of each factor quantitatively. The results showed: (1) a clear increasing trend of SPM concentration in Ebinur Lake from 2011 to 2020; (2) that SPM changes were influenced by external and internal factors, explaining 48.2 % and 46.9 % of the changes, respectively; (3) that, to the external factors, meteorological factors exerted the greatest influence on SPM (relative contribution of 38.9 %); that, to the internal factors, water salinity imposed the greatest influence on SPM (relative contribution of 43.3 %); (4) that, among the meteorological factors, the measured variable Alashankou wind speed expressed the most significant positive effect on SPM (weighting coefficient of 0.894), and sulfate generated the strongest positive effect on SPM (weighting coefficient of 0.791) among the water salinity factors. Hence, the quantitative identification of drivers of SPM changes in Ebinur Lake could provide a new perspective to investigate the driving mechanisms of lake water quality in arid areas and inform their sustainable restoration and management. Copyright © 2023 Elsevier B.V. All rights reserved.
Original languageEnglish
Article number163127
JournalScience of the Total Environment
Volume878
Early online dateMar 2023
DOIs
Publication statusPublished - Jun 2023

Citation

Liu, C., Zhang, F., Jim, C.-Y., Johnson, V. C., Tan, M. L., Shi, J., & Lin, X. (2023). Controlled and driving mechanism of the SPM variation of shallow Brackish Lakes in arid regions. Science of The Total Environment, 878. Retrieved from https://doi.org/10.1016/j.scitotenv.2023.163127

Keywords

  • Arid region
  • Brackish lake
  • Suspended particulate matter
  • Water quality
  • Driving factors
  • Structural equation modeling

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