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Increasing seasonal variation in the extent of rivers and lakes from 1984 to 2022

Hydrology and Earth System Sciences, ISSN: 1607-7938, Vol: 28, Issue: 7, Page: 1653-1663
2024
  • 0
    Citations
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    Usage
  • 20
    Captures
  • 1
    Mentions
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    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Captures
    20
  • Mentions
    1
    • News Mentions
      1
      • News
        1

Most Recent News

Study Findings on Hydrology and Earth System Sciences Reported by Researchers at University of Bergen (Increasing seasonal variation in the extent of rivers and lakes from 1984 to 2022)

2024 APR 30 (NewsRx) -- By a News Reporter-Staff News Editor at NewsRx Science Daily -- New study results on hydrology and earth system sciences

Article Description

Knowledge of the spatial and temporal distribution of surface water is important for water resource management, flood risk assessment, monitoring ecosystem health, constraining estimates of biogeochemical cycles and understanding our climate. While global-scale spatiotemporal change detection of surface water has significantly improved in recent years due to planetary-scale remote sensing and computing, it has remained challenging to distinguish the changing characteristics of rivers and lakes. Here we analyze the spatial extent of permanent and seasonal rivers and lakes globally over the past 38 years based on new data of river system extents and surface water trends. Results show that while the total permanent surface area of both rivers and lakes has remained relatively constant, the areas with intermittent seasonal coverage have increased by 12% and 27% for rivers and lakes, respectively. The increase is statistically significant in over 84% of global water catchments based on Spearman's rank correlations (rho) above 0.05 and p values less than 0.05. The seasonal river extent is nearly 32% larger than the previously observed annual mean river extent, suggesting large seasonal variations that impact not only ecosystem health but also estimations of terrestrial biogeochemical cycles of carbon. The outcomes of our analysis are shared as the Surface Area of Rivers and Lakes (SARL) database, serving as a valuable resource for monitoring and research of hydrological cycles, ecosystem accounting, and water management.

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