Publications related to the GRACE Missions (no abstracts)

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Runoff Dynamics and Its Regime Changes in the Major River Basins of Africa From GRACE and GRACE-FO Observations

Elameen, Ayman M., Jin, Shuanggen, and Sarfo, Isaac, 2025. Runoff Dynamics and Its Regime Changes in the Major River Basins of Africa From GRACE and GRACE-FO Observations. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 18:22891–22926, doi:10.1109/JSTARS.2025.3601672.

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@ARTICLE{2025IJSTA..1822891E,
       author = {{Elameen}, Ayman M. and {Jin}, Shuanggen and {Sarfo}, Isaac},
        title = "{Runoff Dynamics and Its Regime Changes in the Major River Basins of Africa From GRACE and GRACE-FO Observations}",
      journal = {IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing},
     keywords = {Africa, climate change, gravity recovery and climate experiment (GRACE)/GRACE follow-on (GRACE-FO), major river basins, runoff},
         year = 2025,
        month = jan,
       volume = {18},
        pages = {22891-22926},
     abstract = "{The major African basins supply freshwater to around 0.5 billion people,
        while monitoring runoff fluctuations in these basins is still
        challenging due to limited in-situ data and high costs.
        Hydrologic models are widely used for this purpose, but they
        have certain drawbacks with larger uncertainty and low accuracy
        in poorly gauged basins. This study attempts to address this
        issue by using Gravity Recovery and Climate Experiment
        (GRACE)/GRACE Follow-On (GRACE-FO) satellite measurements and
        remote sensing data to estimate runoff changes in five major
        African basins from 2003 to 2019. Moreover, a comprehensive
        framework was developed to quantify interannual and intraannual
        runoff regimes and their changes from the perspectives of
        magnitude, variability, and duration. Results showed that runoff
        changes estimated from GRACE/GRACE-FO in the major African
        basins were in good alignment with those from the Global Land
        Data Assimilation System, European Centre for Medium-Range
        Weather Forecasts Reanalysis 5, and Soil Conservation Service-
        Curve Number. Seasonal runoff increased in the Nile (0.12 to
        0.46 mm/a, p < 0.05) and Congo (0.52 to 0.76 mm/a, p < 0.05)
        basins during 20032019, while it was decreased in the Zambezi (1
        to 0.34 mm/a, p < 0.05) and Orange (0.54 to 0.24 mm/a, p < 0.05)
        basins during the same period. Further in-depth analysis showed
        that the impacts of climate change in the study area were the
        primary contributors to changes in runoff. Monthly runoff in the
        Nile, Congo, and Niger basins showed an increase in magnitude,
        duration, and variability. In contrast, the Zambezi and Orange
        basins experienced a decrease in runoff magnitude, along with
        reduced variability and duration. In addition, large-scale
        atmospheric circulations, such as El-Nino Southern Oscillation
        Index and Indian Ocean Dipole, have been found to be associated
        with changes in runoff within the study area, as demonstrated by
        correlation and wavelet analysis. Our findings provided valuable
        insights into long-term runoff changes in major African basins
        and enhanced the understanding of hydrologic processes in poorly
        gauged regions.}",
          doi = {10.1109/JSTARS.2025.3601672},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2025IJSTA..1822891E},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

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