Seminar: Jiaxin Xie

Institutsseminar

  • Date: Apr 4, 2024
  • Time: 02:00 PM (Local Time Germany)
  • Speaker: Jiaxin Xie
  • (Reichstein department)
  • Room: Hörsaal (C0.001)
Large global groundwater recharge inferred from streamflow observations
The proportion of streamflow that comes from groundwater remains highly uncertain. Previous estimates of this proportion were 86% (land surface model) or less than 28% (latest IPCC report). We compiled daily streamflow observations in 15,567 global watersheds to derive a bottom-up estimate of this proportion. Implications for groundwater simulation are as follows:
  • Groundwater sustains 59% ± 7% of global streamflow, narrowing the wide range of Earth system model simulations (12% to 94%).
  • At least 21% ± 3% of precipitation recharges groundwater, which is twice the recharge rate estimated in the IPCC AR6 report, suggesting a much more active role of groundwater in the water cycle than most models and global water cycle diagrams currently present.
  • Soil emerges as the largest contributor to observational spatial variations in streamflow proportions from groundwater, while most Earth system models identify precipitation as the primary driver.
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