This PDF file includes:

• note S1. Site description.
  
• note S2. Supplementary methods.
  
• note S3. Wind direction and speed measurements.
  
• table S1. Isotopic composition and d-excess of individual precipitation events captured during 2014–2015.
  
• table S2. Isotopic composition and classification of individual fog, dew, groundwater, and river samples captured between 2014 and 2015.
  
• table S3. Monthly rainfall that could have influenced fog and dew formation at the Gobabeb Research and Training Centre during the observation period.
  
• fig. S1. Hybrid Single-Particle Lagrangian Integrated Trajectory model (60) of 48-hour backward trajectory analysis of the five precipitation events captured at the Gobabeb Research and Training Centre during the observation period.
  
• References (61–66)

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