- One type of measurement is based on the measurement of the solar irradiance on two wavelengths, one in a water absorption band, and the other not. The precipitable water column is determined using the irradiances in these bands and the Beer-Lambert law.
- Data can be viewed on a Lifted-K index. The numbers represent inches of water as mentioned above for a geographical location.
Comparison of precipitable water observations in the near tropics by GPS, microwave radiometer, and radiosondes
Jan 01, 2001; ABSTRACT The sensing of precipitable water (PW) using the Global Positioning System (GPS) in the near Tropics is investigated....