Water vapor in the atmosphere has a major effect on the quality of the observations in various spectral regions of the near- and mid-infrared. This page summarizes the measurements obtained at Paranal.
The method used to obtain the following measurements is described in Measuring the amount of precipitable water vapour with VISIR by Smette, A., Horst, H., Navarrete, J. 2007,Proceedings of the 2007 ESO Instrument Calibration Workshop,Springer-Verlag series "ESO Astrophysics Symposia", eds. F. Kerber & A. Kaufer.A paper is in preparation. Interested people should contact Alain Smette.